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insulation

Discussion in 'Plumbing Codes' started by ICE, Jul 11, 2019 at 7:26 PM.

  1. ICE

    ICE Sawhorse

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    We require that a goodly amount of water pipe be insulated.

    The insulation on the right is a tight fit. The contractor used the insulation on the left which is loose. An inspector wrote a correction to replace the loose insulation with the tight fit insulation. I'm not the guy for insulation code and this other inspector is a plumbing guru whereas I'm lucky if I hit the bowl.

    So what do you guys think about this? Was it worth making them do it over. My first reaction was..... Hey now, the tight insulation has a thermal bridge and the loose insulation barely touches the pipe. Honestly, I would have never noticed.

    [​IMG]
     
  2. linnrg

    linnrg Sawhorse

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    trapped air is somewhat of an insulator
     
  3. HForester

    HForester Member

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    It is a workmanship issue. I suppose you could really step into it and get the insulation manufacturer involved to ask the question, "does this product, as installed, provide for R3 insulating properties on the pipe? (R3 is just an example requirement.)
     
  4. Rick18071

    Rick18071 Sawhorse

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    Are there manufacturers installation requirements?
     
  5. Inspector Gift

    Inspector Gift Sawhorse - Made in USA

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    What code section did the inspector cite?
     
  6. jeffc

    jeffc Bronze Member

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    Washington State requires R-3 pipe insulation for freeze protection. When I contacted the manufacturer asking about the pipe wrap r-value, she replied with:

    R value on item 3/4"- #P11X - 2.1 and 1" -P12X - 2.0.

    Thank you

    Cheryl

    Thermwell Products

    201-684-4400

    Interested in hearing someone tell you, "that is what we always use", ask about the pipe wrap r-value.
     
    #6 jeffc, Jul 12, 2019 at 11:28 AM
    Last edited: Jul 12, 2019 at 11:57 AM
  7. mtlogcabin

    mtlogcabin Sawhorse

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  8. Sleepy

    Sleepy Registered User

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    I've always thought the insulation was to prevent condensation on the outside of the pipe and would imagine that if the insulation isn't snug to the pipe it wouldn't work for that purpose.
     
  9. mtlogcabin

    mtlogcabin Sawhorse

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    In general, the outside diameter of a copper pipe will be 1/8” bigger than its nominal width. Plastic pipes will be 3/8” bigger, and cast iron pipes will be ¼” bigger. To derive the nominal width, you need to know what the pipe is made of and then subtract the correct amount.
     

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