Douglas A. Munro Coast Guard Headquarters Boasts One of World’s Largest Green Roofs

The Douglas A. Munro Coast Guard Headquarters Building in Washington, D.C., has more than 550,000 square feet of green roof space. Photos: Owens Corning

Like a 550,000-square-foot sponge, the vegetative roof assembly (VRA) atop the Douglas A. Munro Coast Guard Headquarters Building in Washington, D.C., absorbs rainfall while managing its release into the city’s sewer system. Green roofs are a storm water management “best practice” in the nation’s capital, which boasts more than 3.2 million square feet of green roof space.

Gordon Contractors installed the green roof on the 11-level, 1.2-million-square-foot headquarters, which is also home to several independent field commands including the National Pollution Fund Center and Marine Safety Center. Key performance objectives included complying with D.C.’s stringent storm water regulations, as well as federal Environmental Protection Agency (EPA) rules requiring 95 percent of storm water to be collected onsite.

Beyond complying with local and federal storm water mandates, the project team creating the vegetative roof sought to create a rooftop habitat that supports biodiversity and helps birds and other wildlife thrive. The result of a careful and collaborative approach to moisture management is a high-performing roof that ultimately received LEED Gold certification from the U.S. Green Building Council. Working as a system, the roof’s components help reduce rainwater runoff while helping to reduce pollutant loads and protect natural resources such as the nearby Chesapeake Bay.

Numerous Challenges

As every roofer knows, no two projects are alike. The location of the Douglas A. Munro Coast Guard Headquarters on hilly terrain provided plenty of natural obstacles, including nine of the eleven levels being built into a hillside. The site

Gordon Contractors installed the green roof on the 11-level headquarters. Performance objectives included complying with D.C.’s stringent storm water regulations, as well as federal EPA rules requiring 95 percent of storm water to be collected onsite. Photos: Owens Corning

features a series of stair-stepped green roof terraces that help gradually move water from higher to lower levels and eventually into a pond through elevation changes of 120 feet. According to Steve Gordon, president of Preservation & Protection Systems Inc. (PPSI), the company providing design and installation support with the Owens Corning FOAMULAR extruded polystyrene insulation and Henry 790-11 Hot Rubberized Asphalt used in the VRA, the stair-step design required a complex approach to the roof’s varied elevations. To meet this challenge a complex network of expansion joints by EMSEAL tied together multiple air barriers within the system. Another challenge was the magnitude of the project, spanning more than a half-million feet across multiple levels and 176 acres. Timing was critical, as plants and vegetation required quick delivery and transplanting into their new environment, particularly during D.C.’s sweltering summers. These living materials couldn’t simply be covered with a tarp until better conditions prevailed, but had to be quickly transported, installed and irrigated.

The Douglas A. Munro Coast Guard Headquarters serves 4,000 occupants, so comfort and energy efficiency were important concerns. From the outset of the project, the integrated roofing team was tasked with designing a vegetative roof assembly that would help decrease the building’s heating and cooling energy usage, lower long-term maintenance costs and extend the life of the roof.

A Solution to Achieve Performance Goals

The project team selected a Protected Roof Membrane Assembly (PRMA) to deliver the water management required to meet storm water mandates, as well as deliver energy efficiency through R-value performance and strength to support vegetation requirements. The PRMA places the insulation layer above the waterproofing membrane, a reversal of traditional roof systems. PPSI recommended Owens Corning FOAMULAR 404 and 604 extruded polystyrene (XPS) insulations for use in the PRMA. The water resistance and compressive strength of the XPS insulation provided the integrity needed for long-term roof performance and helped the Douglas A. Munro Coast Guard Headquarters Building ultimately achieve LEED Gold certification.

The Douglas A. Munro Coast Guard Headquarters was built on hilly terrain, and nine of the eleven levels were built into a hillside. The stair-stepped green roof terraces help gradually move water from higher to lower levels and eventually into a pond. Photos: Owens Corning

Given the sheer size of the project, it was inevitable that the roofing team would encounter several scenarios requiring strategic problem-solving throughout the installation. For example, the team adjustedthe engineered soil specification to reduce the loads within the structural tolerances for the roof structure and carefully addressed a range of pH, moisture, organic matter and nutrient levels to support the variety of plants. Not only did such careful attention deliver strength performance, it’s also achieved the objective of attracting wildlife. The terraced landscape has welcomed not only birds and butterflies, but the occasional deer wandering onto a rooftop.

Evaluating Results

Since its completion, the VRA at the Douglas A. Munro Coast Guard Headquarters has attracted widespread attention from landscaping groups, engineering firms and organizations interested in sustainability. These groups are interested not just in the building’s unique design but in its resilience and performance. Steve Gordon of PPSI says the resilience of the headquarters’ roof is reflected in its record of no leaks. “We’ve had no leaks,” Gordon says. “The reason we use hot fluid applied waterproofing on green roofs is because we want to avoid any leaks in the building. At the end of the day, the biggest liability in a roof is water.”

After successfully navigating a range of challenges and opportunities, the U.S. Coast Guard Headquarters’ VRA epitomizes the convergence of aesthetics and performance and is recognizedas one of the largest green roofs in the world.According to the Landscape Performance Foundation, the headquarters’ vegetative roof retains up to 424,000 gallons of rainwater.

In a small way, the performance reflects the integrity of a hero an Act of Congress honored when naming the headquarters, according to Captain Will Smith, Commanding Officer U.S. Coast Guard Base NCR. Captain Smith noted, “The Coast Guard’s only Medal of Honor recipient, Douglas Munro earned the award for his selfless sacrifice as a landing craft pilot at Guadalcanal while evacuating marines from a beachhead under heavy fire from enemy forces.”

