Breathable Synthetic Underlayments — S&W Forest Products Ltd. S&W Forest Products Ltd.

Breathable Synthetic Underlayments

This articles give information on synthetic underpayments that are now available. If you are using it for Cedar Shakes or Shingles make sure that is has a permeable rating of more than 1 and check with your local building codes

The current state of underlayments could be summed up in three words, “better than ever,” according to Tom Metoxen, Manager of Technical and Warranty Services for Carlisle Residential.

“There have been numerous advances in the manufacturing of underlayments to provide multiple options for multiple purposes,” Metoxen said. “Carlisle has made an effort to provide a wide range of underlayments to meet the wide range of needs in roofing industry.”

The variety of finished roofing products can dictate what must be used as an underlayment, said Metoxen, noting that with metal roofing a heat resistant or high temperature product must be used. “Different climates can also require the use of a specific underlayment,” he said.

Roofing underlayments were originally used for temporary protection against the elements, but are now an integral part of a building’s overall roof systems, said Anthony Mass, technical administrator for Polyglass USA.

““Underlayments provide a vital layer of protection on top of the sheathing to help keep moisture out of the building, and are considered a necessary piece of the roofing structure,”” Mass said. “The advancements made in roofing systems and roofing underlayments lead to a stronger, longer-lasting roof that holds up better against weathering.”

UV exposure time limits depend on the type and surfacing of the membrane.

“Today, more contractors are making the switch to underlayments that are exceptionally strong, faster and easier to install, durable when exposed to elements of nature and more breathable than traditional felts,” Sebuktekin said. “Traditional felts are not as strong and durable, and can absorb moisture, causing severe buckling and wrinkling.”

GAF-Elk recognizes the growing need and is promoting such products as Deck Armor Premium breathable underlayment as part of a complete roofing system.

“This is more than just having a great product, it is also about providing field technical support as well as education to the roofing contractor on how to promote and sell superior underlayments,” Sebuktekin said. “The roofing industry has seen many entries from synthetic underlayment manufacturers who said, ‘I have a product just like that,’ and followed by their subsequent exits due to product failure and/or lack of contractor support and education.”

Synthetic underlayments continue to grow at the expense of traditional asphalt felt paper, said Sandro Di Pede of SDP Advanced Polymer Products. “The cost gap between synthetic and felt is reducing, thus helping to generate additional interest and trial of synthetics,” Di Pede said. “But what is key to synthetic acceptance and continued growth is safety with respect to walkability on pitched roofs, especially in wet, dusty, contaminated conditions.”

Tarco President Steve Ratcliff said there are strong forces at work in the underlayment marketplace. “Not long ago, traditional asphalt-saturated felt was a mainstay of residential roofing,” Ratcliff said. “Unfortunately, it did not perform well as a secondary water barrier, it was subject to UV deterioration, and it had very short exposure limits during installation.”

Ratcliff said many types of self-adhering and synthetic underlayments have been introduced over the last 10 years, with the addition of specialty products designed for specific roofs and climates. As a result, the underlayment product category is gaining tremendous respect. “Labor savings coupled with superior performance will encourage most contractors to offer premium underlayment to customers as standard rather than as an optional upgrade,” said Ratcliff. “The superior dry-in benefits and UV resistance of premium underlayment gives contractors greater flexibility in scheduling primary roofing system installations. The secondary water barrier provides extra protection when the primary roof fails for whatever reason.”

Edward Sueta, marketing manger at ALCO-NVC Inc. said the key ingredient to the success of underlayments is the ice and water protector used under shingles, metal and slate. “They come in smooth, granulated and a high temperature version for under metal,” Sueta said. “Future generations must consist of a hybrid that is synthetic and able to seal around nails, metal fasteners and metal screws one that can do it all.”

The manufacturers provided the information contained in the following underlayments roundup. For more information on these products, please contact the manufacturers or visitwww.roofingcontractor.com .

ATAS International Inc.

Product Name: ATA-Guard Synthetic Roofing Unerlayment

Application: It can be used under all types of primary roofing materials.

Composition: ATA-Guard is polyolefin based, 100 percent asphalt-free, reinforced underlayment.

Size of roll: It has a nominal thickness of 25 mils and is available in rolls 48 inches wide by 256 feet long (1,024 square feet). Each roll weighs 42 pounds.

Is it walkable? Yes.

Comments: ATA-Guard is a highly engineered, mechanically attached, coated woven synthetic roofing underlayment. Polymers are combined to produce a gray color that is much cooler than traditional asphalt-based underlayments.

Contact information: 610-395-8445, www.atas.com .

ALCO-NVC Inc.

Product Name: ALCO SHIELD: 275, 276 SMOOTH and 277 SMOOTH HT.

