Low-profile way to fasten insulated copper tubing

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Rossn, Mar 30, 2021.

  1. Rossn

    Rossn Member

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    Dec 12, 2017
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    Denver, CO
    I have a number of copper plumbing runs (city supply, well, irrigation, dhw & recirc, etc) that I need to attach to the underside of the joists, and will furr down the ceiling 2". Several runs will be insulated... ideally continuously.

    What is the best low-profile, acceptable way to attach the continuously insulated runs (several adjacent to each other)? Can I use strapping (galvanized or plastic) over the top of the insulation, with or without a full wrap?
     
  2. James Henry

    James Henry In the Trades

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  4. Rossn

    Rossn Member

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    Thank you. I see one clip option at supplyhose. However, I only have 2.25" to fit the plumbing with insulation and also a 16 gauge piece of steel as a nail plate. 3 of these lines are 1" Copper, and that sheet shows the distance it hangs down as 1.9", and then I have another 1/2" of insulation + nail plate. I would like it to look profession did it, also have the space limitation.
     
  5. fitter30

    fitter30 Well-Known Member

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    1/2" covering is 1" + the pipe od. One or two hole conduit clamp take some thin aluminum flashing ( roof dept) form it over bottom half of pipe 12" long to spread out the weight not to crusn covering.
     
  6. Rossn

    Rossn Member

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    Dec 12, 2017
    Location:
    Denver, CO
    Yes, though I am saying the clip hanger has a depth that includes all but one side of the insulation, and with that, it would come to 2.4"+steel, which is greater than the 2-1/4" I have to work with. Yes, the tubing+insulation does fit, in itself. Help me understand the purpose of the aluminum flashing? Just to prevent damage to the insulation?

    Is it a notably bad idea to just use strapping across the insulated tubing?

    Since I have to put some steel on the underside, where I have 3 runs ganged side-by-side, maybe I just cut some 12"x6" 16-gauage steel and use that at intervals, screwing through it, and into the joists... basically a sandwich. Again, maybe not conventional enough to be acceptable; almost like a cable raceway.
     
  7. wwhitney

    wwhitney Well-Known Member

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    Mar 17, 2019
    Location:
    Berkeley, CA
    Having a larger area of contact will reduce insulation crushing. You could take a look at the fabric webbing used for securing insulated ducts. Non standard but I don't see a problem.

    Cheers, Wayne
     
  8. Rossn

    Rossn Member

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    Dec 12, 2017
    Location:
    Denver, CO
    Agreed on the larger area for insulation compression... that said more than 1.5" wide doesn't help much, given the joists are 1.5" wide. For plumbing products, Oatley makes this 1-1/2" strapping (a bit rigid). I'm assuming that despite being copper tubing, the insulation separation would make it OK with inspectors to use this steel strapping.

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