TEAM

Architect: WDG, Washington, D.C., www.wdgarch.com
General Contractor: Clark Construction Group, Bethesda, Maryland, www.clarkconstruction.com
Roofing Contractor: Gordon Contractors, Capitol Heights, Maryland, www.gordoncontractors.com
Independent Rep Agency: Preservation & Protection Systems Inc. (PPSI), Laurel, Maryland, www.ppsimd.com

MATERIALS

Insulation: FOAMULAR 404 and 604 extruded polystyrene, Owens Corning, www.owenscorning.com
Waterproofing Membrane: 790-11 Hot Rubberized Asphalt, Henry Company, https://us.henry.com
Expansion Joints: EMSEAL, www.emseal.com
Pavers: Hanover Architectural Products, www.hanoverpavers.com
Sedum Mats: Sempergreen, www.sempergreen.com

The Hatch Memorial Shell Shows Off New Roof at 4th of July Celebration

The Boston Pops perform at The Hatch Memorial Shell on July 4, 2018. Photo: Walter Mulligan Photography

The Boston Pops perform at The Hatch Memorial Shell on July 4, 2018. Photo: Walter Mulligan Photography

In an annual tradition, Boston kicks off its outdoor summer concert series with a nationally televised performance by The Boston Pops Orchestra on the 4thof July while fireworks snap and sparkle. The Pops perform from The Hatch Memorial Shell, an amphitheater shaped like the quarter of an orange that opens to the crowd on the Charles River Esplanade.

The difficulty of waterproofing this curved structure became apparent after the Massachusetts Department of Conservation & Recreation (DCR), owner and manager of the Hatch Shell put out a bid for a new roof around Labor Day in 2017. The specification called for a single-ply EPDM sheet with pre-cast concrete panels set atop pedestals as an aesthetic outer shell.

Folan Waterproofing & Construction Co. Inc. of South Easton, Massachusetts, the general contractor, handled the overall project as well as demolition of an old terrazzo roof and installation of the new pre-cast concrete panels. Executive manager Patrick Folan worked closely with roofing contractor John F. Shea Company of Mattapan, Massachusetts, which was responsible for the waterproofing installation.

Working from cloud point data, lasers marked the position of the 1,476 pedestals that would hold the 3-inch thick concrete panels in place on the curved structure. Photo: Kemper System America Inc.

Shea Company project manager Michael Frank, RRC, reviewed the installation challenges with Folan. The EPDM sheet would need to be cut into multiple slices, and then require full adhesion to the curved roof deck as well as along all the lap seams. The pedestals for the 665 concrete panels also posed an issue since the anchor studs would penetrate the EPDM sheet. There would be nearly 4,500 penetrations on the job for the 1,476 stainless steel pedestals alone. No EPDM manufacturer would warrant the installation.

After the contract was awarded in October 2017, the construction team suggested an alternative inspired by a recent project for a youth center in Cambridge. There Shea Company used the Kemperol 2K-PUR liquid-applied reinforced membrane system to waterproof below a plaza deck topped with pedestals and pavers. The DCR and Boston architectural firm Bargmann Hendrie + Archetype Inc. gave the team a green light to explore further.

“The point we made was that because we are dealing with such an odd shape and with so many penetrations for the studs, it would be much easier to install the Kemperol liquid-applied system,” Frank says. “With the single-ply EPDM sheet, there would be ‘miles’ of field seams and, of course, every time you have a lap joint, you have areas that may be suspect at some point for leaking.”

The team contacted Kemperol manufacturer, Kemper System America Inc. of West Seneca, New York, and detailed specifications for the assembly along with cost estimates were presented to the owner and architect about two weeks later. “Obviously, there was a change in installed cost, but it was almost immediately accepted. So, we needed to completely shift gears, and revise our shop drawings and submittals accordingly,” Frank says. Among other things, the design of the stainless steel pedestals was modified to allow the panels to rest a couple of inches above the new reinforced membrane.

Air hammers were used to remove the aging terrazzo and concrete layer. Photo: Kemper System America Inc.

The surface preparation for the waterproofing started in April 2018, with a late May project completion target. The Folan crew removed the old cast-in-place terrazzo roofing system with air hammers and then peeled back an existing neoprene membrane to expose the structural concrete deck. Before the waterproofing membrane could be applied, Folan completely tented the roof with winter enclosures around the scaffolding, and then added diesel heaters to maintain the temperature above 40 degrees F.

Shea Company worked the job across the top of the structure and down row-by-row. After applying a Kempertec EP primer, crews applied Kemperol 2K-PUR resin with high-nap rollers a section at a time while laying Kemperol reinforcement into the resin from 20-foot rolls. Each roll was pre-cut lengthwise and then rerolled so it could be smoothly laid onto the curved surface. This was closely followed by a topcoat of the resin to fully embed the reinforcement in the resin. The system fully adheres to the deck and creates a monolithic watertight surface.

Securing the Anchors

Each pedestal needed to be precisely positioned and anchored into place through the membrane, so the epoxy anchoring system for the studs was key to the project.

The team from John F. Shea Company waterproofed the concrete roof deck with a Kemperol liquid-applied reinforced membrane system. Photo: Kemper System America Inc.

The team from John F. Shea Company waterproofed the concrete roof deck with a Kemperol liquid-applied reinforced membrane system. Photo: Kemper System America Inc.

After the membrane fully cured, 3-D measurements were taken across the dome with point cloud software to help determine the height difference between the surface of the membrane and the desired finished elevation for the pre-cast panels. The surveying firm that made the measurements returned when it was time to set the pedestals.

