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  1. #1
    Join Date
    Mar 2012
    Posts
    1

    Default Insulation below subfloor

    I'm putting hardwood floors in my daughter's bedroom. Her room is just above the garage and is terrible cold during the winter.

    I'm thinking since I have the subfloor exposed and the room gutted, about taking it up (the subfloor) and adding insulation between the floor joists. Thinking that it would be easier this way rather then taking the ceilintg down in the garage and adding the insulation that way.

    Is this a good idea? Am I missing something???

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: Insulation below subfloor

    Good idea. what about a vapor barrier? Where do you live? Bucks CO PA ?(former resident of Huntingdon Valley myself)
    Last edited by HoustonRemodeler; 03-18-2012 at 03:39 PM.

  3. #3
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: Insulation below subfloor

    Howdy, terrible cold floor, yikes. Easier then pulling floor and installing foam is to remove the ceiling and insulation. Then have 2" closed foam spray applied then filling rest of cavity with fiberglass bats& re dry walling with 5/8". The foam not only will make a huge comfort difference. Best is it seals out any auto off gassing that can leak into the house. The foam is $$ but decreased utility bills - or doctor bills is a great plus.
    Any an all of my comments are just my opinion and not to be confused with facts.

  4. #4
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: Insulation below subfloor

    Also with the ceiling cavity open you can foam any HVAC duct pipe to insulate it makes a huge difference too.
    Any an all of my comments are just my opinion and not to be confused with facts.

  5. #5
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Insulation below subfloor

    Quote Originally Posted by Bucks County Bruce View Post
    I'm putting hardwood floors in my daughter's bedroom. Her room is just above the garage and is terrible cold during the winter.

    I'm thinking since I have the subfloor exposed and the room gutted, about taking it up (the subfloor) and adding insulation between the floor joists. Thinking that it would be easier this way rather then taking the ceilintg down in the garage and adding the insulation that way.

    Is this a good idea? Am I missing something???
    Depending on quick you complete the task it may not be a good idea. Otherwise your daughter may be out her her room longer than anyone wants.

    Rooms above garages being cold is probably the number one complaint.
    There usually are inadequate insulating, air sealing and heat supply deficiencies found to be cause in the space under the floor.

    As Timothy posted the better way is to remove the ceiling in the garage and correct the issues from there. This is also the least disruptive for your daughter.
    The most effective method is indeed using closed cell spray foam applied to the underside of the floor and to seal any penetrations to the outside preventing cold air movement.
    Also, to prevent any emmissions from car exhaust reaching the living space above.
    This will also allow you to evaluate the the heat supply that may likely be running in that space and correct if need be.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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