Don't be fooled by those cheesy cable-TV home improvement shows. Drywall and gypsum finishing products should be installed when the temperature is 55 F degrees or higher. As the temperature goes over 80 F, you'll start to suffer, especially if it's humid. Drywall expands as the temperature goes up. Drywall finishing materials perform poorly in temperatures below 55 degrees. Never allow drywall finishing materials to freeze before they are completely dry.
Frozen finish compounds can lose their strength and possibly lose their bonding qualities as well. Humidity can also cause expansion and contraction problems in drywall. This expansion can cause the boards to become wavy due to the expansion.
Excessive humidity can also cause ceiling drywall to sag between framing members. In the event this happens, it cannot be corrected. The force of gravity pulls the drywall down and it will retain this bowed shape. Damaged drywall panel edges should be cut out. Don't try to fasten crushed or fractured drywall. Often during delivery or installation, the edge of the drywall panels may get bumped.
The result of this is a fractured edge. The gypsum core becomes fractured while the paper covering may or may not be intact. Often the result looks like a blister. These areas should be cut out and any fractured core material should be removed.
Do not try to install fasteners through a damaged area. The fractured area will have little ability to hold a fastener. The board or panel may sag in this area at a later date. For a top-notch job, make sure that framing members are in alignment. Bowed or twisted walls studs will cause wavy walls. Misaligned framing members can also result in nail pops. Nailheads will frequently puncture the paper covering the core. This is the Bible of hanging and finishing drywall.
I recommend you buy this and read the section on drywall. This is the most recent edition as of We'll send you a link that lets you create a new password.
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