WF300 Intumescent Firestop Caulk is a high‑performance, latex‑based firestop caulk specifically engineered for residential wood‑frame construction. Designed to protect penetrations in wood stud walls and wood floor/ceiling assemblies, WF300 provides reliable firestopping for plumbing, electrical, and mechanical penetrants in multifamily buildings. When exposed to fire, WF300 Intumescent Caulk undergoes rapid expansion—growing up to five times its original volume. This expansion helps seal voids around penetrants, forming a dense, insulating char that slows the spread of flames, smoke, and hot gases. Its smooth application, strong adhesion, and performance under fire make WF300 an ideal firestop solution for residential contractors seeking dependable protection and ease of use.

Features

• Installer friendly, easily applies with standard caulking gun
• Suitable for combustible and non-combustible penetrants
• Tested for up to 3 Hours of fire exposure when tested to ASTM E814/UL1479

20 oz sausage
12 pcs/ctn