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?