New answers tagged winterizing
Foam insulation can be injected into the stud cavities. A contractor will drill one hole in each stud cavity to inject the foam through. Then you can patch the holes and paint over them. You should also check any windows in the room. Look specifically at the caulking around the frame. If it's old and dry/cracked, remove the old caulk, use window/door ...
I am having the exact same issue. Have tried several things like leaving all the valves closed but nothing seems to work.
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