Room Additions in Calabasas
Calabasas room additions where the wall between old and new is opened under an engineered beam, with footings, tie-ins and ember-resistant exteriors.
"Does the wall the new room joins have to come down?" On a Calabasas visit, the honest answer depends on what that wall carries. If it holds up ceiling joists or roof framing, the opening between old and new needs a beam sized by the engineer, with posts that carry the load down to footings. If it carries little, a wide opening is simpler. The load path is drawn before anything is cut.
Sizing the beam over the new opening
The engineer looks at the span, the weight above and the posts at each end. A laminated or steel beam may be specified where the opening is wide, and each post needs a footing under it, which can mean cutting into the existing slab or adding a pad in the crawlspace. Temporary shoring carries the ceiling during the work, so the old studs can be removed safely. The beam goes in, the posts land on their footings, and the shoring is removed once the connections are complete.
Permits and exterior rules
Drawings for a Calabasas addition go through the city's building review. Because some parcels in the city are mapped for fire hazard, the exterior of the new room can fall under the ember provisions: screened vents, a boxed eave, siding that resists ignition and a fire-rated roof assembly. The parcel record is checked ahead of design, so the set names those products from the first submittal. The quote lists each exterior item separately, which shows what the rules add. The same review covers structure and exterior together.
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Room Additions in Calabasas: questions
That is decided by measuring. We dig a small hole next to the old footing, note its dimensions, and check for reinforcing steel. The engineer compares those measurements with the load an upper floor adds. Where the footing is adequate, framing goes up with new hold-downs. Where it is not, the plans add footing sections or posts first.
Where the opening between rooms is wide, a beam over it carries the old roof, and the new frame ties to the old one at every level from floor to rafters. Ledgers, straps and clips go where the structural sheets locate them, and the inspector sees each connection before sheathing and finish close the seam.
Often it is, since the crawlspace and walls are already open. Anchor bolts and bracing on the original structure can be folded into the permit application, and on a fire-mapped parcel the old vents can get ember-resistant screens. The written quote prices each item on its own.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.