“Their surveyors marked out the dome with lasers. They would set a mark, and say, ‘This is your point for four panels, and this is the cavity depth for the finished panel elevation,’” Folan explains. There was also GPR (Ground Penetrating Radar) scanning performed to locate existing reinforcement in the original structural concrete. His firm carefully drilled holes for the threaded studs to avoid the existing reinforcing steel, and the studs were then set in epoxy. Shea Company then applied GreatSeal PE-150 sealant around the pedestals and the heads of the bolts.

“Kemper System provided this detail, and they wanted the epoxy to ooze out of the pre-drilled holes when the anchors were inserted,” he says. “We would then hang the pedestals on the studs, and screw nuts onto the studs to hold the pedestal in place.”

The Folan team needed to wait for an architectural review of the pre-cast concrete panels before they could be installed. They were not all the same, but designed and numbered like puzzle pieces for their location on the shell. The 3-inch thick panels averaged 3 feet by 4 feet, and needed to be lowered by crane since they ranged from about 350 to 550 pounds each.

The studs for the pedestals were epoxied in place through the Kemperol membrane and top-sealed with GreatSeal construction sealant, also from Kemper System. Photo: Kemper System America Inc.

The panels were installed row-by-row starting at the bottom with 3/4-inch open joints between. “The biggest factor at that point was the depth of the cavity. Before we set a pedestal, we needed to know whether it should be shimmed 1/16th, 1/8th or 1/4 inch,” Folan says.

Though the panel fabrication process started late, the team worked six days a week with some 10-hour days to complete the job by a final June 15thdeadline. “As fast as they could get us the pre-cast panels, we were putting them in,” he recalls.

Looking back, Folan says the pedestals would have required much more time to install if the Kemperol system had not been selected, since there were nearly 1,500 of them and each would need to be covered with EPDM. “With the Kemper System detail, we could just keep moving to meet the deadline in time for the big July 4thcelebration.”

TEAM

Architect: Bargmann Hendrie + Archetype Inc., Boston, https://bhplus.com
General Contractor: Folan Waterproofing & Construction Co. Inc., South Easton, Massachusetts, www.folanwaterproofing.com
Roofing Contractor: John F. Shea Company of Mattapan, Massachusetts, www.johnfshea.com

MATERIALS

Liquid-Applied Waterproofing System: Kemperol 2K-PUR liquid-applied reinforced membrane system, Kemper System America Inc., West Seneca, New York, www.kemper-system.com

Recreation Center’s Innovative Roof and Wall Systems Provide Added Durability

Indian River County Intergenerational Recreation Center hosts recreational and competitive sporting events and other community activities. Photos: Borrelli + Partners

Indian River County Intergenerational Recreation Center was designed to be the hub of its community, a venue that hosts recreational and competitive sports and other activities, including educational, social and philanthropic events.

The new $10.4 million facility, branded by the county as the “iG Center” and often referred to as “Big Red,” consists of two adjoining main buildings: the two-story gymnasium and a long, single-story wing that houses various multi-purpose rooms, a concession area, a game room and a catering kitchen.

The site’s location near the oceanfront in Vero Beach, Florida, is susceptible to hurricanes and other extreme weather events, and making sure the complex would stand up to the elements was a key consideration for officials and residents in the county. This concern prompted a focus on the design of the building’s exterior envelope. In the end, a metal roof and metal wall panels were the key to meeting the building’s design goals.

Design Criteria

When county officials spoke with the architects at Borrelli + Partners, they had a strict set of criteria in mind for the building, including the ability to withstand high wind speeds and 100-year rainstorms. “They mandated a sloped roofing system,” notes Dan-Michael Trbovich of Borrelli + Partners. “They wanted a minimum 20-year warranty, and they said they were looking for a ‘50-year roof.’ This affected the roof design and the wall design.”

The new $10.4 million facility was designed to stand up to hurricanes, torrential rains and extreme fluctuations in temperature. Photos: Atlantic Roofing II of Vero Beach Inc.

A key goal of the team at Borrelli + Partners was to specify a watertight metal roof system that would also allow unlimited thermal movement to cope with extreme temperature fluctuations. They found what they were looking for in a standing seam metal roof and wall system manufactured by IMETCO.

The 37-acre site and open park setting also provided the opportunity to explore interesting aesthetic elements. The building would be highly visible, and goals included a dynamic exterior design that would allow the park and the building complement each other. In the end, the decision was made to go with bright red and white metal panels that would stand against the blue sky to create what Trbovich calls an “All-American design.”

In one of many daring design elements, sections of the red roof panels were folded over and brought down to the ground to serve as wall panels. A custom detail was devised to make the transition impervious to water penetration.

“Our criteria included a kneecap—a premanufactured fixture that would be put over the entire thing,” Trbovich says. “IMETCO was the only manufacturer we knew that offered that, and it was absolutely critical in the design.”

Areas in which the panels were turned over included the south-facing wall, which was no coincidence. “We wanted to make sure the south-facing wall didn’t get too much heat, so what you’re essentially doing is creating a vented roof decking system that protects the vertical surface on the south side,” notes Trbovich.

High summer temperatures and afternoon rains in Vero Beach can cause a lot of expansion and contraction, so HVAC and plumbing systems were rerouted to avoid the roof. “There is not a single roof penetration,” Trbovich says. “We wanted to make sure that roof would be able to move and slide. We wanted to make sure there were no contraction points that would hang it up, therefore we went with a design that would not allow roofing penetrations, whether it was a vent pipe, air duct or air-handling unit.”

Detailing was meticulous and consistent throughout, according to Trbovich. Flashing details were all designed to have a 6-inch overlap. “We went to extreme levels of detailing, whether it was in section cuts or in isometric cuts, to make sure that each and every one of those flashing details had that same 6-inch overlap. We required those be uniform across the facility on all corners, so that we essentially matched rake, eave jamb and corner flashing details.”

