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    Howie628's Avatar
    Howie628 Posts: 40, Reputation: 1
    Junior Member
    		  
    #1

    Feb 23, 2010, 10:40 AM
    Insulation between floors?
    I am finishing out a basement. The floor of the upstairs is insulated with R-11. I have lowered the ceiling downstairs to 9 feet in most of the area and to 8 feet in the area below the upstairs plumbing(to allow a crawl space to access the plumbing) The space between the floors will then be 2 feet and three feet respectively. I have studded the ceiling out and am putting up 3/8" sheetrock. Is it necessary to put insulation in the ceiling of the downstairs since the floor of the upstairs is insulated? Thanks for your help.
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
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    #2

    Feb 23, 2010, 02:23 PM

    Welcome Howie

    Usually don't insulate between heated areas. If using for sound proofing, use unfoiled insulation.

    Would also think about using 1/2'' s/r. 3/8'' s/r is usually used as a backer for paneling.

    Over time the 3/8 s/r may become wavy between studding.

    Chuck
    Howie628's Avatar
    Howie628 Posts: 40, Reputation: 1
    Junior Member
    		  
    #3

    Feb 23, 2010, 04:15 PM

    Thank you Chuck. I will increase the 3/8 to 1/2 per your advisement. With the insulation already in the floor of the area above and using 1/2" sheet rock on the ceiling, would you think that would be decent sound proofing between the two floors? Also... I have insulated between the studs in the exterior walls using R-13 with vapor barrier. Should the walls in the space between the two floors be insulated. Right now it is bare cinderblock. Thanks again.
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
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    #4

    Feb 23, 2010, 09:24 PM

    All outside walls should be insulated. This will help with heating and inhibit moisture transfer. If u leave these spaces without insulation, u could get condensation.

    Chuck
    leifweaver's Avatar
    leifweaver Posts: 39, Reputation: 11
    Junior Member
    		  
    #5

    Feb 23, 2010, 10:59 PM

    I can not tell from your post, but the basement floor ought to be insulated if you can, otherwise, you will loose a surprising amount of heat through the floor and you can have condensation form between the slab and any floor finish that you are putting down.
    Howie628's Avatar
    Howie628 Posts: 40, Reputation: 1
    Junior Member
    		  
    #6

    Feb 24, 2010, 04:34 AM

    Planning on putting down floating floor with the foam underlayment.Will this qualify as inulating or should I put something down prior to that?
    Howie628's Avatar
    Howie628 Posts: 40, Reputation: 1
    Junior Member
    		  
    #7

    Mar 9, 2010, 11:50 AM

    Hey Chuck or Leif,

    If I put pink foambaord insulation on the outside walls between the two floors, does it also have to be covered with a vapor barrier or some other material? Thanks.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #8

    Mar 10, 2010, 07:48 PM

    All outside wall insulation needs a vapor barrier on the warm side, even foam. I'd go so far as to lay foam board down on the floor, tape it and then install your floating floor.
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