Tarzana Structural Work and the New Stair Opening

In a Tarzana second-story set, LADBS plan check traces how the new stair opening is framed and where its load goes, down to the footings that carry it.

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The hole for a new stair in a Tarzana house tells an LADBS plan checker a lot about a second-story set. Cutting through the ceiling joists leaves ends with nothing to rest on, so the drawings have to show the headers and trimmers around the opening, the hangers that hold them and the post or wall that takes their load down. A gap anywhere in that chain comes back as a correction.

Around the opening

Joists that once ran unbroken across the room now stop at the stair, and doubled members called headers pick them up. Those headers bear on trimmers, which carry the load to the sides of the opening. The plan checker wants each hanger named, each member sized and the nailing given. Where the stair lands next to a wall that will become bearing, the sheets show how that wall reaches a footing, which may be new and dug beside the old one.

The rest of the set

Beyond the stair, the reviewer follows the weight of the second floor down through the walls below and checks the shear walls that resist the sideways push of an earthquake. Hold-downs at the ends of those walls must match the foundation plan. LADBS handles this review for Tarzana addresses. Corrections come back as a list, the engineer answers each one, and the permit issues once the sheets agree. Plan check also asks how the new floor ties to the old roof line where the two meet. Until then, nothing in the house is opened.

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