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How To Seal Air Ducts With Mastic.
Seal Leaky Air Ducts & Save Energy
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A CLEAN DUCT SURFACE
Use a cloth to wipe dirt, dust, and debris from the surface
of the duct. If oil or grease is present, wipe clean with a
damp cloth.
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B JOINTS WITH LESS THAN ¼ INCH GAPS
Coat the entire joint with a 2” wide by 1/16 of an inch
thick continuous strip of mastic, using the end of the
brush to work the mastic into the joint.
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C JOINTS WITH GAPS GREATER THAN ¼ INCH
Reinforce with RCD Corporation’s Glasscoat (fiberglass
mesh) in addition to mastic. Apply a coat of mastic per (B)
above, then embed Glasscoat into this first coat of
mastic and finish by applying a second coat of mastic
filling the mesh entirely.
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RCD Mastics seal better, last longer and are easier to apply than tape.
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