TYVFCHW5015 Tyvek Firecurb Housewrap is a fire retardant membrane for commercial and residential buildings that uses new, patented technology. Firecurb is a lightweight, advanced, fire retardant membrane that self-extinguishes when ignited. It uses a halogen-free flame retardant coating to reduce the formation of droplets and smoke with minimal environmental impact. – Self-extinguishes when ignited – Forms no droplets when fire starts and limits the propagation of flames – Reduces smoke – Up to Euroclass B (free-hanging) classification, which nearly no other membrane can reach