How to apply mastic to seal ducts
#1
How to apply mastic to seal ducts
Is there somewhere to find a procedure for sealing old (40yrs)
ductwork with mastic??
ductwork with mastic??
#2
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.