Installation Challenges

To ensure the details were correctly installed in the field, the architect and manufacturer worked closely during construction with the general contractor, KAST Construction, and the installer, Atlantic Roofing II of Vero Beach Inc.

The building’s exterior envelope features a metal roof system and metal wall panels manufactured by IMETCO. Photos: Borrelli + Partners

Atlantic Roofing IIapplied the standing seam roof system and metal wall panels, as well as a small single-ply roof on a flat section near the entryway. IMETCO Series 300 panels in Cardinal Red were installed on both the roof and walls, while white IMETCO Latitude panels were also installed on the walls.

The metal roof system was installed over the structure’s metal deck. It included 3 inches of polyiso insulation, 5/8-inch DensDeck and Aqua-Block 50 peel and stick, high-temperature underlayment.

The absence of penetrations simplified the metal roof installation, notes Steven Cottrell, project manager and chief estimator for Atlantic Roofing II. “The panels were rolled right on the site, and the longest ones up there are 168 feet long,” he says.

The roll former was stationed on the ground, and panels were lifted to the roof with a special cradle. “IMETCO brought out the metal and provided the machinery to roll them out, and the panels were placed onto giant spacer bars and loaded onto the roof,” Cottrell explains. “It was a bit of a challenge. We had 20 men up on the roof unloading them.”

The flat roof sections connecting the two buildings and the entryway were covered with a Seaman FiberTite KEE membrane, which was fully adhered over 3 inches of polyiso, tapered insulation and 5/8-inch DensDeck.

The roof system features a large internal gutter, which was lined with the same FiberTite roof system. Metal panels drop into the gutter and pick up on the other side, so it was crucial to ensure the area would be watertight and the panels would line up perfectly. “We worked closely with the architect and manufacturer on that,” notes Cottrell. “We used their eave detail and high eave detail, and it worked very well.”

Elegant Solutions

According to Cottrell, the roof and wall installations went smoothly and the roof is performing well — despite a hurricane and a 100-year rainstorm. “We’ve had no leaks, zero callbacks,” he says.

Photos: Borrelli + Partners

As the building was completed, Borrelli + Partners worked with the county to design the landscaping around the structure. “Our architects and interior designers work very closely with the landscape crew,” Trbovich notes. “We’re concerned about the physical space — external, internal, architectural and throughout. It’s a real holistic design approach, and you don’t see that with most architectural firms.”

The result is a project that Cottrell and Trbovich point to with pride. “It’s a unique structure,” says Cottrell. “It was a challenging project, but we rose to the challenge and banged it out. It’s like a little star for us on the fridge, if you know what I mean.”

For Trbovich, what stands out the most is the marriage of form and function in the many details. “While the building looks interesting with the awning and the striking form of the red standing seam roof, what’s crucially important is all the things we just talked about that are embedded in that design — the solutions themselves.”

TEAM

Architect: Borrelli + Partners, Orlando, Florida, www.borrelliarchitects.com
General Contractor: KAST Construction, West Palm Beach, Florida, www.kastbuild.com
Roof System and Wall System Installer: Atlantic Roofing II of Vero Beach Inc., Vero Beach, Florida, www.atlanticroofing2.com

MATERIALS

Metal Roof Panels: Series 300 in Cardinal Red, IMETCO, www.imetco.com
Metal Wall Panels: Series 300 in Cardinal Red and Latitude in White, IMETCO
Underlayment: Aqua-Block 50, IMETCO
Cover Board: 5/8-inch DensDeck Prime, Georgia-Pacific, www.densdeck.com
Single-Ply Membrane: 50-mil FiberTite XT KEE, Seaman Corporation, www.fibertite.com

Curved and Tapered Zinc Panels Highlight Canadian Subway Entrance Pavilion

The Vaughan Metropolitan Centre Subway Station is one of six new subway facilities near Toronto. Photos: Rheinzink

The new Vaughan Metropolitan Centre Subway Stationis truly an artistic jewel on Toronto Transit Commission’s (TTC) Spadina Subway Extension. One of six new facilities on the route, the station offers intermodal transit services and rapid subway connection to downtown Toronto.

The curvilinear design of the main entrance pavilion creates a futuristic appearance for the structure. The design offers a column-free interior environment with high ceilings and bright open spaces that allow daylight to penetrate deeply into the station.

Highlighting the exterior design is a standing seam roof that brings the structure to life. Approximately 12,000 square feet of Rheinzink Classic bright rolledpanels clad the curved roof of the impressive building. The roof offers high solar reflectance and combines with significant sustainable initiatives throughout the project. The station exceeds Canada’s National Energy Code requirements for energy performance by 40 percent and meets sustainability standards comparable to those required for LEED Silver certification.

Approximately 12,000 square feet of zinc panels clad the curved roof of the station, which exceeds Canada’s National Energy Code requirements for energy performance by 40 percent. Photos: Rheinzink

More than 1,000 uniquely tapered panels were fabricated by Rheinzink distributor Agway Metals Inc. at its facility in Exeter, Ontario. “No two panels are alike,” says Paul MacGregor, estimator. “Each panel had an individual taper and length. We fabricated the panels using our CNC turret, which was key to achieving the exact taper for each panel right down to the millimeter.”

Providing precise panel specifications to Agway Metals was the installer, Bothwell-Accurate, of Mississauga, Ontario. It was a demanding process, according to Trevor McGrath, Bothwell’s estimating manager for cladding. “We used a 3-D scanner on the roof structure and then utilized Radius TrackCorporation to design the curved framing system that went on top of the roof structure,” McGrath notes. “The Rheinzink panels were thenapplied on that. Radius Track confirmed the skin model of the 3-D structure for us and then computer-flattened it so that we could begin doing sheet design and layout. The flattened model gave us critical dimensions regarding panel lengths and widths.”

