Threshold Extension for Exterior Door in Extra-Thick Wall
The house I am renovating will end up with 11″ thick walls (1/2″drywall, 5 1/2″ studs, 1/2″ sheathing, 2 1/2″ polyiso, 1″ rain screen, 1″ board siding).
Are threshold extensions available that I can fit underneath an existing threshold on a pre-hung exterior door? Or, am I better off making my own threshold?
I looked in the archives and found a similar question from 2013 and it didn’t seem that at that time there was anything commercially available.
I have a press brake and can fabricate an extension if needed and also have a woodshop, so I can easily make a hardwood threshold, but would like to know what might be available commercially before going the homegrown route.
For appearance sake in the house, I need the doors to be in-swing and to mount on the inside edge of the door jambs. From the interior, the appearance needs to be as conventional as possible. I will probably add a storm door on the exterior to manage the appearance on that side.
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