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Thread: basement bathroom and utility room floor insulation

  1. #1
    DIY Senior Member diyfun's Avatar
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    Default basement bathroom and utility room floor insulation

    My basement is big (1600sqft). It is open space and bare to concrete wall and floor now. we have a bathroom there and plan to have a utility room as well. The gas boiler and hot water tank are in that area already. I added French drain around the wall and a sump pump last winter in case the 500yr flooding comes earlier. I have put two floor drains (one in bathroom and one in utility area) and three cleanouts with the French drain system to make sure water will have a good place to go if any.

    I will follow suggestions from experts here to finish the basement. For the floor, i have a bathroom and a planned utility room, and also have floor drains and cleanouts on the floor. how should I handle them?

    The floor will be insulated like this: 6mil ploy + 1" XPS foam board + 3/4 plywood.

    1. utility room: I plan to have a separated utility room; seal poured concrete wall and floor with XYPEY. Because the pipes for air, water and gas have been there already, it is hard to do insulation in that portion. I lean to have no insulation on the wall and floor for that utility room.

    2. bathroom: should I insulate the bathroom floor as other rooms?

    3. floor drain and French drain cleanouts: should I make those floor drain and cleanouts available after the insulation? if yes, that means the insulation is nor sealed properly. If no, ...

    What's your advice?
    Last edited by diyfun; 12-24-2011 at 01:05 PM.

  2. #2
    DIY Senior Member dlarrivee's Avatar
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    What is the purpose of the 6mil?

  3. #3
    DIY Senior Member diyfun's Avatar
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    Quote Originally Posted by dlarrivee View Post
    What is the purpose of the 6mil?
    vapor barrier, I think.

  4. #4
    In the trades Dana's Avatar
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    With an inch of XPS on the floor and a sealed slab the 6 mil poly isn't essential, but it doesn't hurt.

    DO make the drains & cleanouts accessible. The exposed surface area that would be exposing (and then not vapor sealed) is very small and of no consequence. Concentrate on air-sealing- infiltration from the outside is a far larger source of moisture than a few square feet of exposure to sumps & drains.

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