Application: 275 and 276 are placed under shingles. 277 HT recommended under metal or granular surface membranes.

Composition: Fiberglass reinforced, polymer modified asphalt. 275 have a granular surface. 276 and 277HT have a filmed surface.

Size of roll: 1 (34 pounds) and 2 (66 pounds) square rolls granular surface. Smooth 1 (32 pounds) and 2 (60 pounds) square rolls.

Is it breathable? No. It is a vapor barrier and must have proper ventilation.

Once installed, how long can it be left exposed? 60 days.

Is it walkable? Weather permitting; use caution.

Comments: It is a fiberglass-reinforced waterproofing layer that under shingles resist ice dam and under metal gives waterproof protection. Easy installation with split back self-adhering technology. Seals around nails, metal roofing fasteners and metal screws.

Contact information: 800-323-0029, www.alconvc.com .

ATAS International Inc.

Product Name: ATA-Shield Self Adhesive Underlayment

Application: Uses include, but are not limited to, application under metal roofing where a water resistant barrier is required. It is also suited for desert climatic conditions.

Composition: ATA-Shield is composed of a homogeneous rubberized asphalt waterproofing compound, glass fiber reinforced, with a polypropylene fabric surface. An aggressive self-adhesive compound is applied to the bottom surface.

Size of roll: Membrane is 80 mils thick; rolls are 3 feet, 3 3/8 inches wide by 65 feet, 8 inches long (200 square feet). Each roll weighs 80 pounds.

Is it suitable for use in high-temp applications (metal)? Yes.

Is it breathable? No.

Once installed, how long can it be left exposed? 90 days.

Is it walkable? Yes. For slopes greater than 3:12, backnailing will be required.

Comments: ATA-Shield is a self-adhering underlayment designed specifically for use under metal roofing.

Contact information: 610-395-8445, www.atas.com  .

Atlas Roofing Corporation

Product Name: Gorilla Guard

Application: Asphalt shingles, metal roofing, synthetic slate shingles, metal shingles, wood shakes-shingles, etc.

Composition: Asphalt saturated felt reinforced with glass fibers.

Is it walkable? Yes, same as asphalt saturated felt underlayments.

Comments: Gorilla Guard is a high-performance, glass fiber-reinforced, saturated felt underlayment designed to lay flatter and dry quicker than ordinary saturated felt products. It also has much higher nail holding ability to keep the product on the roof in windy conditions.

Contact information: 770-933-4479, www.atlasroofing.com .

CertainTeed Corporation

Product Name: Roofers’ Select High Performance Underlayment

Application: Roofers’ Select is designed for use on roof decks as a water-resistant layer beneath roofing shingles.

Composition: Roofers’ Select is an asphalt-impregnated, fiberglass-reinforced organic felt shingle underlayment.

Size of roll: Roofers’ Select is approximately 44 pounds per roll and covers 400-square-feet. It is 144 feet in length and 3 feet wide.

Is it suitable for use in high-temp applications (metal)? No.

Is it breathable? Yes.

Once installed, how long can it be left exposed? Roofers’ Select is not designed to be permanently exposed to sunlight or to the weather.

Is it walkable? Yes.

Comments: Roofers’ Select is manufactured to meet ASTM D6757 requirements and is UL classified. It lays flat and is extremely resistant to wrinkling. Roofers’ Select reduces the likelihood of slipping and doesn’t tear away from fasteners when walked on or in strong winds.

Contact information: 800-233-8990, www.certainteed.com .

CertainTeed Corporation

Product Name: WinterGuard Series

Application: Waterproofing underlayment for shingle, metal, slate and tile roofs; also suitable for metal roofs.

Composition: WinterGuard is a composite material of asphalt polymers, formed into a rolled sheet. It is available in three different surface finishes: sand, high temperature (HT) and granular.

Size of roll: HT film (short) 29 pounds, 97.5 square feet. HT film 54 pounds, 195 square feet. Sand film (short) 36 pounds, 32.5 square feet. Sand film 69 pounds, 65 square feet. Granular 72 pounds, 65 square feet. All finishes are 3 feet wide.

Is it breathable? Yes. WinterGuard serves as a vapor barrier.

Once installed, how long can it be left exposed? 6 months.

Is it walkable? Yes.

Comments: WinterGuard HT is specially formulated to resist roof temperatures up to 250 degrees Fahrenheit under metal roofs. WinterGuard Sand and Granular underlayments are designed for use on roof decks as a waterproofing barrier.

Contact information: 800-233-8990, www.certainteed.com .

Cosella-Dörken Products Inc.

Product Name: DELTA-VENT S

Application: Clay tile, concrete tile, slate (asphalt shingles and metal cladding possible, but other DELTA roof underlayments are available which are particularly designed for these claddings).

