Yet another basement question
First, let me just say THANK YOU for this wonderful resource. The advice and analysis you give here is priceless and it is just a pleasure to read through the posts here.
I am planning to upgrade the insulation in my basement which, unfortunately, was remodeled less than 10 years ago in the “throw up some drywall, shove some fiberglass insulation behind it, and put some carpeting on the floor” style. The house is 100 years old and in Seattle with a slab that is in reasonable condition for its age, but presumably thin and with no vapor barrier or insulation. I think I’ve pretty much decided on my wall insulation scheme, but can’t seem to decide what to do with the floors. I’d rather not leave them bare and am hoping to put down either a cork or engineered hardwood floor. Since I don’t have a ton of headroom to play with, I can’t put down several inches of rigid foam, but would like to put something under the subfloor. My question is, how much would be needed to keep it above the dew point to prevent condensation. I know I don’t need much R value to prevent that, but haven’t been able to come up with a number.
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