When reliability and speed are critical for your low-slope roofing projects, PRIMO-SA BASE, distributed by A1A Wholesale Supply, delivers a professional-grade solution. This membrane is specifically formulated to maintain superior flexibility in cold weather conditions, preventing the cracking often associated with standard asphalt products. The fiberglass reinforcement ensures that the sheet stays flat and resists stretching or warping during the installation process.

The dual-surface technology of PRIMO-SA BASE is built for multi-layer success. The aggressive self-adhesive bottom creates a permanent bond to primed substrates without the need for torches or hot asphalt. Meanwhile, the top surface is equipped with a “burn-off” film, which allows for a seamless transition if a torch-applied cap sheet is used as the secondary layer. Highly resistant to aging, acids, sulfates, and chlorides, this base sheet is a rugged, long-term defense for any commercial or residential building envelope.

Product Details

• Manufacturer: PRIMO / LAMA.

• Material: SBS Modified Bitumen with Fiberglass Reinforcement.

• Thickness: 1.3 mm (51 mils).

• Roll Dimensions: 39.4” x 65.6’ (1m x 20m).

• Coverage: 215 sq. ft. (2 Squares) per roll.

• Weight: 85 lbs per roll.

• Top Surface: Burn-Off Film.

• Bottom Surface: Siliconized Self-Release Liner.

• Standards: Complies with ASTM D6164 and CSA A123.23.

Features & Benefits

• Advanced SBS Elasticity: High-polymer modification ensures the membrane remains pliable and crack-resistant even in sub-zero temperatures.

• Dimensional Stability: The fiberglass core prevents the membrane from shrinking or “crawling” after installation.

• Chemical & Weather Resistance: Engineered to withstand exposure to harsh environmental pollutants, including sulfates and chlorides.

• Easy Application: The siliconized release liner pulls away cleanly, allowing for fast “peel-and-stick” installation over primed wood or concrete decks.

• Optimized for Multi-Layering: The burn-off film top is uniquely designed to receive a secondary cap ply, ensuring a high-strength interlaminar bond.

• Safety First: Eliminates the fire risks and odors associated with open-flame torching or hot kettles during the base-ply phase.

Product Application

• Substrate Preparation: Surface must be clean, dry, and properly primed for maximum adhesion.

• Alignment: Lay out the rolls and align them carefully before removing the release film.

• Bonding: Peel back the liner and apply firm pressure to ensure the membrane fully adheres to the substrate.

• Overlaps: Maintain side overlaps of 100 mm (4″) and end overlaps of 150 mm (6″) for a continuous watertight seal.

• Versatility: Can be installed in loose-lay, partially bonded, or fully bonded configurations depending on project specifications.

Technical Specifications & Logistics