Windows & Doors in Whittier: Rain Off the Threshold
Patio doors for Whittier homes, with the patio sloped, the threshold set and drainage detailed so rain runs away from the new door.
Rain on a patio has to leave by a path that is not under the door. A new glass door in a Whittier house sits near the patio surface, so the slab must fall away from the threshold, and the sill needs a drain. Hard rain is the real test of a threshold, so the detail is drawn before the glass is ordered.
The slope outside
The patio surface should fall away from the house at a gentle slope, and the door sill should sit above the finished surface. If the existing concrete tilts the wrong way, it can be cut and re-poured, or a drain channel can be set at the threshold. Downspouts and nearby planters are checked so they do not send water toward the door. A level straight edge shows the answer in a few minutes. Anything that holds water near the sill is moved or redirected.
The sill and the permit
Under the sill goes a pan with raised ends, with flashing lapped over it. Low thresholds are made with a drain channel and a sloped lip, which keeps the floor flush while the water stays outside. The city building department reviews the opening and inspects the flashing before the wall is closed. A like-for-like window swap needs less paperwork than a widened opening. Seals are checked at the corners of the pan, since corners are where leaks begin. A hose test on the finished threshold shows whether the detail works before the trim goes on.
Windows & Doors in Whittier: what people ask
The structure sets the span, but drainage sets the layout. A wide opening means a long threshold, which needs a long channel to catch water. We include that in the drawings along with the beam and footings.
Check the weather exposure. A slider's track can be set a little above the patio, a folding door should have a drained track, and a pocket door should be kept out of any splash zone. Where the patio is covered, the choice is freer.
Water is kept out at the head by a metal flashing over the new frame, under the weather barrier. The beam sits behind it, sized by the engineer and supported by posts. Because the cap is hidden in the wall, the inspector looks at it before closing.
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