Room Additions in Sherman Oaks, Plaster Kept Intact
Room additions in Sherman Oaks planned to protect plaster, trim and the rooms beside the new wall while the opening is cut and framed.
A fair question before anyone calls about a Sherman Oaks addition is what happens to the room next to the new wall. Plaster over wood lath cracks when a saw cut or a hammer sends vibration through it, so the opening is planned to protect it. Cuts are scored first, the old wall is braced, and the new framing goes in before the plaster is touched.
Protecting plaster and trim
Plaster on lath is brittle but stable until something shakes it. A score cut with a blade along the line of the new opening keeps cracks from running past it. Shoring goes in before the first stud comes out, a temporary wall holds the ceiling, and dust barriers cover the rooms that stay. Trim near the cut is labeled and removed whole so it can return to the same openings. Any patch is done in plaster or a skim coat that takes paint the same way, so it blends with its neighbors.
Choices that shape the opening
A new opening in an old wall can be a wide cased passage, a pair of doors or a short pass-through, and each loads the wall differently. Where the wall carries load, a wide opening calls for an engineered beam and posts that reach a footing. The Los Angeles Department of Building and Safety reads that framing as part of the addition set. A narrower opening may need only a header. Painter's tape on the floor lets the width be judged in the room before it is drawn.
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Window pattern carries the match: lites, sill slope and casing width are copied from the existing openings, and roof pitch is taken with a level. Wood siding pulled from the joint can be reused on the new wall, and new boards are primed on every face so they hold paint.
Sometimes, once an engineer has checked. Plan reviewers at LADBS want a clear path for new load down through the walls to the footings. Walls lacking that path get steel straps, shear panels or posts, and thin footings get widened. All of it is listed in the scope.
Plaster walls beside the connection are shored while the frames are joined. An engineer specifies the hardware, new rafters overlap old ones past the seam, and floor levels are matched before the inspector signs off. Plaster patches follow once framing is approved.
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