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Yes, any parts of drywall that are wet or overly moist will need to be replaced. Drywall is intended to be dry (it’s in the name, after all.), as excess moisture can lead to mold and mildew and eventually corrode your home’s foundational building pieces. Do regular inspections in your home to make sure all your plumbing is intact and in good condition—this will go a long way toward preventing leaks.

You shouldn’t leave drywall outside overnight, especially if you live in a wet or humid climate. The moisture from humidity, rain, or other elements can damage the drywall, making it weaker and susceptible to mold growth. Stash any extra drywall in a dry area away from the elements to protect it from moisture.

A 50-pound mirror can be hung on drywall, but only if it has the support of strong hardware. Ideally, you can find the studs behind the drywall and attach the mirror to them; this will give your mirror better stability. Otherwise, confirm that you are using anchors appropriate to the weight of the mirrors. Another technique is to use French cleats—two pieces of wood that fit together, with one piece attached to the wall and the other to the mirror. This allows the weight to be distributed over a wider area.

Yes, it is possible to DIY install drywall, but it is a deceptively complicated process that can be quite frustrating if you don’t have experience. Prepare to cut and screw drywall, leave the proper gap distance for any seams, never leave the end of a piece of drywall hanging off of a stud, and cut out around electrical boxes and switches. Plus, getting the drywall to look good is challenging, especially when taping and spackling. That’s why it’s usually a better idea to hire a professional drywall installer to ensure high-quality results.