Mastic Duct Sealing #8 One Gallon

RCD Corporation® #8 Mastic® is a low VOC sheet metal air duct sealant used for permanently sealing the joints and seams of all duct types including UL-181 listed air ducts. RCD Corporation® #8 Mastic® is the best choice for high velocity sheet metal air duct construction used in auditoriums, high rises, hospitals, industrial ventilation systems, large retail stores, malls, military buildings, prisons, schools, sports centers and complexes. It remains flexible and withstands the constant joint movement of these demanding systems.

• Water-Borne & Non-Flammable
• Weather Resistant
• Contains Ceramic Microspheres
• Water Borne
• Low Odor
• Low VOC (less than 10 grams/liter)
• Preferred By Professionals Nationwide
• Fire Resistant
• UL Listed
• Elastomeric
• High Solids Content
• Easy Application & Clean-up

Heating and Cooling Air Duct Repair Tips

Q. Why is sealing air ducts important?

A. An average home with leaking air ducts will waste hundreds of dollars each year. This waste is unnecessary and can be easily solved. Health and safety is the most important reason to seal air ducts properly. Air ducts are usually located in attics, crawl spaces, or basements. Air handling units are often located in the home's garage. If the return air plenum leaks, air is drawn from these areas directly into the home. This air is often contaminated with automobile exhaust, combustible gases, pesticides, fertilizer, mold, excess humidity, and even radon.

Q. How do duct leaks affect heating and cooling equipment?

A. Air duct leakage of 20% will lower the efficiency of the heating/cooling system by 50% or more. These leaks lower heating and cooling capacity, which forces the system to run longer, reducing its lifespan. Many indoor comfort complaints are due to poor air duct installation and sealing.

Q. Why is duct leakage so common?

A. Many connections are not sealed during the construction process. Many times air ducts are not installed with the proper support and over time the joints pull apart. RCD Mastics are the preferred method for sealing air ducts.