Getting the Details Right for an Unvented Roof - Fine Homebuilding

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Editor's Notepad

Editor's Notepad

Getting the Details Right for an Unvented Roof

comments (0) May 24th, 2011 in Blogs
ScottG Scott Gibson, contributing writer

How do you know when insulating your attic with spray foam is a good idea?

Writing in a Q&A post at GreenBuildingAdvisor, Storm is having second thoughts about his decision not to vent the roof. With the standing seam metal roofing already applied, it's too late to add a layer of rigid foam insulation on top of the sheathing, but he wonders whether there are other steps he should consider?

Further Resources

How to Air-Seal an Attic

Airtight Attic Access

Does Fiberglass Still Make Sense?

Then there's the question of the insulation itself. The three contractors he's spoken with all agree that 6 in. of open-cell foam will be enough for this house in Climate Zone 4. Trouble is, that's well below the amount of insulation required by code, and the plan raises questions about the risk of condensation on the bottom of the sheathing.

Those issues are at the heart of this week's Q&A Spotlight.


Read the whole article at Green Building Advisor.



posted in: Blogs, energy efficiency, insulation, roofs, attic

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