My attached garage is a cold space below a bedroom. The second storey bedroom floor is heated by radiant floor heating. THis is basically hot water hoses attached under the floor using aluminum plates (seen in attached picture).
I need to insulate the ceiling and plan to use r20 batts 6 inches thick. My 2 questions: 1) how much of a space should I allow between the batt and hoses. I'm thinking just a few inches so would push batt up to bottom of top 2 x 4 of ceiling joist. 2) do I need a vapour barrier between the top of the batt and the hoses running between the joists. I think not given that its going to be a heated space but want to be sure. If I do need a barrier I'm unsure where/ how to install it.
A batt insulation would work best as if you ever had a leak it would show vs open cell spray foam ,, install the insulation with the foil facing up , and you need to pack out the ends of the beam space , creating a convection box ,, if you don't pack the ends all the heat will escape from there . I would not recommend a vapor barrier , however use due diligence choosing your wood and make sure it's compatible , as well as fully acclimated onsite.
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