When your project requires a heavy-duty waterproofing solution that can withstand extreme thermal shifts, PRIMO-TORCH APP Smooth, distributed by A1A Wholesale Supply, is the professional choice. The Atactic Polypropylene (APP) modification provides the bitumen with a high softening point (302°F), ensuring the membrane remains stable and does not flow in intense heat, while maintaining excellent cold-world flexibility.

The high-strength polyester reinforcement allows the membrane to resist the mechanical stresses of building expansion and contraction. Featuring a sanded top finish for enhanced foot traffic durability and a PE film bottom for efficient torch-welding, this membrane creates a seamless, monolithic layer. Whether used as a base ply or a secondary waterproofing layer, PRIMO-TORCH APP Smooth is designed for maximum performance in high-stakes environments.

Product Details

• Manufacturer: PRIMO / Nord Bitumi.

• Compound: Plastomeric Polymer Bitumen (APP).

• Reinforcement: Single Strand Composite Polyester.

• Thickness: 3.8 mm.

• Roll Dimensions: 32.8’ x 3.28’ (approx. 107 sq. ft.).

• Finish: Sand (Upper) / PE Film (Lower).

• Application: Torch-Applied or Mechanically Fixed.

Features & Benefits

• High Thermal Resistance: A softening point of 302°F makes it ideal for hot climates and high-temperature roof decks.

• Superior Tensile Strength: With a rating of 100 lb (MD), it provides the structural integrity needed for demanding commercial roofing assemblies.

• Excellent Elasticity: Offers 40% elongation, allowing the membrane to move with the substrate without cracking or delaminating.

• Enhanced Dimensional Stability: The non-woven polyester core ensures the roll maintains its shape during and after the torching process.

• Versatile Application: Suitable for cementitious surfaces, metal decks, and wood structural decks (when used with appropriate base sheets/primers).

Application Highlights

• Substrate Prep: Apply a bituminous primer (approx. 300-400 g/m²) to clean, dry surfaces before torching.

• Overlaps: Ensure side laps of 10 cm and head laps of 15 cm for a completely watertight seal.

• Staggered Placement: Position sheets in a staggered pattern, starting from the lowest point of the slope to ensure proper water shedding.

• Heat Welding: Use a propane gas torch to melt the PE film and bitumen compound, creating a visible “bead” at the seams to confirm a perfect weld.

Storage & Recommendations

• Upright Storage: Rolls must be stored vertically in a dry, ventilated area to avoid deformation.

• Temperature: For best results, apply at temperatures above +5°C (+41°F). In colder weather, store rolls in a heated area until immediately before use.

• Slope Requirements: Minimum 1.5% slope on concrete decks and 3% on steel/wood decks to prevent ponding water.

Technical Specifications & Performance