How to apply mastic to seal ducts

Old 10-14-02, 04:50 PM
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How to apply mastic to seal ducts

Is there somewhere to find a procedure for sealing old (40yrs)
ductwork with mastic??
Old 10-14-02, 06:34 PM
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Join Date: Aug 2001
Location: NW atlanta
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duct sealing

we use mastic in 1 gal buckets, applied with cheap 2" chip brush. seal EVERY seam on system. where duct comes off plenum, joints, lateral seams, etc. very simple. let it dry before reapplying any insulation so as not to disturb the seal before it dries.

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