A guy who designs most all the houses my friend builds always does this. For houses with basements, with joist-framed decks atop the poured walls, on elevations that have entrances at grade, foundation walls are brought up to 2-1/4″ under rough floor. Walls are capped with 2×6 mudsills aligned to the inside foundation wall face, and floor joists are connected using topmount hangers to the mudsill. A 2x cleat is tapcon’d to the wall at the outboard edge, providing edge nailer for the subfloor and wallplates, and for the attachment of 2x trim under protruding door thresholds. He typically runs 1″ bluestone pavers right up to but against the 2x threshold trim, close up under, for a minimal step at entry. He, the designer, hates the idea of a step up into the front doorway.
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That sounds like a good idea for handicap access too... how does he handle the flashing? Would a 90 with a door pan on top work in that situation or would it be too close to level? Maybe need a 90 with a slight return up under the threshold huh? How does the architect detail it, the splash at that area may be an issue without the 6" to grade?
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A 90 with a pan on top (jamsill guard is a good one) works fine. This guy doesn't do a front entrance or a terrace entrance unless it is way back in under a porch or canopy. He subscribes to the roman villa theory. Guests should just walk in over a minimal step. Since he wants to bring subgrade (gravel, fill) up close to the thresholds he doesn't want it bearing against a band joist, but has the concrete wall deal with it.