Fire repair and hardening in Newbury Park, Ventura County

Bay and Overhang Undersides in Newbury Park

On a Newbury Park house we enclose the underside of bays, cantilevered floors and boxed overhangs in noncombustible soffit, with listed ember resistant vents.

Describe the house and the work

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On a Newbury Park house, the undersides of things that project from the wall come first for us: a bay window, a floor that hangs past the foundation, a box over the garage. In a suburban inland setting, sun and dry wind work on those soffits until the joints open, and an open joint gives embers a pocket to settle in. Pieces of Newbury Park fall inside mapped fire hazard areas, and a parcel inside those lines may need ember resistance on these very surfaces.

Looking up from the ladder

From a ladder we check what closes each projection from below. Plywood with gaps at the seams, boards that have shrunk apart, a vent cut straight through the panel, or a crack where the soffit meets the wall each let embers in. We test the framing ends with a pick to find rot from water that crept in above, and note any bare insulation. A bay window also has a small roof of its own, and the flashing where that roof meets the main wall leaks often enough that we check it on every visit.

Enclosing the projection

Exposed wood under the projection comes off and is replaced with fiber cement panel or cement plaster on metal lath, both noncombustible, and every edge is sealed tight to the wall. If the space needs air, it gets a vent listed for ember resistance. Mineral wool goes into the cavity behind, since it will not burn. Where a lot falls inside a mapped zone, the state wildfire rules set requirements for the underside of floor projections, and the building department checks the finished soffit against the material named on the drawings.

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