Q: I have a dryer exhaust vent pipe to install through an exterior wall. How do I make a hole in the drywall that will line up perfectly with the hole in the siding?
—Joe Reed, Williamsburg, KY
A: Starting inside the house, make a small hole in the drywall and check for studs, wires, and pipes. Once you know you have a clear spot, cut the hole for the pipe in the drywall. Take out any insulation that's in the way. Dryer-vent pipe is usually 4 inches in diameter, so the hole should be about 4¼ inches across to provide some wiggle room for fitting. Vent kits typically have a collar that covers minor gaps between drywall and pipe.