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Securock® Brand Gypsum-Concrete Patch (formerly Pyrofill® Gypsum Concrete) is a gypsum-based patch compound formulated for professional repair of poured roof decks, including gypsum roof decks. It delivers high compressive strength, fast-setting performance and a non-combustible composition suitable for fire-rated roof deck systems.

Key features

• High compressive strength: greater than 500 psi for durable patch repairs.
• Fast-setting: allows foot traffic and installation of fasteners in approximately 4 hours after application.
• Suitable for use on a variety of poured roof decks, including gypsum roof decks and other poured deck types.
• Mill-formulated composition of specially calcined gypsum combined with wood chips or shavings.
• Non-combustible per ASTM E136 and approved for use in UL Roof Deck Systems (P676, P503, P207, P229, P505, P507).
• Manufactured to conform to ASTM C317 (Standard Specification for Gypsum Concrete).

Technical specifications

• Typical compressive strength: >500 psi.
• Set/return-to-traffic: foot traffic and fasteners allowed in approximately 4 hours (fast-setting behavior).
• Composition: specially calcined gypsum with wood chips/shavings (mill-formulated).
• Fire performance: non-combustible per ASTM E136; approved for use in specified UL Roof Deck Systems.
• Standards: conforms to ASTM C317.

Applications and compliance

• Intended use: patching and repair of poured roof decks, including gypsum roof decks.
• Fire-rated applications: suitable for use in approved UL Roof Deck Systems listed above.
• Manufacturer/brand: Securock® (formerly marketed as Pyrofill® Gypsum Concrete).
• Commodity code (site): 127910.