Ensuring the long-term integrity of a roofing system, particularly on high-sloped decks, requires a robust defense against ice damming and water intrusion. LAMA UL, supplied by A1A Wholesale Supply, is an advanced self-adhesive roofing underlayment engineered to deliver this critical protection.

LAMA UL is a self-adhesive roofing underlayment featuring a glass mat carrier coated with a unique blend of SBS polymers, premium asphalt, and additives. This composition provides the perfect balance of durability and flexibility. The top surface is a sanded layer, offering slip resistance for safer application, while the underside features an easily detachable silicon-based release film covering a highly adhesive asphalt layer.

Key Features and Benefits for Contractors:

• Self-Adhesive: Simplifies installation, providing a strong bond to the substrate.
• Split Release Film: Enhances ease of application during installation.
• Slip Resistant: Sanded top surface improves safety for installers.
• Excellent Adhesion: Provides strong adhesion to multiple substrates.
• High Flexibility: Conforms well to roof contours and accommodates structural movement.
• Good Dimensional Stability: Maintains its shape and performance over time.
• Tear and Puncture Resistant: Offers robust protection against damage during and after installation.
• Vapor Barrier: Contributes to the overall building envelope by preventing moisture vapor transmission.
• Rot Resistant: Ensures long-term durability in challenging environments.

Uses: LAMA UL is specifically designed as an underlayment on high-sloped roof decks to protect against leaks caused by ice and water intrusion. It is highly effective in critical roofing areas susceptible to ice dam build-up, such as:

• Rakes
• Eaves
• Valleys

Standards and Certifications: LAMA UL complies with the standards of ASTM D1970 and CSA A123.22-08.

Product Care (Storage):

• Rolls should be stored upright.
• Cover rolls if stored outside to protect from elements.
• Avoid direct prolonged sunlight exposure.
• Storage temperature should not exceed 43∘C.

Application:

• The surface must be clean and free from contaminants such as dust, oil, grease, and debris.
• If needed, prime the surface with LAMA PRIMER or other recommended primers.
• Use roofing nails if underlayment support is needed; do not use staples.

Product Details:

• Description: SBS modified roofing underlayment.
• Top Surface: Sanded layer.
• Undersurface: Easily detachable silicon-based release film covering a highly adhesive asphalt layer.
• Thickness (min): 1mm (ASTM D5147)
• Maximum Load (L, T): 4.4 KN/m (ASTM D2523)
• Elongation at Break (L, T): 10% (ASTM D2523)
• Adhesion to Plywood at 4∘C (min): 0.92 kg/30.5cm (ASTM D903)
• Adhesion to Plywood at 23∘C (min): 5.44 kg/30.5cm (ASTM D903)
• Thermal Stability: 3 mm (ASTM D1204)
• Flexibility Temperature: −29∘C (ASTM D1970)
• Tear Resistance (L, T): 89 N (ASTM D4073)
• Waterproof Integrity of Lap Seam: Pass (ASTM D1970)
• Sealability Around Nail: Pass (ASTM D7349)
• Moisture Vapor Permeance (max): 5.7 ng/Pa.S.M2 (ASTM E96)
• Roll Width: 1m (39 in)
• Roll Length: 20m (65.6 ft)
• Gross Coverage: 20 m2(215 sqft)
• Net Coverage: 17 m2(183 sqft)