WILREP Ltd. Vibration Isolation, machine installation and sound control products.

Increasing STC in Existing Walls - Using Barrier Composite Material
1. GOOD On existing wall, install 2" x 2" strapping. Press fit 2-3 lb density fiberglass between strap. Install BM-1C barrier on strapping with decoupler foam side out. Use staples or board headed nails. Do not overset the fastner- Set deep enough to compress foam layer without cutting barrier. Install 1 or 2 layers of drywall over barrier. All joints and seams in the barrier material and drywall should be positioned positioned in the middle of a strap. Note: Cut drywall full size for minimal gaps on all sides. Seal with a permanently flexible acoustic caulk.

2. BEST Erect new steel or wood in front of existing wall so that 1/4" to 1/2" space is developed between back of stud and existing wall. Press fit 2" - 4" of fiberglass between studs. Install BM-1C barrier and drywall as in example 1.

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