Kathy writes from Medfield, Massachusetts: "We have just added a garage to our home, but the walls in the garage are just studs and plywood. Can we insulate these unfinished 3 walls? (garage is attached to our house and gets very cold; also our laundry room bumps out into garage)"

Answer: Yes, you can insulate those walls! In some new construction the garage walls are left unfinished as a matter of cost savings. This is very common.

If the plywood you see is on the outside of the studs under the siding, you can add PINK fiberglass insulation batts between the exposed studs. I recommend Kraft-faced batts for this application. After the insulation is installed you will need to cover the insulation with plywood or gypsum wallboard. The insulation should not be left exposed.

If the plywood you see is on the inside, either remove the plywood and install batt insulation or have a professional come and blow insulation into the cavities.