Composition: Two spun-bonded non-woven PP-layers heat-bonded to a waterproof and highly vapor permeable film in the middle.

Size of roll: Length 164 feet; width 4.9 feet; weight 11 24 pounds.

Is it breathable? Yes. The product is highly vapor permeable. At the same time it is impermeable to water and air (thus can also be used as an air barrier).

Once installed, how long can it be left exposed? Suggested maximum UV exposure time is 3 months.

Is it walkable? Yes. It has two non-slip surfaces.

Comments: DELTA-VENT S is a highly vapor permeable (120 perms) synthetic roof underlayment, allowing moisture within the roof to escape through the membrane. It is ideal for non-ventilated roofs with concrete, clay, or slate tiles.

Contact information: 905-563-3255, www.deltaroofunderlayments.com .

Cosella-Dörken Products Inc.

Product Name: DELTA-FOXX

Application: Clay tile, concrete tile, slate over ventilated or non-ventilated attic spaces.

Composition: Spun-bonded non-woven PET fabric with special acrylic coating (proprietary process).

Size of roll: Length 164 feet; width 4.9 feet; weight 35 pounds.

Suitable for use in high-temp applications (metal)? Yes.

Is it breathable? Yes. The product is highly vapor permeable at around 500 perms. At the same time it is impermeable to water.

Once installed, how long can it be left exposed? Suggested maximum UV exposure time is 6 months.

Is it walkable? Yes. It has two non-slip surfaces.

Comments: DELTA-FOXX is a highly vapor permeable synthetic roof underlayment, allowing moisture within the roof to escape through the membrane. It is ideal for ventilated or non-ventilated roofs with concrete, clay, or slate tiles.

Contact information: 905-563-3255, www.deltaroofunderlayments.com .

Cosella-Dörken Products Inc.

Product Name: DELTA-MAXX TITAN

Application: Clay tile, concrete tile in combination with ventilation space (lath/counter lath installation).

Composition: Needle-punched non-woven PET fabric with special PU-coating (proprietary process), generating an extremely strong underlayment that is waterproof and highly vapor permeable at the same time. On the topside the underlayment is coated with a titanium layer that reflects up to 50 percent of solar radiation.

Size of roll: Length 164 feet; width 4.9 feet; weight 29 pounds.

Is it breathable? The product is highly vapor permeable (commonly described as breathable) at around 40 perms. At the same time it is impermeable to water.

Once installed, how long can it be left exposed? Suggested maximum UV exposure time is 4 months.

Comments: DELTA-MAXX TITAN is a highly vapor permeable synthetic roof underlayment, allowing moisture within the roof to escape through the membrane. it is idela for non-ventilated roofs with concrete or clay tiles.

Contact information: 905-563-3255, www.deltaroofunderlayments.com .

Cosella-Dörken Products Inc.

Product Name: DELTA-TRELA

Application: This underlayment is specifically designed for metal roof cladding (copper, zinc, galvanized steel, etc.).

Composition: Two layers of spun-bonded non-woven PP, heat-bonded to a highly vapor permeable, waterproof film in the middle, with a 3-dimensinal fiber mesh layer heat-bonded to its top side.

Size of roll: Length 98 feet; width 4.9 feet; weight 36 pounds.

Is it breathable? The product is highly vapor permeable (120 perms). At the same time it is impermeable to water.

Once installed, how long can it be left exposed? 3 months.

Is it walkable? Yes. It has two non-slip surfaces.

Comments: Its integrated drainage layer makes it ideal for ventilated or non-ventilated roofs with metal cladding.

Contact information: 905-563-3255, www.deltaroofunderlayments.com .

ECP Engineered Coated Products

Product Name: Nova-Seal II

Application: Asphalt shingles, cedar shakes and shingles, concrete and clay tiles, metal, slate, stone-coated metal, synthetics.

Composition: Woven synthetic barrier with polypropylene weave and rubber-modified polyolefin coatings. The textured topside provides wet and dry anti-slip protection. Bottom side is designed to reduce slippage.

Size of roll: Width: 4 feet. Length: 250 feet (1,000 square feet per roll). Weight: 32 pounds each.

Is it breathable? Yes. Nova-Seal II Premium Roofing Underlayment is a vapor barrier.

Once installed, how long can it be left exposed? 12 months.

Is it walkable? Yes.

Comments: Nova-Seal II synthetic underlayment lightweight, strong and durable. The textured rubber surface makes installation easy and safe. Meets Miami Dade County Wind uplift requirement.

Contact information: 800-565-2000, www.ecpinfo.com .

GAF-Elk

Product Name: Shingle-Mate

Application: Roof deck protection.

Composition: Fiberglass reinforced felt.


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