ADU Construction in Walnut
Walnut ADUs finished in cement stucco over lath and a double weather barrier, chosen for hard sun and dry wind, permitted and built after a fire.
Cement stucco over metal lath is the wall finish we propose for a backyard unit in Walnut. It holds up under hard sun and dry wind, takes no harm from a sprinkler and does not burn, which matters on a lot that has already lost a house to fire. Behind it goes a double layer of weather barrier, so any water that works through a hairline crack runs down and out at the weep screed.
The wall behind the plaster
Stucco stays sound only when the wall behind it stays dry. We wrap the sheathing in two plies of building paper, lap it shingle fashion over the window flanges and set a weep screed at the base so water can escape. Control joints break large panels into smaller fields to limit cracking as the plaster cures. An integrally colored finish coat spares the wall from regular painting. Where a wall meets a roof, kick-out flashing turns runoff into the gutter and away from the plaster.
Drawings, review and the order of work
The wall section in the permit set shows the stucco, the paper, the sheathing and the insulation in order. Walnut reviews it with the rest of the ADU plans, and an inspector checks the lath and paper before the first coat goes on, since nothing behind the plaster can be seen afterward. Plaster needs curing time between coats, so the schedule leaves room for it before interior work that might jar the walls. When the main house is rebuilt too, both buildings share one stucco detail.
About our ADU Construction serviceEverything we build in Walnut
ADU Construction in Walnut: questions
Yes, if Walnut lets the ADU be permitted and finished first. The small house is framed, plastered and inspected ahead of the main one, which gives you a finished place on the property during the longer stretch of the rebuild.
For a Walnut lot, the unit has to be single-level and 500 square feet or smaller to fit the package. For a lot here we take care over the site plan and the wall section, as the reviewer checks placement on one and the stucco assembly on the other. City fees and the build are quoted once we have seen the lot.
Possibly. Old garage walls are often bare studs with siding nailed straight on, so we pull a section to see the framing and any moisture damage. We also test the slab and its edge footing, then weigh a conversion, with new insulation and plaster, against a new detached unit.
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Tell us about the property and what you have in mind. We reply with a written next step.