The panels were curved on site by Bothwell-Accurate using Agway’s Schlebach machine. “We did a sheet stagger at the beginning of the installation with the two panel lengths, which then allowed us to stagger all of the joints which is recommended,” McGrath says.

Bothwell-Accurate has considerable experience in installing zinc.“We’re very familiar with how to form and work with the natural metal,” McGrath states. “The architects wanted an ‘old school’ appearance with hammered seams and the manner in which the flashings and counter-flashings were done. There was a painstaking amount of detailing done around the 46 skylights in the roof. Each one required custom attention. We had productions crews on the job getting the panels down and then finishing crews crafting the detail work.”

The curvilinear design of the main entrance is capped with a standing seam roof comprised of zinc panels from Rheinzink. Photos: Rheinzink

Design for the station was a collaboration of Grimshaw Architectsand Adamson Associates Architectsin conjunction with ARUP Canada.

Goals of the Vaughan Metropolitan Centre included encouraging greater use of public transportation, facilitating efficient transfers between modes of transportation, as well as creating an interesting aesthetic experience. The domed entrance pavilion integrates a mirrored ceiling art installation by Paul Raff Studio designed tocapture the drama of moving passengers and changing light conditions.

Juan Porral, partner at Grimshaw Architects, summed it up this way: “We are always looking for opportunity to create high-quality places with real character. By elevating a functional building to something artful and full of life that people will remember and enjoy, we can have a greater impact on urban space and user experience.”

Composite Shake Is the Answer for Home in British Columbia

The Siebert residence was originally built in 1991. Its original cedar shake roof was replaced with a new roof system featuring composite shakes. Photos: DaVinci Roofscapes

Myrtle Siebert grew up in the logging industry as the granddaughter of a hand logger in British Columbia, Canada. She married a man who dreamt of having his own logging company and saw that dream come true. But when it came time to replace the cedar shake roof on her own home near Victoria, she decided to go with composite shake shingles because of their durability, fire resistance, and ease of maintenance.

Siebert and her son did their homework. They visited local builder supply businesses and then struck gold when they hiredVictoria-based Custom Roofing Inc.to do the job. Siebert worked closely with Caleb Friesen, owner of Custom Roofing, to make sure she got the roof system she wanted.

“Caleb and his team confirmed what we already knew … that composite shake from DaVinci was the product for my home,” says Siebert. “I chose the style and color of the composite shakes carefully so that the new fake cedar shakes would look like the real cedar roof we had previously. Mission accomplished.”

“She definitely wanted to maintain the look and feel of the thick wood shakes that the house had on it previously,” Friesen notes. “The idea of longevity and consistent appearance truly appealed to this homeowner. The selection of Bellaforté Shake in the Tahoe color blend really complements the design of this house.”

Photos: DaVinci Roofscapes

Made of pure virgin resin, UV and thermal stabilizers plus a highly-specialized fire retardant, Bellaforté products are created to resemble natural slate and shake products. The composite roofs are designed to resist fading, rotting, cracking and pests, plus high winds, hail and fire. The realistic-looking roofing tiles stand up to weather challenges while requiring no maintenance.

Siebert was intimately involved in the re-roofing process. “I had been directly involved in building this home back in 1991, plus several others over the years,” she says. “I love doing the planning and design work. Caleb was delightfully communicative and his team of workers was fabulous.”

Despite interruptions of pelting rain, snow obliterating the drawn lines and slippery conditions causing work stoppages, the team from Custom Roofing was careful and dedicated to the re-roofing process. “This roof gives me confidence,” Siebert says. “As much as I love wood, I no longer have to worry about maintaining a real cedar shake roof. The DaVinci composite shake is the best possible option I could find for staying as close to real wood on our roof.”

Prompt Response to Damage and a New Roof Help Restore Phoenix Library

The new roof atop the Burton Barr Library features a fully adhered Sarnafil PVC membrane. Photos: Star Roofing Inc.

At 6 p.m. on Saturday, July 15, a microburst over the roof of Burton Barr Library in Phoenix, Arizona, was strong enough to lift the membrane and the pavers meant to protect the structure during such extreme weather conditions. The structure, including the roof, is designed to remain mechanically stable and adapt as the stress on the building increases, but the severe wind event ultimately led to a broken sprinkler system.

The sprinkler system was installed under the roof system on the topside of the metal deck. Water rained down from the fifth floor and spread throughout the building. Upon initial evaluation, it was believed that approximately 50 percent of the building had water damage. At one point there were several inches of standing water on the first floor.

The structure and roof deck were determined to be sound. The immediate goals included temporarily protecting the roof area from any further rain, as the weatherproof membrane had been disturbed, and drying out the moisture inside the building.

Star Roofing Emergency Services was called by Brycon Construction Company, and a crew of Star roofers spent the weekend preforming roof repairs to get the roof in the dry and mitigate further interior damage.

Installing the New Roof

Star Roofing’s estimating and operations departments worked with Brycon Construction and the city of Phoenix to put together re-roof specification and budget pricing to install a new roof.

After it was damaged during a high-wind event, the existing roof system, including loose-laid membrane, insulation and interlocking pavers, was removed and recycled. Photos: Star Roofing Inc.

The existing roof system consisted of loose-laid EPDM over two layers of 4-inch polyiso insulation over a steel deck. Ballast consisted of 1 1/2-inch-thick interlocking pavers. Complete removal of the existing system was required. In all, 23 semi loads of insulation, 6 1/2 tons of membrane and 255 tons of concrete pavers were removed. Star Roofing recycled 100 percent of the pavers at Cemex USA in Phoenix, where the company grinds pavers and uses the material in making concrete. The EPDM and the roof insulation were also recycled through Nationwide Foam Recycling.

