DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Bricks, Masonry and Concrete > Best way to insulate concrete slab




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Old 12-12-2009, 05:34 PM  
cibula11
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I need to use joists because I will be installing plumbing and need the space for drain pipes to be run. So, yes...I'm talking about joists.

Ideally, I 'd like to run the joists right on the floor and shim in areas where the garage floor slopes down.

If this is the case, you're saying that the best way would be to lay the 6 mm poly and then joists across (with ledger) and then insulation batt or blow in between the joists (which would essentially fall directly onto the plastic)?? Or with joists could I still use the rigid foam underneath the joists?



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Old 12-13-2009, 06:37 AM  
inspectorD
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Plastic down, foam board, then joists with the ledger...just like the one Joe Listbureck recommends. And attach, seal, the plastic to the bottom plate if it is PT wood to keep the moisture from the concrete out.
I think your ready, have fun.



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Old 01-03-2010, 07:01 PM  
cibula11
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I'm back

I was planning on running a ledger on opposite walls to essentially "hang" the flooring. However, one wall is the extension of the home's foundation and the ledger would need to be attached to concrete block. I'm guessing it's hollow block. Is there a way to do this )the floor will need strength since it will have a bathtub)

I suppose I could resort to placing the joists directly on the concrete and shimming, but Id like to get the rigid insulation added on the concrete floor and I'm not sure I could do that with this method.

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Old 01-14-2010, 05:27 PM  
GaTomCat
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be sure to use treated floor joist..

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