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Insulating a Shower Drain Pipe

With the past 2 days of freezing weather, our new shower drain pipe-specifically the u-bend, has been frozen with the water sitting in the bend. Our shower/bathroom sits over a crawl space which is partially insulated.
My husband was able to heat the u-bend, but I want more of a permanent solution. He wants to use heat-tape on the PVC drain pipe and I told him I had heard that shouldn't be done. I need advice on what to do (other than insulating the crawl space with he knows we have to do). Thank you

Re: Insulating a Shower Drain Pipe

Insulating seems to be the fastest and most economical way to get this settled. Great Stuff will stick to it and be easily removed if you ever need to replace the pipe. A layer 3 inches thick sounds good more would be even better.

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