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Shed roof attachment to a wall with exterior insulation

ironwoodstudios | Posted in Green Building Techniques on

Good morning all,
I’m interested in your thoughts on the detail of how to attach a roof system to a side wall with the following design details:
2×6 framing with dense-pack cellulose
1/2″ ply
soletex mento WRB
1.5″ roxul comfortboard 80
3/4 furring strips
lap siding.

for the decks and porch I’m hoping to use “Maine Deck brackets”
I’d prefer not to break the exterior insulation shell.

thanks in advance!

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  1. GBA Editor
    Martin Holladay | | #1

    The tops of the shed roof rafters are going to need to bear on a horizontal 2x8 or 2x10 -- let's call it a 2x8. This horizontal 2x8 needs to be securely fastened to stand-offs that hold the 2x8 away from the wall sheathing. The 2x8 and the stand-offs -- probably blocks of lumber, but possibly blocks of dense EPS -- need to be securely fastened to the underlying framing.

    If you don't have the confidence to design these stand-offs and the fastening schedule, talk to an engineer.

  2. ironwoodstudios | | #2

    Thank you Martin.

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