Northridge Room Additions Built to Keep Water Out
Northridge home additions with a sill pan under every glass door, flashed openings and a roof that sheds water away from the new wall. By Palmcrest.
A pan of flashing metal sits under every glass door we set in a Northridge addition. It catches whatever slips past the frame during a hard storm and sends it outward, away from the new floor. Doors that open to the yard are the thinnest part of a wall, so the water plan for the room starts at the threshold and works upward to the roof.
Under the threshold
The sill pan is sealed at its corners and lapped over the waterproof membrane below, with a slight tilt to the outside. The door frame is set in sealant and shimmed level. Flashing tape goes on in shingle fashion: sill first, jambs next, head last, so each layer sheds onto the one beneath. The finished threshold sits above the patio surface by a safe margin, and the patio slopes away from it. A drain or a gap in the paving takes over where runoff would otherwise gather.
Roof edge and wall
Above the door a deeper eave or patio cover keeps rain off the glass, and a gutter carries roof water to a downpipe that ends well clear of the foundation. Fresh roofing that climbs the old wall gets metal flashing is woven under the siding or stucco, with caulk only as a backup. Windows in the new walls get the same pan and tape sequence. A hose bib or irrigation line near the wall is checked, since a leaking fitting can soak the foundation unnoticed.
Room Additions in Northridge: what people ask
A wide glass wall can stay dry. The beam spans the gap, the doors sit on a sealed sill pan and the patio slopes away from the threshold. With a deep eave or patio roof above, it holds up in a downpour.
Either route is flashed at every wall base and joint. Ground level rooms need yard depth. A second story keeps the lawn, though the old foundation and walls get an engineer's review and the new roof has to be woven into the old one with metal flashing.
Flashing where roofs meet, the cut through the old wall, blending the exterior and linking footings all fall under one quoted heading for the join. Extra valleys, or framing damaged by earlier leaks, add to it.
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