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I am building a two story attached one car garage. The upper story is a bedroom. This structure attaches directly to the house along its long dimension of 28 feet. Structure is 12×28’x two stories. So once I have pulled a car inside the unheated garage space(12×28) I will have a warm wall along one side of the garage an a warm ceiling above the car (12×28)bedroom. The warm wall has a vapor barrier on the warm side (not garage side). The ceiling of the garage (2×12) has glued and nailed t/g plywood and will have a hardwood floor. Should I put a vapor barrier on the warm wall warm ceiling? I have insulated it with fiberglass and was going to apply the vapor barrier more to prevent fumes from entering the living space but I’ concerned that with a vapor barrier on both side I may trap condensing moisture that really can’t escape very well. Thanks for any insight.
I live in Iowa. Patrick
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Replies
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Put the vapor barrier underneath the sheathing on the bedroom side of the garage ceiling and remove the vapor barrier under the garage ceiling finish. Don't use a vapor barrier on both sides.
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I am building a two story attached one car garage. The upper story is a bedroom. This structure attaches directly to the house along its long dimension of 28 feet. Structure is 12x28'x two stories. So once I have pulled a car inside the unheated garage space(12x28) I will have a warm wall along one side of the garage an a warm ceiling above the car (12x28)bedroom. The warm wall has a vapor barrier on the warm side (not garage side). The ceiling of the garage (2x12) has glued and nailed t/g plywood and will have a hardwood floor. Should I put a vapor barrier on the warm wall warm ceiling? I have insulated it with fiberglass and was going to apply the vapor barrier more to prevent fumes from entering the living space but I' concerned that with a vapor barrier on both side I may trap condensing moisture that really can't escape very well. Thanks for any insight.
I live in Iowa. Patrick