I bought a house in SW FL with a metal shop building. It's a carport style building with horizontal siding/roofing, uninsulated.
The 2 1/4" square tubing trusses, have a lower chord, that I would like to attach a ceiling to. (Under the truss lower chord)
I would then put insulation on top of the ceiling.
Do I need to put in a vapor barrier, and if so where?
One thought was to put the vapor barrier on the bottom of the lower truss chords, and put the ceiling (metal) under the barrier.
If I only wanted to insulate 1/2 of the building, with the dropped ceiling, Would the vapor barrier do anything, with the roof over the enclosed area, being open to the uninsulated part of the building?
Spray foam in out of the budget.
Thoughts on this?
Cliff Farman
2014-10-18 21:40:20.000000
Are you going to condition the space?
Vapor retarder levels should go to the warm side in in FL, that is the exterior wall/roof/etc.
If you are not going to condition, don't worry about it as you won't have cool enough interior temps to create a condensing surface in a majority of the situations.
I would look at some foil faced rigid foam to help reject some of the radiant heat.
Is the roof vented?
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