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Community and Q&A

Exterior door threshold/rainscreen Q

kevinjm4 | Posted in General Questions on

Is there a rule of thumb when selecting the threshold depth for exterior doors that will be going in a rain screened house? There are a number of different standard sizes you can buy as well as custom or extendable from what I’m seeing. I’ve never shopped around for these before. Basically I’m wondering is there a spot a threshold should land/terminate in relation to the trim or siding?

if it matters my wall is constructed with 1/2” drywall, 2×4 studs, 1” sheathing (or 1/2” sheathing depending on which side of the house you are working on), 3/4” furring, 1/4” Hardie panel, 3/4” (1x) trim sits on top of siding not butted into siding.

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  1. Expert Member
    Michael Maines | | #1

    Unless the walls are extra-thick, I order the door jambs to be the full thickness of the wall, from interior side of drywall (or other finish) to the outside of the rain screen/back of exterior casing. The sill typically projects an additional inch to cover an apron or kick board, though it's often a bit short when using 5/4 casing, so I'll either use a 3/4" kick board or taper the top of the board.

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