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Detail for innie inswing door with thick exterior foam?

John Ranson | Posted in Green Building Techniques on

I’m planning a house for Rochester, NY, zone 5. The wall have 2×6 studs, 7/16 sheathing / air barrier, 4″ rigid foam, a wrb, a 3/4″ rainscreen, and 3/4″ thick horizontal shiplap siding. The foundation is a monolithic slab on grade with 4″ exterior rigid foam. The finished floor height is 2″ above the slab. There are 4-7′ overhangs over every exterior door.

My general question is, how do I install an innie, inswing exterior door in this assembly?

I want an inswing door because it can’t be blocked by a snow drift.

Here are a few specific questions:

How do you support the sill where it extends over the foam?

How do you flash the opening so that water can’t get behind the wrb?

How do you trim out the opening?



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  1. User avatar GBA Editor
    Martin Holladay | | #1

    This question comes up frequently on GBA. One useful resource is this article by Rachel Wagner: Windows and Doors in Double-Stud Walls. The detail reproduced below illustrates the "frame-within-a-frame" approach that allows inswing doors to be installed in a thick wall.

    You may also want to read these previous Q&A threads on the topic:

    Extension jambs for in-swing doors on double wall construction?

    Outie doors

    Exterior door details with 4" thick foam walls

    "Innie" Doors?

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