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Thread: Vapor Barrier for steel building

  1. #1

    Vapor Barrier for steel building

    Hello -

    I just got a quote from an insulation company to put fiberglass batting into my steel building workshop (in the Pacific Northwest). They suggested putting just the plain fiberglass right up against the steel then putting in the vapor barrier on top of it - facing the inside of the shop.

    Does that sound right? I feel like I have read different takes on that online. Will condensation occur on the steel side if done this way?

    Also - the ceiling currently has a vapor barrier installed up against the steel and behind the wood purlins. They wanted to slice those out, then stuff the fiberglass in place, then put the vapor barrier on top facing into the shop. Is that a good idea? The guy said that you definitely don't want 2 vapor barriers up there, and it's better to have it shop-facing after the fiberglass.

    Anyhow - just looking to see if this is the correct way to install!
    Thanks

  2. #2
    Join Date
    Apr 2016
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    That's the way it is done in steel buildings. The insulation guys know what they are doing. Cheers

  3. #3
    Vapor barrier goes on the warm side, like the insulation guy says.

  4. #4
    Join Date
    Apr 2008
    Location
    River Falls WI
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    Or do spray foam, which does both. That is what many do here in WI & MN. Dan

  5. #5
    Quote Originally Posted by Dan Rude View Post
    Or do spray foam, which does both. That is what many do here in WI & MN. Dan
    Yes - I haven't gotten a spray foam quote yet. I have a 2,000 sq. ft. open space for the steel building. A fiberglass batt install on all walls and ceiling was quoted $8,000 - I was thinking that's kind of high enough to consider spray foam!

  6. #6
    Join Date
    Mar 2003
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    SE PA - Central Bucks County
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    Closed cell spray foam adds substantial rigidity to a structure, so in addition to its excellent insulation and vapor barrier properties, it can really enhance the "quality" of the space. Yes, at a price, but it's a "one shot and done" thing, too.
    --

    The most expensive tool is the one you buy "cheaply" and often...

  7. #7
    Join Date
    Jul 2017
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    TX / LA border.. Toledo Bend
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    Last edited by Marc Jeske; 05-14-2018 at 12:29 AM.
    I'm pretty new here, not as as experienced as most. Please don't hesitate to correct me

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