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Old 03-09-2014, 04:31 AM   #1
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Framing Subfloor Over Hardwood


On my raised foundation house the previous homeowner remodeled an extra room by basically making a new doorway in an exterior wall which enters into the new addition. The subfloor on the addition is a slab with hardwood installed over it. The floor in the remodeled room is about 8 inches below the existing floor and I would like to raise it to the same height.

I would like some advice on how to go about framing the subfloor which would sit on top of the hardwood flooring. My thoughts are to nail a 2x members to the walls then run joists which would basically sit on the hardwood and shim it if needed. The room is well insulated so I don't think I would have any issues with moisture. I'm afraid of installing a moisture barrier on the hardwood because that could cause the hardwood is rot. I'd rather have the moisture move through the floor.. I'd like your thoughts on this.
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Old 03-09-2014, 06:13 AM   #2
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You plan sounds ok.
My main concern would be if that addition was built on top of an old slab and it was pored right on grade.
The concern being water being able to get in under the walls.
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Old 03-09-2014, 08:02 AM   #3
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seephor...This is where it helps to put in your location....the best solution is very dependent on where you live.
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Old 03-11-2014, 02:47 AM   #4
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Thanks for the reply guys. I checked today and it looks like they poured about 3" of concrete on top of the existing patio concrete. So it's 3" off the water level.

My location is in Southern California Los Angeles area. I measured today and it looks like I need to raise the floor 8" so 2x8 joists would be perfect which gives me 1/2" space under them which I can shim for added support.

I'm going to install a 3/4" plywood subfloor now my question is should I do 16" OC spacing or can I get away with 24" OC?

I also think it would be a good idea to install some fiberglass insulation between the joists mainly for noise reduction. Any concerns with that?
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