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How do I insulate underneath a post and beam house on blocks? Insulating between joists on old house that’s up on blocks. Central Texas. House is two feet off the ground. Joists are 2×10 rough cut cypress, set at approximately 24″ intervals. Do I need a moisture barrier between the top of the insulation and the bottom of the floor? If so, is Kraft facing enough? Or should I staple up a plastic lining before installing the insulation? Wire screening to hold the insulation up?
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I don't know enough about insulating in your climate to give you proper advise, but I would consider using rigid foam insulation between the joists, up tight against the subfloor. Cut it a little narrow and foam it in place. This way you have a nice tight fit, and no cavities for critters large or small.
*Given the obvious space limitations, blow in whatever type of insualtion you preferr.I'm not certain of where you are in Texas, but there are three different climactic zones on the state. Because we are talking about a floor, I am not concerened about where you put the vapor barrier.I would recommend sheeting the bottom of the whole thing with something (foam sheathing, foil faced ISO board, cement board, pt plywood, etc.) Find out what is typical in your area. Tape or caulk seams, make it airtight and then blow it in.I realize you need to be on your back to sheathe it, but at least you won't have to be on your back to insulate it also.-Rob