STI WF Intumescent Firestop Caulk is a latex-based, high-solids firestop sealant designed for wood frame construction. It's the go-to sealant for penetrations through wood stud walls and floor/ceiling assemblies on multifamily and residential projects. When exposed to fire, it expands to seal openings against the spread of fire, smoke, and combustion byproducts. Available in 10.1 oz tubes for any standard caulk gun, 20 oz sausages for high-volume jobsite use, or 5-gallon pails for large projects and bulk applicators.

Specifications

Available sizes: 10.1 oz tube (WF310), 20 oz sausage (WF320), and 5 gallon pail (WF305)
Color: Red
Type: Intumescent, latex-based, water-based
UL Certified: tested to ASTM E814 (UL1479) for up to 3 hours of fire exposure
Also tested to CAN/ULC-S115
Applications: cables, ductwork, metallic pipe, plastic pipe, head-of-wall
Acoustically tested, low VOC, paintable
FBC System Compatible
Made in USA
Brand: STI (Specified Technologies Inc.)

Find Your UL System

Documents

Use STI's System Search & Submittal Builder at systems.stifirestop.com, or call us and we'll help you find the right system for your job.

Ordering & Delivery

In stock at our Alpharetta warehouse. Free local jobsite delivery on orders of $500+ within 40 miles. This is a water-based product: during freezing weather we may limit shipping to local delivery or pickup to protect the material. Buying multiple pails for a project? Call (678) 691-5215 for volume pricing.