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Thread: Spray Foam insulation with Recess lights: Question

  1. #11
    Join Date
    Apr 2007
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    Quote Originally Posted by doc12 View Post
    Hi Folks,

    Working on a new house where they are spray foaming walls and ceilings. Customer wants recessed cans in the cathedral ceilings which are getting foamed as well. Reading an article from Cooper lighting indicates foam should be kept away by 3 inches. Any suggestions and or code issues as to how to protect the cans ? The foam guys could care less and will spray everything!!!

    Thanks,
    T
    'taint gonna be pretty, but it'll work.....

    cut some drywall to fit between joists, and block the things out,
    so there is a void.
    put some drywall squares over the cans to keep the goop out.
    screw them down. the cans should flex up enough into the void
    to let the drywall seal against the joists.

    after commander spray foam is done, pull the covers off. you now
    have a void around the light.

    if the owners are nuts about having a pretty IR scan at the end of
    the day, pack fiberglass insulation around the cans.

    don't forget to charge extra for this.
    ~New signature under construction.~
    ~~~~Please excuse the mess.~~~~

  2. #12
    Join Date
    May 2014
    Location
    Marlborough, Massachusetts USA
    Posts
    195
    Quote Originally Posted by Fulthrotl View Post
    'taint gonna be pretty, but it'll work.....

    cut some drywall to fit between joists, and block the things out,
    so there is a void.
    put some drywall squares over the cans to keep the goop out.
    screw them down. the cans should flex up enough into the void
    to let the drywall seal against the joists.

    after commander spray foam is done, pull the covers off. you now
    have a void around the light.

    if the owners are nuts about having a pretty IR scan at the end of
    the day, pack fiberglass insulation around the cans.

    don't forget to charge extra for this.

  3. #13
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
    Posts
    32,248
    The problem is access to the box. Either block the can with 2x ? (rafter size) use the slope ceiling can where you can access the jb from inside the can. That is the issue.

    Golddigger- cathedral ceiling doesn't necessarily mean exposed rafters but rather a sloped ceiling with insulation and sheetrock.
    They say I shot a man named Gray and took his wife to Italy
    She inherited a million bucks and when she died it came to me
    I can't help it if I'm lucky



  4. #14
    Join Date
    Apr 2006
    Location
    Springfield, MA, USA
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    2,971
    How much insulation will be left in this ceiling/under the roof where these fixtures will be, especially with the blocking to keep foam away from the fixtures?

    Poorly insulated areas in otherwise well insulated walls can have strange problems with condensation and temperature differences on the walls.

    -Jon

  5. #15
    Join Date
    Dec 2013
    Location
    Kansas Cty, Mo, USA
    Posts
    454
    Quote Originally Posted by Fulthrotl View Post
    'taint gonna be pretty, but it'll work.....

    cut some drywall to fit between joists, and block the things out,
    so there is a void.
    put some drywall squares over the cans to keep the goop out.
    screw them down. the cans should flex up enough into the void
    to let the drywall seal against the joists.

    after commander spray foam is done, pull the covers off. you now
    have a void around the light.

    if the owners are nuts about having a pretty IR scan at the end of
    the day, pack fiberglass insulation around the cans.

    don't forget to charge extra for this.
    And use shallow cans to give more room above it for foam

  6. #16
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    33,105
    Quote Originally Posted by winnie View Post
    How much insulation will be left in this ceiling/under the roof where these fixtures will be, especially with the blocking to keep foam away from the fixtures?

    Poorly insulated areas in otherwise well insulated walls can have strange problems with condensation and temperature differences on the walls.

    -Jon
    And in places where it gets cold enough, those mornings when there is frost on the roof you can see from outside exactly where every light can is located - those are the round spots with no frost on them.

  7. #17
    Join Date
    Feb 2003
    Location
    San Jose, CA
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    1,426
    Spray foam is becoming pretty common on projects I have been working on the past couple of years. On the jobs I have seen after insulation but before rock the insulators have packed fiberglass bat insulation above and around the cans. This keeps the foam from contacting the can.

    The last thing you want is for them to foam above the can. It will push the can out of the ceiling.
    Curt Swartz
    Electrical Contractor

  8. #18
    Join Date
    Oct 2007
    Location
    New Jersey
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    Quote Originally Posted by curt swartz View Post
    Spray foam is becoming pretty common on projects I have been working on the past couple of years. On the jobs I have seen after insulation but before rock the insulators have packed fiberglass bat insulation above and around the cans. This keeps the foam from contacting the can.

    The last thing you want is for them to foam above the can. It will push the can out of the ceiling.
    I was wondering about that.

  9. #19
    Join Date
    Feb 2013
    Location
    Aspen, Colo
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    Quote Originally Posted by curt swartz View Post
    Spray foam is becoming pretty common on projects I have been working on the past couple of years. On the jobs I have seen after insulation but before rock the insulators have packed fiberglass bat insulation above and around the cans. This keeps the foam from contacting the can.

    The last thing you want is for them to foam above the can. It will push the can out of the ceiling.
    I've seen more "not in contact with spray foam" but never 3" away -- The batts for separation IMO are ok for IC cans to contact with -- If the ceiling framing can be inspected & foamed prior to sub trades material install that works well.
    CircuitRyder --- Unfortunately not all good ideas are code enforceable.

  10. #20
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    Quote Originally Posted by gadfly56 View Post
    I was wondering about that.
    nothing to wonder about. there is no doubt about it.
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    ~~~~Please excuse the mess.~~~~

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