Under-Insulated Walls
3/3/2021 (Permalink)
If pipes traveling in exterior walls have frozen in the past (tell-tale signs include water damage, mold, and moisture build-up), it’s probably because of inadequate or improperly installed insulation. It might well be worth the couple hundred dollars it costs to open up the wall and beef up the insulation.
"When nothing else works, say for a northern wall in a really cold climate, the last resort is to reroute a pipe," notes Abrams. Depending on how far the pipe needs to be moved — and how much damage is caused in the process — this preventative measure costs anywhere from $700 on up. Of course, putting the room back together is extra.
https://www.houselogic.com/organize-maintain/diy-repair/prevent-freezing-pipes/
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