Product Description

TREMstop IA+ is a high-performance, single-component, water- based, firestop sealant that will expand to fill the voids left when combustible materials burn and deteriorate in a fire.

Basic Uses

TREMstop IA+ is tested to treat 95 percent of the common applications found on a job site, including metal pipe, plastic pipe, insulated pipe, cables, ducts and multiple penetrations.

Features and Benefits

Advanced performance capabilities make TREMstop IA+ a best in class intumescent acrylic. This versatile firestopping product has exceptional sealant qualities, including superb unprimed adhesion, easy gunning and antifungal properties. It can also be painted once fully cured.

TREMstop IA+ will also seal against airflow, which will help to reduce sound transmission for openings breached by penetration. 

Dry Time

At 77°F (25°C), 50% RH, TREMstop IA+ is tack free in 30-60 minutes and dries at a rate of about 1/8 in. (3mm) per day. As the temperatures decrease, the dry time of TREMstop IA+ will increase, generally one additional day for every 10°F decrease in temperature.

Surface Preparations

For good adhesion, the substrate must be sound, clean and dry. Any surface damage, dirt, dust, loose particles or other contaminants that may inhibit adhesion must be removed from the surfaces prior to application of the sealant.

Tremco recommends that surface temperatures be 40 ̊F (5 ̊C) or above at the time the sealant is applied. If sealant must be applied in temperatures below 40 ̊F, please refer to the Tremco Guide for Applying Sealants in Cold Weather that can be found on our web site at


Priming is not required.