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Rain Guard: French Doors An inswing exterior door has two serious weather proofing problems. One, the threshold can't turn up behind the inside face of the door because it must swing open in that direction. Two, the face of the door must be in the same plane as the interior wall so the door can be hinged to swing freely past 90 degrees. That requires a larger sloped exterior threshold extension (or sill) so it can project beyond the exterior face of the house and water can drip from it instead of running over the sill nose and get pulled back into the house by wind and capillary action. (Obviously, sealing the space below the threshold is also necessary.) You would think these problems would be well understood by carpenters but too often they are not. The threshold shown below allows the interior upturn to be raised until it fits tightly against the weather stripping on the bottom of the door. The interior (left) side seems high but a threshold is supposed to sit on the sub-floor and the finish flooring (or underlayment if there is carpet or tile) is added so it stops against the threshold.