STPE Roofing - 5 Gallon Pail

Hulk STPE® is a single-component, liquid-applied, fire-resistant, moisture-cure silyl-terminated polyether (STPE) waterproof coating. Designed to serve as an air and water-resistive barrier, it protects commercial & RV roof and wall systems. The coating prevents air and water leakage behind roof substrates and wall claddings and provides persistent adhesion while allowing movement with high elongation properties. Its moisture-cure capability ensures adhesion to damp or green surfaces.

Characteristics / Advantages

• Fire-resistant with a Class “A” fire rating (<20 flame spread and <60 smoke).
• Moisture-cure formulation enables application to damp or green surfaces.
• Rain-safe within minutes of application.
• Can be applied at ambient temperatures as low as -4°C (25°F).
• Reduces number of coats required. High solids content allows up to 60 mils of application in a single lift.
• Meets ASTM C836 Standard for High Solids Content, Cold Liquid Applied Elastomeric Waterproofing Membranes.
• Fast curing reduces construction sequencing time by shortening backfill and the introduction of rain/moisture wait times.

• Unlike silicone, STPE can be top-coated with water-borne, acrylic, urethane and select resinous coatings.

Uses:

• Waterproofing for commerical & RV roof surfaces, below-grade foundations and above-ground construction when heavy humidity or moisture is present.
• Can also be used for waterproofing window & door frames, planter boxes, plaza decks, bridges, man-hole & sewer, and splitslab applications.
• Sealing foundations and backfilled walls.
• Use on concrete, ICF foam, fiberglass, SBS, TPO, EPDM, metal, masonry, brick, siding, metal and stucco.

Application Instructions

Surface Preparation

• Ensure substrates are clean, dry, sound, and free from grease or contaminants. Prepare the substrate with a suitable profile for the best adhesion. Test in a small area before commencing.
• Fill voids and gaps in surface and treat joints with a minimum of 60 mils of product for a smooth monolithic surface.

Application

• Treat cracks and corners with a 30-mil detail coat. Extend coverage a minimum of 3 inches (7.6 cm) on both sides of the corner or crack.
• Apply with a trowel, roller, or spray equipment, ensuring a continuous, downward water drainage plane.
• For Foam: Inspect for defects and prepare gaps over 1/16 inch (1.6 mm) with low-expansion spray foam. Attach drainage panels with coarse-thread screws or embed geotextile for rigidity.

Limitations

Do not apply below the recommended temperatures or for underwater applications. Follow all manufacturer instructions for optimal performance.

Disclaimer

Hulk Systems Inc. ensures the quality and performance of Hulk STPE® when used according to guidelines. While the product is designed to deliver consistent results, outcomes may vary based on specific site conditions and application methods.

Liability is limited to the replacement of the product or a refund of the purchase price in the rare case of a defect. Hulk Systems Inc. excludes coverage for labor costs, consequential damages, or improper application. For optimal results, users should adhere to all preparation and application instructions provided.

Manufacturer website: https://hulksystem.com/stpe/