Altadena Decks & Patios for County Review
Altadena decks and patios drawn for Los Angeles County review: footings set back from any slope face, a traced load path, and listed ember-resistant boards.
Altadena has no city building office of its own, so a deck there is reviewed by Los Angeles County, and the county plan checker starts with where the footings meet the ground. A footing placed near the top of a downhill grade needs enough soil in front of it to resist pushing outward, and the drawings must show that distance. Where the lot is flat, that check is brief, and review moves on to framing and fire details.
Footings, soils and the slope setback
On a parcel with grade, the county can ask for a soils report before it approves footing depths, and the engineer's design then cites that report by name. The plan shows each footing in section, with its depth below the lowest adjacent soil and its clearance from the slope face. Drilled piers often take the place of spread footings where that clearance is hard to get. The reviewer also follows the load upward through post bases, beam connections, joist hangers and the ledger bolts into the house rim, each identified by its manufacturer model. Bracing for tall posts gets a detail of its own, drawn the way it will be built.
Ember rules on a mapped parcel
For the share of Altadena that lies in mapped fire hazard zones, the county expects the top surface of a deck to be a product listed for ember resistance. The listing is attached to the set, so the inspector can match the delivered boards against it. The underside matters as much as the top. An open frame collects dry leaves, so the plans show either an enclosed underside or skirting with fine metal mesh at the vents. Metal flashing closes the joint where the deck meets the house wall. Any product swap during the build goes back to the county for approval before installation.
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Soil testing answers it for an Altadena yard with any fall. The engineer looks below fill and loose topsoil for material that can carry the post load, then sizes each footing and keeps it back from any slope face. Drilled piers suit the steeper ground. A county inspector checks the open holes before concrete.
We check the address against the fire hazard map before design. A mapped Altadena lot calls for listed ember-resistant boards, an underside closed with skirting or fine mesh, and metal flashing at the joint with the house. A lot outside the mapped zones is held to the general building code, and a rated surface can still be chosen.
Footprint and height are listed apart. A larger footprint adds decking, framing and guard in proportion. Extra height is less even: longer posts need bracing, footings go deeper, overhead work needs scaffolding, and on a mapped lot the skirting grows with it. Seeing the two separately shows which change saves more.
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