Fire-stopping Sealants

Ish—Intumescent fire stopping, used to seal off floor & wall penetrations, qualifies under IEQc4.1 as an Architectural Sealant. However, intumescent firproofing paint falls under IEQc4.2. Intumescent fire stopping usually fills gaps around pipe & conduit where they pass through a wall or floor. When exposed to extreme heat, the sealant expands, puffing up like popcorn, to fill the entire opening, often crushing the pipe or conduit to prevent it from becoming an avenue for smoke or flame. You are right. Use SCAQMD-1168’s 250g/L VOC limit for “Architectural Sealant.”

Ish—Non-intumescent cementitious mortars used to fire-stop wall or floor openings at penetrations may also fall under IEQc4.1, but only if they contain organic binders, polymers, or additives. Mortars that are entirely mineral-based are just mortar, and neither IEQc4.1 nor IEQc4.2 applies.