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How To Seal Air Ducts With Mastic.

Seal Leaky Air Ducts & Save Energy 

 

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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