How much basement floor insulation?
I have a 60 year old home with a poured concrete foundation and concrete floor in the basement level. I’ve applied XPS foam board to the interior basement walls and I’m now considering insulated subfloor panels but figure I can do the same thing with thicker foamboard and sheets of OSB for less money per sq ft. However the panels seem simple to work with and would be quick and easy and they have drainage grooves that might be helpful, but I’m unsure if half an inch of XPS is enough. Is the convenience of these panels worth the higher price? Or is it just as effective to apply 1″ of XPS (or thicker?) to the floor and cover with OSB, anchored to the floor?
When applying either of these options should the seams and edges be taped, and sealed or should these small gaps be left, to allow moisture vapour to be pulled through the floor assembly by a dehumidifier?
I appreciate any help
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