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Thread: Vapor barrier boxes

  1. #1
    Join Date
    Aug 2009
    Location
    MASSACHUSETTS
    Posts
    38

    Vapor barrier boxes

    Good evening,

    State of Massachusetts

    I’ve been seeing a lot of these electrical boxes with so called vapor barrier.
    They are plastic boxes guessing for residential use but have a gasket around them. They seem to be very expensive compared to regular plastic boxes. In the state of Massachusetts does anyone know if these are a new code requirement for New residential construction or just a new way for suppliers to increase cost in the industry?

  2. #2
    Join Date
    Nov 2016
    Location
    Boston, MA, USA
    Posts
    11
    https://www.mass.gov/files/documents...p-and-list.pdf




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  3. #3
    Join Date
    Nov 2016
    Location
    Boston, MA, USA
    Posts
    11
    Not new at all, and not a ploy— it’s just a lot of cities/towns haven’t adopted stretch code.


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  4. #4
    Join Date
    Feb 2003
    Location
    New Jersey
    Posts
    3,746
    Just a side bar, they’re not a bad idea and I don’t have a problem using them. However, there are some instances (like kitchens) where I like to use adjustable boxes because the back-splashes are usually tiled. Using extension collars can sometimes be a real PITA.

    That said, I’m told by some of my colleagues that there are some towns here in NJ that are requiring them. Not sure what Code they are citing but some EI’s like to find obscure Codes just to break chops

  5. #5
    Join Date
    Dec 2010
    Posts
    1,427
    It's from the IECC.

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    The more they overthink the plumbing, the easier it is to stop up the drain

  6. #6
    Join Date
    Feb 2003
    Location
    New Jersey
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    3,746
    There’s the obscure Code !!! It’s hard enough trying to keep up with the NEC and then an EI finds this one just to let you know he’s “up on the Codes”.

  7. #7
    Join Date
    Dec 2010
    Posts
    1,427
    Quote Originally Posted by goldstar View Post
    There’s the obscure Code !!! It’s hard enough trying to keep up with the NEC and then an EI finds this one just to let you know he’s “up on the Codes”.
    That's PE.
    The more they overthink the plumbing, the easier it is to stop up the drain

  8. #8
    Join Date
    May 2014
    Location
    Marlborough, Massachusetts USA
    Posts
    289
    My experience so far in Massachusetts vapor barrier boxes are not required in remodels ( I'm not talking additions) and where closed cell spray foam in used.

  9. #9
    Join Date
    Aug 2009
    Location
    MASSACHUSETTS
    Posts
    38
    Quote Originally Posted by Knuckle Dragger View Post
    My experience so far in Massachusetts vapor barrier boxes are not required in remodels ( I'm not talking additions) and where closed cell spray foam in used.

    My application would be for a new construction home.

  10. #10
    Join Date
    May 2014
    Location
    Marlborough, Massachusetts USA
    Posts
    289
    Quote Originally Posted by pmoney44 View Post
    My application would be for a new construction home.
    If the GC is using closed cell spray foam insulation in the walls when you don't need vapor barrier boxes. If they are using fiberglass then you will need vapor barrier boxes.

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