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Old 02-18-2011, 11:35 PM   #1
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Insulating a garage

So I have a detached garage that I would like to insulate and provide heat / ac to. I would prefer not to finish off the ceiling as I would like to have shelving run up between the rafters for storage.

What is the best way to insulate the building? The spray on foam looks like a great idea, but how does that work with airflow on the roof since it attaches itself directly to the decking (OSB in this case)? I don't want moisture rotting away the roof from lack of airflow.

And on the walls, would I still need to put a vapor barrier / drywall? Or will this insulation be enough to get the job done?

I guess I'm trying to figure out all of my possible options in this situation.

How do roof vents (and attic vents) work if you are heating / cooling the entire space?

Sorry about all of the questions, but it just seems with every Google search, I get a dozen different answers to each question and each answer leads to a whole new question.
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Old 02-18-2011, 11:56 PM   #2
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Check with your local Building Department on conditioned roofs;

Where are you located? As to insulation thickness, find your Zone, on map or below in closest city;

Then use that Zone for thickness required;

Rafter insulation required thickness;

Foam board and sprayed foam require a fire covering such as 1/2" drywall. The vapor barrier depends on location also;


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