Waterproofing Membrane Designed to Protect Wood and Metal

MFM Building Products, a manufacturer of a full envelope of waterproofing and weather barrier products for the building industry, introduces DeckWrap PowerBond.

DeckWrap PowerBond is a self-adhering waterproofing membrane that protects the surface of the wood with a highly aggressive, patented PowerBond adhesive system. The membrane aggressive bonds to wood or metal surfaces at temperatures as low as 25°F (-4°C). The membrane also is self-sealing around nails, screws, punctures and other fasteners. The self-sealing properties prevent water penetration to protect the structural elements extending the life of the deck.

DeckWrap PowerBond is suitable for use with treated, untreated and synthetic woods and stops corrosion of metal components that come in contact with ACQ-treated lumber. It is ideal for ledgers, joists, top edges and post applications to protect against premature rot and degradation. The “self-stick” property allows for quick and easy installation. The only tools required are a sharp utility knife.

DeckWrap PowerBond is available in pre-packaged rolls of 3-inches and 6-inches by 75-feet length, and 12-inches width by 25-feet length. Thickness of the membrane is 25 mils. For more information, visit www.mfmbp.com.

 

Metal Roofing Underlayments Protect Structures in Hawaii

The newly constructed Safeway Shopping Center, Honolulu, happens to be the largest Safeway on the Hawaiian Islands. It contains a parking garage below—in part, because of its location in a densely populated neighborhood.

The underlayment manufacturer worked on and approved a design in which the underlayment could be installed directly on the metal deck.

The underlayment manufacturer worked on and approved a design in which the underlayment could be installed directly on the metal deck.

ITS METAL ROOF WAS INSTALLED by Kapolei, Hawaii-based Beachside Roofing, which has been doing business in Hawaii for more than 25 years. The company, which installs all kinds of roofing and waterproofing systems, specializes in high-rise buildings, resorts and complex projects.

The 20,000-square-foot metal roof on the Safeway store had to meet strict color requirements in keeping with the Safeway brand. The color of the roof is Gargoyle, which is a greenish-brown.

The metal roofing was designed to be installed over corrugated 20-gauge steel decks. The underlayment manufacturer worked on and approved a design in which the underlayment could be installed directly on the metal deck.

The metal deck (HSB-36SS type) was installed with the wider corrugations facing up and parallel to the eaves (horizontally). The self-adhering underlayment also was installed horizontally, and the metal panels were then attached to the horizontal corrugations of the deck using panel clips and self-drilling fasteners penetrating through the underlayment into the flattop of the corrugations of the steel deck.

The self-adhering underlayment also was installed horizontally, and the metal panels were then attached to the horizontal corrugations of the deck using panel clips and self-drilling fasteners penetrating through the underlayment into the flattop of the corrugations of the steel deck.

The self-adhering underlayment also was installed horizontally, and the metal panels were then attached to the horizontal corrugations of the deck using panel clips and self-drilling fasteners penetrating through the underlayment into the flattop of the corrugations of the steel deck.

The walkability of the underlayment was an important factor, considering that the roof slope was 4 inches per 12 feet in some places. Also, the 120-day exposure allowance for the underlayment was reassuring, though not necessary for this project.

The metal roofing system included many architectural elements, such as canopies, penthouses and mansards. It covers not just the Safeway supermarket, but also other shops in the Safeway Shopping Center. The way the metal was used architecturally really dressed up the exterior of the project.

Secondary Water Barrier

A self-adhering metal roofing underlayment, like the one on the Safeway Shopping Center, perfectly complements metal roofing panels. The underlayment provides a watertight secondary membrane while the metal panels serve as the primary roof to protect against wind-blown objects and UV radiation. If the primary roof is damaged, the secondary roof acts as the water barrier.

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