Simi Valley ADU Construction With Ember-Resistant Vents
A Simi Valley ADU vented through listed vents with a heat-activated core, sized for attic airflow on a fire-mapped lot, or built with a sealed attic.
Listed vents with a heat-activated core are the openings we specify for the attic of a Simi Valley backyard unit. Behind the metal face, a coated honeycomb swells shut when fire heat reaches it, closing a path that embers and flame could follow into the roof. Where a parcel sits in one of the mapped fire hazard zones that cover parts of Simi Valley, the ember rules expect vents of this kind.
Enough air through a smaller opening
A listed vent passes less air than an open screen of the same size, so the attic still needs the net free area the code asks for, counted from each product's listing. That can mean more vents, or longer strips along the eaves, with the rest near the ridge so warm air can rise out. Each one sits in its own framed opening, flashed into the siding or plaster around it. A vent schedule on the plans gives the product, its listing and how many are used, and the reviewer checks it against the size of the attic.
A sealed attic, and the older house's vents
A second path leaves the attic with no vents at all. Foam insulation applied to the underside of the roof deck brings the attic inside the conditioned space, which the energy code allows with the right details, and leaves no opening for an ember to find. Roof shape and the heat pump's ductwork help decide between the two. The main house's own vents stay as built, since the unit's permit does not reach them, though fine metal mesh behind an old gable louver is a modest step worth weighing.
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ADU Construction in Simi Valley: common questions
The feeder leaves the house's panel through buried conduit and ends at a subpanel in the unit. Because the unit is a separate building, the electrical code wants a way to shut its power off right there, and the subpanel's main breaker can serve, labeled so a firefighter finds it fast. Any gas line branches from the house's piping after its meter.
Yes, and its slab needs cleaning before anything covers it. Oil and fluids soaked into an old garage floor keep adhesives and sealers from bonding, so the surface is ground or shot-blasted down to clean concrete, cracks are filled and low spots leveled. A vapor barrier then goes down under any floor built up over it.
Hold a sample against the main house's window trim. Wood sash on an older house is often painted in a trim color, while fire-rated windows for the unit tend to arrive with factory frames. Comparing the maker's color chips with that paint in daylight, or ordering a frame that takes paint, lets both buildings show the same line around their glass.
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