Structural Work for Older Sylmar Homes
Will drilling into the foundation of an older Sylmar home crack the plaster? A retrofit works from the crawlspace, so the walls and trim upstairs stay put.
Will drilling into the foundation crack the plaster upstairs? For a crawlspace retrofit under an older Sylmar home, the risk to plaster is small, because the drilling happens below the floor. Anchors are set into the footing from underneath and plywood is fastened to the short walls that hold the house up. Rooms stay furnished, original walls and trim are never opened, and the noise is what you notice most.
A day under the floor
Work starts at the crawlspace hatch with a hammer drill, a nail gun and plywood cut to fit each bay. Anchor holes go down through the sill into the footing, and each bolt is set in epoxy or as a wedge anchor depending on how the concrete drills. Panels are nailed to every cripple wall on the schedule the plan calls for, with holes cut so the cavity can breathe. Vibration upstairs is mild, though a framed picture may need straightening once the drilling stops.
When the job reaches the roof edge
Part of Sylmar falls within mapped fire hazard zones. If a lot sits in one and the structural work opens the eaves or a gable end, ember resistant vents and enclosed soffits may join the scope. Bolting and bracing under the floor never get that high, but a beam that carries into the attic can. LADBS reviews plans for both, and before the hatch is shut its inspector counts anchors, checks panel nailing and reads the stamps on each connector. Patching upstairs waits for that signature.
Structural Work in Sylmar: common questions
One sign alone proves little. A door that drifts open, a floor with a lean and cracks rising from window corners, seen together, are worth a call. Under the house, a sill with no anchor nuts, bare cripple walls and posts propped on blocks settle the question.
LADBS issues the permit, because Sylmar lies inside the City of Los Angeles. A basic retrofit can usually follow the standard plan the city publishes. Moving a wall that carries load or adding a footing calls for an engineer's calculations and drawings before plan check.
For bolting and bracing, yes, since that work never reaches the finished rooms. A beam is different. Casings and baseboard near the opening are pried loose by hand and stored, and the new plaster is troweled to blend with the wall around it.
Structural Work in other cities
Other work we do in Sylmar
Talk to us about your house in Sylmar
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