Don't do installs anymore but back in the day yes and no. Should you? Yes. It's a very cut throat market in residential. 9 times out of 10 the low bid gets the work and I promise you his bid will not include duct sealing.
Mastic all seams, better than most duct tape. There is also matic tape but it is cheaper to buy a bucket and brush but a bit messy it you dont give it time to dry before wrapping/hanging.
I use a combo of paint on mastic & mastic tape.
depends on what is being sealed & if it has to be wrapped
or how close duct take offs are on plenums.
having both on hand makes it simple.
The cure of the part should not be attempted without the cure of the whole. ~Plato
Ok thanks for the responses. I personally prefer to duct seal it with paint on mastik because its the cheapest, but sometimes i use the foil tape, i would never use mastik tape its like $40 a roll. My boss insists we do it though i was just curious because i had the theory that its not a leak spot unless you undersize your ductwork. The way i see it is that the air wants to take the path of least resistance which is down the duct to the supply or return, why would it want to fight its way through a tiny crack if the duct isnt undersized.
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Originally Posted by Datsik
