Glendora ADU Construction and a Bathroom That Dries Out
Glendora ADU construction with a bathroom planned to shed its steam: a ducted fan on a humidity control, sealed walls and an ember-ready vent cap.
Steam from the bathroom of a Glendora backyard unit has nowhere to hide in a small building, so the room is planned to push it outdoors. A quiet fan on a humidity control runs a short, smooth metal duct to a wall cap with a damper. The shower walls get a waterproof membrane behind the tile, and the door is undercut so fresh air can enter while the fan runs.
Fan, duct and the air that replaces it
A fan only works as well as its duct. A run that is short, straight and rigid moves close to the fan's rated airflow, while a long, crushed flexible duct can cut it to a fraction. The duct slopes slightly toward the outside so condensation drains out, and it is insulated where it crosses a cold attic. Air leaving has to be replaced, so the door gets a gap at the bottom or a grille. An openable window with obscure glass helps on a mild day, though the fan stays the main tool, since it runs whether or not anyone remembers to open the window.
Walls that stay dry, and the vent on a mapped lot
Behind the tile, cement board carries a liquid or sheet membrane that runs past the shower opening, and the rest of the room gets moisture-resistant board and a paint that tolerates humidity. If the address lies inside a mapped fire hazard severity zone, as parts of Glendora do, the fan's wall cap is chosen to resist embers along with the other openings in the unit, and the roof, siding and windows follow the same rules. Its small window repeats the shape of the bathroom window in the older house, so from the yard the two buildings share a line.
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Power, water and the drain each come from the main house, so each is tested before the unit is drawn: a load calculation for the panel, a pressure reading for the water line and a camera run for the lateral. With heat pumps for heating and hot water, no gas line needs to cross the yard.
Often, though a garage never had to manage steam. The new bathroom gets the same fan, duct and membrane as a new building, and the slab under the shower is cut for the drain. The footings and the roof framing are checked first, and on a mapped fire hazard lot, new siding and vents follow the ember rules as well.
The main house lends the unit its roof pitch, eave depth and wall finish, and the windows keep its proportions. If ember rules apply, some products change, such as fiber cement boards cut to the width of the house's wood ones, so the likeness rests on shape, board width and color.
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