Walnut Room Additions That Stay Dry
Walnut room additions planned around water: flashed roof joints, graded soil at the new footing and downspouts that end well away from the wall.
Water gets into an addition in two places, at the joint where its roof meets the old one and at the low edge where the wall meets the ground. A Walnut room is planned around both before anyone picks a finish. Flashing handles the first, and grading, a gravel bed and downspouts that end well away from the wall handle the second.
The roof joint
Where a new roof lands on an old wall, bent metal flashing laps under the siding and over the shingles in layers, each one shedding onto the next. A valley that collects from both roofs gets a wider metal liner. At the low end of each slope, a kickout flashing throws water into the gutter and away from the wall. Gutters on the new eave tie into the old ones, which gives the water one continuous path to the downspouts.
The ground edge
Soil beside the new footing is shaped to fall away from the wall, with the stucco or siding stopped above the finished grade. Downspouts run into solid pipe that carries the water out to a drain or a planted area. A gravel bed with perforated pipe along the footing can be added if the lot holds water. Paving next to the room slopes away from it, and a patio that meets the wall gets a flashed joint at the door sill.
Room Additions in Walnut: what people ask
Folding or sliding panels can open much of the wall to the yard once an engineer has sized the beam. Under the threshold goes a sloped metal pan, so rain blown against the glass drains outside and never reaches the floor framing.
A second story leaves the yard and its drainage as they are, though the larger roof needs more gutter. A ground floor room adds a footprint that must be graded and drained. Either way the water plan is priced as part of the job.
This line covers opening the old wall, flashing the joint between the roofs and patching both sides. Gutter and downspout connections at the seam are on it too. A surprise behind the old wall changes that entry only.
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