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Plumber suggested using foam in this bay (with a water supply for a standing tub filler) because it was better than batts of insulation in stopping cold air movement, hence preventing freezing.

I thought that blow in foam insulation didn't have a high R value compared to fiberglass. Unless he meant a foam similar to a Great Stuff formula.

What would you use?

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  • Why not contact the plumber and ask him what type he was referring to. Answers could be based on opinions.
    – JACK
    Apr 11 at 15:04
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Based on the word foam I would imagine he means the stuff similar to great stuff which does have a higher R value. Is the pipe partially insulated? I'd be worried about the fact that its directly on the drywall that's next to the un-insulated area. The down side to the foam if something goes wrong you won't be able to get in.

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