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Vented and unvented attic space

espy1 | Posted in Green Building Techniques on

We are currently considering foam insulation during the framing phase.

Basically the trusses span over our patio area, approximately 15′ with glulam at bird’s mouth.

When looking at foam they will create a ‘rake wall’ with foam to enclose the attic from top plate to roof decking.

Do we need some sort of venting in this section of the attic (outdoor patio)? It will be an unconditioned space.

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  1. GBA Editor
    Martin Holladay | | #1

    Your question is confusing. I think you are asking whether the attic above an unconditioned outdoor patio needs to be vented. If that is your question, the answer is no.

    -- Martin Holladay

  2. espy1 | | #2

    Correct that was my question.

    I guess the confusing part to me is the truss span is continuous instead of ending at exterior wall and then being rafters over patio.

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