ADU Construction in Monterey Park With a Butterfly Roof
Monterey Park ADUs under a butterfly roof that drains to one lined center valley and outlet, with overflow planned and footings matched to the grade.
A butterfly roof tilts its two planes inward, so every drop that lands on a Monterey Park backyard unit runs to a single valley down the middle. That valley carries the whole roof's water to one end, where a scupper drops it into a downspout. The tall outer walls leave room for high windows on both long sides. If the lot slopes, the outlet end faces downhill, and the pipe leaving it heads away from the footings.
The center valley
The valley is a wide channel lined with membrane or welded metal and built with its own fall toward the outlet, so water never sits in it. Its width comes from the full roof area it collects, because a single outlet takes everything. A second, higher overflow through the end wall gives water a way out if leaves clog the first. The deck beneath the valley gets extra underlayment, since a leak there would run straight into the ceiling below. A walkable strip along the valley gives safe footing for clearing the outlet screen.
From the outlet to the ground
The downspout under the scupper drops into solid pipe at a cleanout, sloped to a planting bed, a catch basin or the street gutter, depending on what the city permits and how the yard falls. A splash pad under the overflow keeps that occasional flow off the walls. Because one outlet carries the whole roof, its pipe is sized for the full load, and its route stays clear of footings and the property line. On a sloping lot, the discharge point sits well back from the top of any bank, and the drainage route appears on the plan set the city reviews.
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Turned so its roof outlet points toward open, downhill ground, inside the setbacks and over soil firm enough for shallow footings. Higher ground in the yard gives the roof outlet and the sewer line a downhill run. Lower ground may need piers and a longer drain line.
In Monterey Park, the package handles a single-story design whose floor stays at or under 500 square feet. Its structural sheet is where the valley framing and the built-in fall get detailed. Construction is priced after we have stood on the lot, with any slope engineering beside it.
Most of the extra goes into the roof: the lined valley, its overflow and the metal at the outlet. Carrying that water to the street by pipe means trenching to the curb. Where the yard drops, the low-side footings deepen or turn into piers, and each is priced by itself.
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