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Old 04-10-2010, 09:34 AM   #1
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Shed roof insulation


I'm trying to ready an 8'X12' shed into a usable workshop.
An insulation contractor told me that spray foam in the roof would eliminate the need for ventilation and a general contractor told me that rigid foam boards would do the same. I don't have enough head room to provide the ventilation needed and I'm not planning on much heat in cold weather. Just enough to keep things from freezing. Also, there is no ventilation built into this shed.
My question is, what is the best way to insulate this roof at the lowest cost? And, could someone please explain the need or no need of a vapor barrier in this application?
Is this a DIY'er project?

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Old 05-01-2010, 09:24 AM   #2
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Shed roof insulation


Just a bump on this,,,,,, I can't believe no one has an opinion.
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Originally Posted by rcp612 View Post
I'm trying to ready an 8'X12' shed into a usable workshop.
An insulation contractor told me that spray foam in the roof would eliminate the need for ventilation and a general contractor told me that rigid foam boards would do the same. I don't have enough head room to provide the ventilation needed and I'm not planning on much heat in cold weather. Just enough to keep things from freezing. Also, there is no ventilation built into this shed.
My question is, what is the best way to insulate this roof at the lowest cost? And, could someone please explain the need or no need of a vapor barrier in this application?
Is this a DIY'er project?

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Old 05-01-2010, 05:45 PM   #3
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Shed roof insulation


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Originally Posted by rcp612 View Post
Just a bump on this,,,,,, I can't believe no one has an opinion.
Spray or rigid foam, makes no difference, except the spray is much more expensive, but less work!

The cheapest would be to use rigid and do it yourself! If you are hiring a contractor, I would spray as the labor cost would be less!
Using rigid requires cutting and fitting, plus caulking where the rigid meets the rafters. So, you don't want to pay contractors rates for the labor involved!

There, you go! That's my opinion!
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Old 05-01-2010, 06:28 PM   #4
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Shed roof insulation


Keep in mind some roofing shingle makers require ventilation for their warranty. V.B.: http://www.ecohomemagazine.com/energ...gy-claims.aspx

http://www.buildingscience.com/docum...ecommendations

Be safe, Gary
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