I'm going to be installing some drywall in cold weather. Does anyone have any advice for me? I'm working disaster relief and most of the places I'm in have no heat. I know materials contract and expand depending on the weather so I did some reading to find out about drywall in those conditions. Here is some of what I read:
Gypsum Board in Cold Weather
finishing in freezing weather - Drywall Finishing - Contractor Talk
What's the worst that can happen if drywall is installed at 40 degrees or below?
Also because the area was flooded there are a lot of houses where the drywall and insulation was removed like a foot or so above the water line. When the new insulation is installed does its vapor barrier have to somehow connect to the hidden vapor barrier behind the already existing top half of drywall? What kind of damage can happen if the two vapor barriers aren't connected? And does anyone have any other advice for joining the drywall in this situation? I'm going to try to make sure they're the same thicknesses obviously.
Here's a picture typical of what I'm seeing
Also if someone can explain the why for this bullet point from the first link:
Thanks
Gypsum Board in Cold Weather
finishing in freezing weather - Drywall Finishing - Contractor Talk
What's the worst that can happen if drywall is installed at 40 degrees or below?
Also because the area was flooded there are a lot of houses where the drywall and insulation was removed like a foot or so above the water line. When the new insulation is installed does its vapor barrier have to somehow connect to the hidden vapor barrier behind the already existing top half of drywall? What kind of damage can happen if the two vapor barriers aren't connected? And does anyone have any other advice for joining the drywall in this situation? I'm going to try to make sure they're the same thicknesses obviously.
Here's a picture typical of what I'm seeing

Also if someone can explain the why for this bullet point from the first link:
One more thing, if anyone can give me advice on how to create a clean crisp horizontal cut line like in that pic. I anticipate I'll probably have to clean up some ragged lines. Is there some special tool with a guide or something that I can place horizontally and then drag a razor back and forth until the piece falls off? I'd rather not use a dremel, my concern is possible asbestos in joint compound going into the air.If a polyethylene vapor retarder film is installed on ceilings behind the gypsum board, it is important to install the blanket ceiling insulation BEFORE the gypsum board. If loose fill insulation is used, install the insulation IMMEDIATELY after the gypsum board.
Thanks