Leaking heating & cooling air ducts wastes energy & your hard earned money!
Remember: Insulation wrapped around air ducts does not stop air leaks.
RCD Corporation's Mastics seal better and lasts longer than tape.
For an experienced
installer, mastic is quicker to apply than tape.
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A. Clean Duct Surface
Use a cloth to wipe dust from the surface of the duct. If oily film or
grease covers the duct, wipe clean with a damp cloth. |
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B. Joints with Less than 1/4 Inch Gaps
Load brush with mastic. Coat the entire joint with a continuous strip
of mastic. Use end of the brush to work mastic into joint. Spread
mastic at least one inch on each side of the joint. Mastic should be
thick enough to hide the metal surface of duct -- about 1/16 inch thick. |
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C. Joints with Gaps Greater Than 1/4 Inch
If the gap in the duct connection is larger than 1/4 inch use
fiberglass reinforcing membrane in addition to mastic. If the membrane
is sticky on one side, cut enough membrane to cover the joint, press
the membrane in place, then cover with mastic. Apply enough mastic to
completely cover the membrane. If the membrane does not have a sticky
side, first apply a thin layer of mastic, press the membrane into the
mastic, then apply the finish layer of mastic. |
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D. Wrap Ducts with Insulation
RCD Mastics dry to touch in 2 to 4
hours. Insulation can be installed over wet mastic. But try not to move
the ducts too much, because the mastic seal could be damaged. All duct
support work should be done before applying mastic. |
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