Access and the roof height provided challenges, especially in the roof removal process. The 34,000 pavers, each weighing 15 pounds, were placed in small trash bins. Pavers were removed 45 at a time, as this was the maximum weight per bin that Star’s crane could handle with the jib extended at the angle required to reach the building.

Safety is always the paramount concern, according to Jeff Klein, vice president of Star Roofing. “Challenges included exposed edges on the north and south roof deck and the removal of the ballast pavers with our crane due to the weight of the pavers themselves,” he notes. “To overcome these concerns, we limited the number of pavers removed at a time so as not to overstress the crane, and we made use of mobile fall protection carts and permanent safety tie-off davits.”

Additional work was required due to the replacement of the damaged sprinkler system. The sprinkler was installed above the roof deck and buried under the roofing system. Because of possible litigation, the sprinkler system piping had to be marked, disassembled and lowered to the ground. The system was then reassembled in the parking lot for inspection by the city of Phoenix and their consultants.

The new roof specified was a fully adhered Sarnafil PVC system. Crews from Star Roofing installed 5/8-inch DensDeck cover board, which was mechanically fastened with gray screws to match the underside of the exposed metal deck. Screws had to be kept in straight lines because of their visibility. A self-adhered vapor barrier was installed over the cover board. It was topped with one layer of 3-inch polyiso and two layers of 2 1/2-inch polyiso, all set in adhesive.

Photos: Star Roofing Inc.

A special installation method was required at the perimeter to protect against another high wind occurrence. Four layers of 5/8-inch DensDeck and two layers of 2 1/2-inch polyiso insulation, all secured with adhesive, were installed 18 feet in from of the roof edge.

The entire 43,000-square-foot roof area then received a Sarnafil 72 mil Fleeceback PVC membrane that was fully adhered. The system carries a 25-year warranty.

The project progressed smoothly, notes Klein. “That’s what we do every day — working collaboratively with many stakeholders to problem solve and design a system that meets the needs of the building, doing the job in a timely manner, and minimizing disturbance to daily business and other major construction underway.”

TEAM

General Contractor: Brycon Construction, Chandler, Arizona, www.brycon.com
Roofing Contractor: Star Roofing Inc., Phoenix, Arizona, http://starroofingaz.com

MATERIALS

Membrane: 72-mil Fleeceback PVC, Sika Sarnafil, https://usa.sarnafil.sika.com
Cover Board: DensDeck, Georgia-Pacific, www.densdeck.com

Insulated Metal Panels Lend New Rec Center Weather and Fire Performance

Photos: Metl-Span

The new Lander County Recreation Center, also known as “BM Rec” to area residents, provides a daily splash of energy and enthusiasm to the quiet mining community of Battle Mountain, Nevada. Featuring bold, ribbed insulated metal panels, single-skin rainscreen panels and a standing seam roofing system, the project showcases a comprehensive metal building envelope and the best in performance and aesthetics offered by NCI Building Systems Inc.

Designed by VanWoert Bigotti Architects, the Lander County Recreation Center strikes the perfect balance between industrial and commercial architecture. The project pairs a steel frame system by Star Building Systems with more than 50,000 square feet of metal panels by Metl-Span and MBCI.

Metl-Span insulated metal panels make up the bulk of the project’s high-performance metal exterior, providing thermal and moisture performance in a single, easy-to-install component. Designers blended 16,997 square feet of the ribbed 7.2 Insul-Rib profile with 4,595 square feet of lightly-corrugated CF Mesa panels for dramatic wall relief. Specified in both Charcoal Gray and Igloo White, the insulated metal panels provide exceptional aesthetic versatility.

While the 3-inch insulated metal panels boast an exceptional R-value of 23.58, the project team was equally impressed with the product’s unique, single-component construction. The ease of installation creates a weathertight building envelope after just one pass, creating efficiencies throughout the construction process.

Lander County Recreation Center showcases a comprehensive metal building envelope, with bold, ribbed insulated metal panels, single-skin rainscreen panels and a standing seam roof system. Photos: Metl-Span

The insulated metal panel system was installed without a hitch, according to Larry Rogers, owner of G&S Construction. As first-time Metl-Span IMP installers, Rogers and his team of builders underwent training at the nearby Metl-Span West manufacturing facility in Las Vegas.

“Everything went up smoothly,” Rogers says. “I’ve heard nothing but positive reactions from the architect and the building owners.”

Designers accented the ribbed insulated metal panels in Charcoal Gray with a custom green single-skin metal panel from MBCI that provides aesthetic harmony with interior design and signage elements. The bold green exterior also serves as the project’s aesthetic focal point, drawing attention to the street-facing entrance.

“The lime green panels really strike the eye,” notes Associate Project Manager Charlie Grundy, VanWoert Bigotti Architects. “We wanted to inject some personality and energy to the project, and I think it was a big success.”

The project also incorporates fire-rated insulated metal panels, featured solely on a storage facility on the eastern side of the building’s perimeter. While not part of the initial design, Lander County Recreation Center representatives requested additional storage space to meet the needs of its growing suite of programs and activities. Measuring approximately 600 square feet, the new addition “called for a firewall because of its proximity to a nearby school to meet codes,” Rogers said.

The team from VanWoert Bigotti did not hesitate to specify Metl-Span ThermalSafe panels. “The fire-rated panels were required at the common area between the Battle Mountain Junior High School gymnasium building and the storage building,” says Armando Velazquez, building service representative with Star Building Systems.

The building was crowned with a standing seam roof comprised of 22,853 square feet of 24-gauge CFR insulated metal standing seam roof panels. The roof panels are exposed on the interior. Photos: Metl-Span

ThermalSafe mineral wool panels combine exceptional fire-resistance with the thermal and moisture performance that can be expected from Metl-Span insulated metal panels. The product’s unique LockGuard interlocking side joint further enhances the fire-resistant performance of the panel with its tongue-and-groove engagement of the mineral wool core. The fire-rated panel also offers excellent structural characteristics and span capability.

