New Construction in Redondo Beach: Balconies That Shed Water
How water is kept out of a balcony built over a bedroom in a new Redondo Beach house: slope, membrane, scuppers and flashing, plus the ADU options.
A balcony built over a bedroom is where a new Redondo Beach house is most likely to let water in. The deck surface needs a slope toward a drain or scupper, a waterproof membrane that turns up the wall behind the siding, and a door threshold set above the finished surface. Get those right and rain leaves the balcony without ever finding the room below it.
Layers under the deck
The framing beneath the balcony is sloped, commonly a quarter inch per foot, so water never relies on the finish to move. A membrane goes over the sheathing and laps up the wall and over the edge, with reinforced corners. Scuppers through the parapet or a drip edge carry water off, and an overflow path is planned in case a drain clogs. Near the ocean, metal flashing and fasteners are stainless or coated so salt does not eat through them. A flood test before the finish surface goes on proves the membrane.
Water at the ADU
The same rules apply if the unit has an upper deck or an exterior landing. A detached ADU sheds roof water to its own gutters and splash areas, while an attached unit shares the house's drainage path. A garage conversion needs its floor raised or sealed where it meets the yard, and a JADU relies on the house's envelope. Comparing the four shows which adds new water exposure. Every downspout then ties to a planned outlet so runoff leaves the lot the way the grading plan directs.
New Construction in Redondo Beach: common questions
Decks and landings make a strong case for planning together, wherever zoning allows a unit. Drawing both buildings at once lets the drainage plan route roof water from each to approved outlets. Adding a unit later can mean regrading a finished yard. The City of Redondo Beach confirms what the lot permits.
Before ground breaks, the lot is surveyed, the soils are tested and the utilities are checked, then drawings cover structure, energy, grading and drainage. The balcony waterproofing is detailed on the sheets. The city reviews the set, with a coastal step if the parcel calls for one, and footings are dug once the permit issues.
Structure and the water-resistive envelope fall under the California Residential Code. The energy and green codes add solar, insulation, water-saving fixtures and stormwater measures during construction. Fire sprinklers are required inside. City zoning sets height and yards, and a coastal permit applies only for a parcel within the Coastal Zone.
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