In 95 F deg attic (probably 105 now) @ 50 - 60% humidity, how long to let the "1st coat" of mastic dry, before installing flex duct?
It's 8" collar, 8" R-8 flex.
Instructions say "allow to dry 48 hours before pressure testing" (I believe).
Nothing mentioned about at what temp, or humidity, etc.
Seems like a long time to wait in hot weather, if people had no AC?
Put a new start collar, on rigid duct board plenum this morning.
All surfaces cleaned 1st w/ alcohol.
Put one med. layer mastic - thick enough to hide (most) the corrugated flange & enough to hide the silver duct.
Then embedded mesh tape, brushing over it enough to push it into the mastic.
So, not a very thick layer mastic.
Don't want to risk the mastic not being bonded as strong as needs to be, before stretching / pushing / messing with the new duct.
It's 8" collar, 8" R-8 flex.
Instructions say "allow to dry 48 hours before pressure testing" (I believe).
Nothing mentioned about at what temp, or humidity, etc.
Seems like a long time to wait in hot weather, if people had no AC?
Put a new start collar, on rigid duct board plenum this morning.
All surfaces cleaned 1st w/ alcohol.
Put one med. layer mastic - thick enough to hide (most) the corrugated flange & enough to hide the silver duct.
Then embedded mesh tape, brushing over it enough to push it into the mastic.
So, not a very thick layer mastic.
Don't want to risk the mastic not being bonded as strong as needs to be, before stretching / pushing / messing with the new duct.
