Making ceiling plane airtight, and attic insulation
Just watched the video regarding vented attics and insulation.
We are re-purposing a 40 year old mill building. (Norfolk, Ct 06058, the icebox of CT). Radiant heat in finished concrete floors is in, German Shucco windows installed. We have a new standing metal seam roof, done. There are sofit vents on both sides, all along the gutter line, ridge vent entire length of roof, as well as 2 gable vents. We have already sprayed soy foam in the walls, 5.5 inches (closed cell). The HVAC trunks are installed just above the proposed drop ceiling.
My question is, how do we make the ceiling plane airtight? Will paint be enough?
And should we spray open cell foam on top of the trunks, and recessed cans (IC and sealed)? roughly 10″-12″. We could opt for closed cell above the ceiling also.
I would like to save a few bucks on the open cell application, if you think its smart money.
Please advise on how to create an airtight ceiling plane, and help me choose the right insulation
for our ceiling. (Building inspector is making noises about spraying directly over sheet rock. he said the moisture from the foam would ruin the sheetrock–kindly comment on this, too)
Thank you in advance
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