Room Additions in Winnetka
Winnetka room additions drawn so LADBS can follow seismic force from the new roof and floor into braced walls, with inspections run footing first.
Collector straps and roof sheathing nailing get a careful read when LADBS reviews a Winnetka addition. During an earthquake, the roof and floor act like flat plates that gather sideways force and hand it to the braced walls. If the new plate is not connected to the old one along the joint, the two halves can pull apart. The plans have to show that connection piece by piece.
Following the force across the joint
The reviewer checks that blocking runs along the seam where new and old roof framing meet, that sheathing is nailed to it at the spacing the engineer set, and that metal straps carry force from the new roof into an existing braced wall. At floor level, the same idea applies to the ledger and the rim. Every one of those parts needs a callout with a size and a fastener schedule, and missing ones come back as corrections. The calculations sheet has to agree with every one of them.
Inspections in the order they happen
On site, the footing trench and its steel are inspected first, before concrete is placed. Framing comes next, and shear panels, straps and hold-downs are checked while still exposed. Rough plumbing, wiring and ducts pass their own inspections, and the frame inspection is made once those are approved. An insulation inspection comes next, and drywall waits for it, since covered walls cannot be checked. The engineer's details guide each step, and our written quote prices any upgrade to the existing structure as a separate line.
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The engineer checks that against measurements. We open a small test pit at the existing footing to measure it and check for reinforcing. If the footing can carry an upper floor, the work proceeds with new braced walls and hold-downs. If not, LADBS sees new footing sections in the plans before approval.
At the roof, blocking and nailing join the sheathing across the seam, and straps carry force into an existing braced wall. A bolted ledger supports the new floor along the old rim. Each item carries a callout on the plans, and the frame stays exposed until the inspector approves it.
If the engineer finds missing anchor bolts or unbraced short walls under the old floor, the open crawlspace makes this a sensible time. The retrofit is added to the LADBS permit scope, designed by the engineer, and priced in our quote as its own line, apart from the addition.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.