The Lander County Recreation Center incorporates 972 square feet of 24-gauge, 4-inch ThermalSafe insulated metal panels with a Light Mesa profile and matching Charcoal Gray hue.

To complete the all-metal building envelope, VanWoert Bigotti Architects specified 22,853 square feet of 24-gauge CFR insulated metal standing seam roof panels. Featuring 2-inch standing seams with the lightly-corrugated Mesa profile, the CFR panels are exposed on the interior for smooth sightlines and a modern aesthetic appearance.

The product combines durable exterior and interior faces of Galvalume steel with Metl-Span’s unmatched polyurethane insulating core. Factory-cut panel ends and factory notching eliminate field work and erection costs, while weathertight vertical side seaming leads to additional installation efficiencies.

Battle Mountain residents celebrated the grand opening of the new Lander County Recreation Center with two days of free admission in July 2017.

TEAM

Architect: VanWoert Bigotti Architects, Reno, Nevada, www.vwbarchitects.com
General Contractor: Core Construction, Reno, Nevada, www.coreconstruction.com
IMP Installer: G&S Construction, Battle Mountain, Nevada,

MATERIALS

Insulated Metal Panels: Insul-Rib and CF Mesa panels, Metl-Span, www.metlspan.com
Roof Panels: 24-gauge Mesa CFR insulated metal standing seam roof panels, Metl-Span
Metal Accent Panels: Custom green metal panels, MBCI, www.mbci.com

Waterproofing Membrane Is Solvent Free

NOVALINK WMChem Link launches NOVALINK WM, a waterproofing membrane available in two- or five-gallon pails. NOVALINK WM is a cold-applied, single-component waterproofing membrane that cures by exposure to atmospheric and substrate moisture to form a continuous, tough, reinforced elastic seal. It is solvent-free and compliant with all known environmental and OSHA requirements, allowing its use in confined spaces with standard personal protection equipment.

For more information, visit www.chemlink.com.

Metal Panels Illuminate Institute for Contemporary Art at VCU

The exterior of the Institute for Contemporary Art features 28,000 square feet of zinc roof and wall panels. Photos: Rheinzink

The Institute for Contemporary Art (ICA) at Virginia Commonwealth University (VCU) will bring the most important, cutting-edge contemporary art exhibits in the world to the VCU campus and the city of Richmond. Located in the striking new Markel Center and designed by architect Steven Holl, the ICA offers 41,000 square feet of flexible space including a 33-foot-high central forum. The ICA features a dynamic slate of changing exhibitions, performances, files and interdisciplinary programs.

“We designed the ICA to be a flexible, forward-looking instrument that will both illuminate and serve as a catalyst for the transformative possibilities of contemporary art,” Steven Holl says. “The fluidity of the design allows for experimentation and will encourage new ways to display and present art that will capitalize on the ingenuity and creativity apparent throughout the VCU campus.”

In keeping with VCU’s master sustainability plan, the ICA incorporates state-of-the-art technologies and environmentally conscious design elements and makes use of numerous natural resources.

The exterior for the contemporary design features 28,000 square feet of Rheinzink roof and wall panels. According to Steven Holl Architects, “The prePATINA blue-grey Rheinzink exterior interfaces with clear and translucent glass walls and skylights that infuse the building with natural light and lessen reliance on nonrenewable energy. The zinc shares the same greenish-gray tonality as the matte glass, giving the building a shifting presence from monolithic opaque to multifarious translucent depending on the light.”

The Rheinzink panels were custom fabricated A. Zahner Company. They were installed by Kalkreuth Roofing and Sheet Metal. Photos: Rheinzink

The custom cassette panels were designed and fabricated by Rheinzink systems partner A. Zahner Company, Kansas City, Missouri, and installed by Kalkreuth Roofing and Sheet Metal, Wheeling, West Virginia.

The open joint metal panel rain screen system utilized 1.75-mm zinc. According to Zahner project manager John Owens, “The 1.75-mm zinc is a little heavier than normal but that’s what the architect wanted.” Zahner provided 1,200 total panels, of which 200 were curved. “We cut those panels radially as needed to fit the curved aluminum frame. All of that fabrication was done in our shop.”

Gary Davis, Zahner’s director of marketing, added, “We developed multiple panel systems using Rheinzink materials on a supply-only basis. To create museum-quality edges and detailing, Zahner digitally defined the scopes of work and fabricated from our 3-D model. Preceding construction tolerances were dealt with in a timely manner.”

TEAM

Architect: Steven Holl Architects, New York, www.stevenholl.com
Roofing Contractor: Kalkreuth Roofing and Sheet Metal, Wheeling, West Virginia, www.krsm.net
Metal Fabricator: A. Zahner Company, Kansas City, Missouri, www.azahner.com

MATERIALS

Zinc Roof and Wall Panels: 1.75-mm prePATINA zinc, Rheinzink, www.rheinzink.us

Working With Homeowners Associations Means Taking on Big Challenges

Glenwood Townhomes in San Dimas, California, includes 185 residential units, a clubhouse, standalone garage and park restroom building. The re-roofing project encompassed 250,000 square feet of shingles. Photos: La Rocque Better Roofs

A quick glance at the numbers reveals that Glenwood Townhomes in San Dimas, California, is not your everyday residential re-roofing project. Featuring 185 units plus a clubhouse, standalone garage and park restroom building, and requiring the installation of 250,000 square feet of shingles, the project is expansive in scope, to say the least. But for nearly 40 years, La Rocque Better Roofs has enjoyed taking on challenging roofing projects, and the team put a plan in place to take on a very ambitious and complex assignment.

