Temple City ADU Construction With a Dry Patio Door

Temple City ADU construction with the roof tilted so rain falls behind the unit, keeping the patio and its glass door dry and shaded.

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Glass on the tall side and water on the short side sums up the roof of a Temple City ADU. Its high edge sits over the patio door, and a deep overhang there throws shade across the glass and gives a sheltered spot to step out on a wet evening. Its low edge runs along the back wall, where a single gutter collects every drop and a downspout empties into a gravel bed or a planter.

A roof that keeps the patio dry

Tipping the roof up toward the patio lets the tallest wall hold the widest glass, so the main room gets the most light where it opens to the yard. All of the water heads the other way, to one gutter sized for the whole roof. A drip edge and a kickout flashing at each roof-to-wall joint stop water from tracking back into the framing. The overhang on the high side is framed with exposed rafter tails or a closed soffit, and either one carries a light fixture for evening use.

Where the water goes after the gutter

The downspout outlet can feed a planter with a gravel base, a rain barrel or a drain line to the street, depending on what the lot and the city allow. Water is kept away from the footings of both buildings and away from the neighbor's fence line. Drainage is one of the items checked in the Temple City review, along with the unit's size and setbacks, so the roof plan and the drainage are drawn together and handed in as a pair.

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