Johns Manville, a Berkshire Hathaway company, manufactures residential and commercial insulation, commercial roofing, mechanical insulation and materials ...

The Problem! Leaking Heating & Air Conditioning Ducts The Solution! RCD Mastics permanently seal the leaks RCD Corporation Mastics Water-Based Non-Toxic Weatherproof Excellent Longevity (actually strengthens with age) Mold and Mildew Resistant Elastomeric Fire Resistant Easy Application & Clean-Up Won't Run or Sag Manufactured in the USA Our line of elastomeric, water-based mastics and adhesives ...