With literally hundreds of homeowners impacted by the re-roofing project, the Glenwood Townhomes Home Owner Association (HOA) board of directors through its property management company, Personal Touch Property Management Company, actively sought a roofing company that had been in business for 20-plus years and, most importantly, was experienced in working with HOAs. Doug McCaulley, owner of Personal Touch Property Management Company, has managed Glenwood HOA for several years and knew he needed a company that was large enough and had the proper labor force to handle the size of the project — and would also be around to honor its warranty.

La Rocque Better Roofs has served customers throughout Southern California since 1981, and approximately 80 percent its business is focused on HOAs. The company has developed a process for effectively managing the multiple parties and considerations involved in HOA remodeling projects. Beyond the HOA board, other parties commonly involved in re-roofing projects include property management companies, roofing consultants, and maintenance and service organizations. From a project management perspective, challenges involved in HOA remodeling projects include dealing with any structural or code-related discoveries that arise once the project begins and minimizing inconvenience to residents.

The HOA board selected the Owens Corning TruDefinition Duration shingle in Desert Tan. Members desired both the aesthetics and the benefits of solar reflectivity. Photos: La Rocque Better Roofs

Labor availability is a key consideration for HOA projects, as such projects require a sizeable labor pool to be available for an extended period. Rory Davis, vice president of HOA Sales at La Rocque Better Roofs, says a readily available roofing team was a key factor in the selection of La Rocque Better Roofs for the project. “We do not subcontract our workers and work with a team of 75-110 people, depending upon the time of year, so that the project stays on schedule,” says Davis.

While project management skills, logistical know-how and labor are all required for HOA projects, the most important element in a re-roofing project is satisfying the homeowners living in the community. All these considerations went into La Rocque Better Roofs’ approach to the re-roofing of Glenwood Townhomes.

A Customized Approach to Roof Removal

The design of the Glenwood Townhomes community presented some structural challenges. Detached garages adjacent to each building blocked access for workers during the removal process. La Rocque Better Roofs found a way to resolve this challenge, investing in customized, extra-wide, sturdy walk boards to bridge the distance between the homes and garages. The walk boards allowed roofers to remove roofing from the home and then walk the removed materials directly into the truck. “Walking the debris right to the truck was a big plus, because materials didn’t touch the ground and didn’t come into contact with mature shrubs and landscaping,” says Guy La Rocque, president and CEO. “It was reassuring to homeowners to know that nails and debris wouldn’t be dropped in their yards and exterior living areas.” The system also supported efficiency. La Rocque estimates the walk boards reduced tear-off time by four to five hours per building.

“Safety and efficiency on all of worksites are key factors in being a successful and sought-after company,” La Rocque states. “The rules and requirements are constantly changing with OSHA, and it’s our responsibility as the management team at La Rocque Better Roofs to make sure all our employees are always up to date with the latest information. Our weekly Tailgate Safety Meetings as well as our monthly safety and education meetings help us maintain a level of awareness. It’s one thing to be educated in OSHA’s safety requirements; it’s another thing to implement and monitor these safety procedures on our jobsites.”

Surprises are not uncommon when remodeling mature properties. During the re-roofing project, some fireplaces in the community were found to be unstable. La Rocque Better Roofs worked with city permitting officials and engineers to retrofit the fireplaces so that they remained safe and functional without requiring a complete tear-down and rebuilding of the fireplaces.

Communication and the “Contractor Bubble”

Among the many steps La Rocque Better Roofs employed to simplify the process, Guy La Rocque says communication with residents was especially valuable. “We scheduled after-hours meetings with the residents to keep them informed about the project, answer their questions and let them know what to expect,” he says. “Over the years, we’ve found the best thing you can do is get homeowners involved. You can never communicate enough, so we let residents know what time our crews would be on site, where the crews would be working and what we expected to accomplish. “

Crews from La Rocque Better Roofs made sure to protect the landscaping as the project progressed. The company has made working for HOAs its primary focus. Photos: La Rocque Better Roofs

From La Rocque’s perspective, too many contractors operate in a “contractor bubble,” losing sight of other opportunities to add value to both homeowners and the contractor’s business. Listening to homeowners helps open up opportunities that may exist for additional work. “When you get homeowners involved, you get a different perception of what needs to happen,” La Rocque says. “The majority of us are homeowners, but many times we forget the most important thing we want from a contractor is communication.” He adds that the construction industry has suffered from a perception that too often contractors show up and leave whenever they want, leaving the customers in the dark. No one likes to be surprised. Keeping the homeowner informed can go a long way toward achieving more satisfied customers and generating more referrals.

Davis says that communication has never been more important than today, in the era of social media. “Yelp has become the new Better Business Bureau,” he says. “Social media provides more opportunities than ever before for consumers to either pat us on the back or criticize us.”

 Changing it Up

The Glenwood Townhomes community was built in 1973, and the roof replacement provided an opportunity to introduce trending colors and technology improvements to residents’ roofs. The HOA board wanted to select a color that would lighten up the overall look of the community and also take advantage of solar reflectivity. The HOA selected the Owens Corning TruDefinition Duration shingle in Desert Tan.

Asked about the shingle manufacturer’s involvement in the project, Davis says manufacturers’ reps can make a big difference. “Availability is key, and a willingness to bring samples onsite or address any problems that come up is critical. You learn a lot by how a manufacturer deals with any problems that arise. We may go years without a problem, but when something happens, we want someone who will step up,” he says. He also likes the Owens Corning Sure Nail technology and says the strip that ensures optimal placement of each nail is a plus.

HOA projects are not for every contractor. But through planning, establishing strong relationships with engineers, permitting organizations and other partners, thoughtful approaches to on-site challenges and most importantly, listening to customers, HOAs present an opportunity for contractors to take on projects of size and style.