Three Polyiso Roof Insulation Options to Simplify Your Next Job

Pre-fabricated roof sumps direct water to a center drain point, helping to ensure proper drainage and minimizing installation time. Photos: Hunter Panels

As a roofing professional, you undoubtedly are familiar with polyiso insulation, as it is used in 70 percent or more of the commercial roofs in North America. Polyiso is popular with roofing professionals because it offers a high R-value per inch, is affordable, readily available, compatible with many roofing systems and meets both FM 4450 and UL 1256.

While you likely have specified or installed flat stock polyiso products, you might be less familiar with specialized product make-ups, which can help you simplify roof insulation jobs. Three options to be aware of are:

  1. Tapered systems
  2. Pre-cut hips and valleys
  3. Pre-fabricated sumps

Tapered Systems

As roofing professionals know, water is the enemy of the roof assembly. To prevent ponding and provide a positive slope to drain, polyiso insulation manufacturers offer sloped panels. Tapered polyiso typically comes in 4-foot-by-4-foot or 4-foot-by- 8-foot panel sizes, and in various compressive strengths. Commonly available slopes (per foot) include 1⁄16 inch, 1⁄8 inch, 3⁄16 inch, 1⁄4 inch, 3⁄8 inch and 1⁄2 inch. Tapered systems range from two-panel to eight-panel repeats, with such systems including varying thicknesses of flat polyiso insulation to complete the taper profile.

Photos: Hunter Panels

Tapered polyiso insulation installs similar to flat stock polyiso insulation, using adhesives or fasteners. As with multi-layer flat stock installations, when installing tapered products, crews should stagger the joints between layers to reduce potential pathways for airflow and condensation within the insulation layers.

Full-service polyiso manufacturers can design a tapered insulation layout based on the roof plan and specified R-value. They then will provide shop drawings showing where to place each tapered and flat stock panel to ensure positive slope and effective drainage across the entire roof.

Pre-Cut Hips and Valleys

In addition to the one-way sloped tapered panels discussed above, roofing professionals have access to pre-cut hips and valleys made of polyiso insulation. The hips and valleys help direct water on more complex roof designs. Well-equipped manufacturers will custom design and fabricate pre-cut, one-piece polyiso hips and valleys to meet your jobsite requirements including slope, and minimum and maximum thicknesses.

While crews can form hips and valleys by field-cutting tapered panels, ordering the pre-cut, one-piece panels reduces labor time and costs, as well as dumpster fees. It also prevents material waste caused by cutting errors.

Pre-Fabricated Sumps

Going a step farther in slope complexity, and further reducing ponding water, some polyiso insulation manufacturers offer pre-fabricated roof sumps. Commonly available as 4-foot-by-4 foot panels that ship flat, pre-fabricated sumps direct water from four directions to a center drain point. Some manufacturers also offer 8-foot-by-8-foot hinged sumps for greater design flexibility. All of these sumps offer a variety of starting thicknesses at the drain from 1/2 inch to 2 inches.

Choosing a Polyiso Supplier

Roofing professionals can obtain polyiso roof insulation from several suppliers. Which one is right for you? Following are a few factors to consider to help simplify your next roofing job.

  • Access to technical support: Some polyiso manufacturers provide customers with a variety of technical services. Having access to designers and estimators who work every day with specialized polyiso products takes the guesswork out of the process for you, saving time and money while helping ensure a high-quality roof.
  • Ready availability: Choosing a supplier with facilities throughout the country helps ensure timely access to specialty polyiso insulations when you need them.
  • Training support: To help your crews get up to speed faster on working with specialized polyiso roof insulation systems, look for a manufacturer that offers training support — whether via online videos, in person or on the jobsite.

Bryer Co. Now Offers X-Gard Snow Retention

The Bryer Co., a supplier of metal construction fasteners and accessories, launches its sales of the new S-5! X-Gard pipe snow retention system for standing seam metal roofs. As one of the only full-line S-5! distributors to offer online purchasing through an e-commerce store, and because there is an increasing market demand for stronger snow retention solutions, The Bryer Company expects X-Gard to become a top seller.

X-Gard is a non-penetrating snow retention system designed to preserve roof manufacturers’ warranties. Its innovative double-clamp design allows X-Gard to provide unprecedented holding strength when attached with S-5!’s standard or even mini-sized clamps; no other pipe snow retention system on the market has proven stronger. A one- or two-pipe system spanning up to 48 inches, X-Gard provides a reliable snow retention solution in a wide variety of situations.

For almost 30 years, The Bryer Company has been the premier manufacturer of architectural and commercial metal roof, wall, and soffit systems in the Northwest. The Bryer Company is also a long-time strategic national distributor for S-5!, carrying a full line of accessory mounting solutions, including the industry-leading ColorGard bar-type snow retention system. According to Peter Tuininga, VP at The Bryer Company, “Partnering with S-5! has been a jointly-profitable business venture. We’ve been able to provide our customers with truly innovative solutions by S-5!, the newest of which is the exceptional X-Gard.”

S-5! is the well-respected international authority on ancillary attachment technology for the metal roofing industry with products installed on over 1.4 million metal roofs worldwide. Providing strength and longevity never before seen, S-5! is trusted by engineers for critical holding strength, by architects for sleek design aesthetics, by roofers for zero-penetration technology, and by contractors for easy installation.

Rob Haddock, CEO at S-5!, feels confident that The Bryer Company will see high interest in the X-Gard, stating, “At S-5! we’ve always take innovation, engineering, development, thorough testing, and proper market introduction very seriously. Bryer trusts us to provide them with top-of-the-line products like X-Gard, and we have seen that Bryer, in turn, provides unbeatable customer service, including their popular e-commerce option.”