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What is a code-approved way to secure copper pipe to metal framing members which minimizes heat transfer and potential reactivity between the two different metals?

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You use plastic bushings. I couldn't find a photo with pipe, but here's one with electrical:

enter image description here

This gives you the benefit of separation of materials and also a 'slip joint' to handle the expansion/contraction of pipes so they're not making lots of noises rubbing against framing members.

To attach the pipe to the stud, you can use pipe clamps like this:

enter image description here

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    I think the OP wants to secure the pipe to the metal stud, not just pass through it. Some rigidity may be needed.
    – bib
    Jun 22, 2015 at 23:46
  • @bib oh, good call! I'll update the answer.
    – DA01
    Jun 23, 2015 at 0:55

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