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Old 02-09-2014, 09:13 PM  
nealtw
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It depends on the part of the contry you live in. Where I am, you would not have plywood below the overhang floor. You would have solid blocking wood or foam to stop air flow from basement into over hand then you would use batt insulation and below that use vented soffet if it can be seen or a chiken wire to hold it up there and keep critters out.
Check with the local building inpection dept. see what is right for your area.



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Old 03-01-2014, 04:37 PM  
Dangros
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I live in northern VA - Reston/Fairfax County to be exact. It's been in the 20's lately and the kitchen floor is brutally cold. The previous owner decided to install a gas stove in the kitchen in order to heat it up but I really dont like using it for several reasons - main one being that it doesnt vent to the outdoors so we get the fumes.
The house is on a slope so the beginning of the extension is about 4' off the ground and the end is about 6' off the ground. It's easily accessible and totally exposed to the air outside.
I was thinking of pulling the plywood down, removing the useless insulation, foam sealing the cracks and crevices, then installing 2" foam insulation between the joists - cutting them to fit and sealing to make airtight w/foam between the joists. THEN replacing the plywood and, again, sealing cracks w/foam.
OR I was wondering if I could just put the 2" foam on top of the plywood and seal it so no air gets through?



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Old 03-02-2014, 01:15 PM  
guyod
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Sounds good except the 2" foam insulation. In my area you need R30 insulation in the floor.

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Old 03-02-2014, 03:58 PM  
nealtw
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I would fill the cavities with snug fitting fibreglass. Any holes thru the floor for wiring or plumbing should be filled with fire rated caulk.
I wouldn't seal the lower plywood , there should be some airflow on the out side of the insulation anyway.

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