Seal it for keeps. Joints that require firestopping can't do the job if they break their seal under normal expansion and contraction. That's why 3M™ Firestopping products are tested to ensure a tight seal in all environmental conditions, year in and year out.
Over the past 20 years, we've provided training for more than 5,000 code officials, architects, contractors and firestop professionals at our online fire-test center. These two-day classes fill up fast – sign up today!