Vapor barriers and Insulation
Hello again! I have a question for everyone. I have spent the last week researching this before asking and here I find myself very confused. I live in zone 2 central Florida, my home is cmu block 8” thick. I have r board 3/4” thick installed on the inside of the block wall. I have furring installed over that. All seams are taped and 1/2 drywall will go over this. Now, I want to put the same r board 3/4” on the exterior of my block. I am putting hardie panels up as board and batten siding. The hardie panels are being installed on 1/4 furring that is t nailed to the block. Do I need a vapor barrier too? The home has a unvented roof with open cell spray foam on the back side of the roof sheathing which is osb. Then tiger paw, purloins 3/4” and metal roof on that. I have fresh air supply’s for my hvac. Any issue with the foam board on both sides of the block?? Can’t seem to find an answer on that.
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