Room Additions in Santa Monica
Santa Monica room additions that test the old footing for rusted steel first, with new footing sections, coastal-grade fasteners and flashed tie-ins.
Rust inside a concrete footing gives itself away only as hairline cracks and brown stains on the surface. Near the coast, where damp salty air reaches the foundation, that rust swells the steel and can split the concrete from within. On a Santa Monica addition that joins an old footing, finding it changes the plan: the engineer may call for a new footing section beside the old one so the addition rests on sound concrete.
Opening the old footing
Before the plans are final, we dig a test hole where the addition meets the house and look at the face of the old footing. A hammer tells sound concrete from hollow spots, and a crack gauge records any opening. If steel shows through, its condition goes into photos for the engineer. Sound concrete lets new steel dowels be drilled and epoxied into the old footing. Spalled or rusted concrete means the new footing stands on its own beside it, joined by a detail the engineer draws for that condition.
Permits and the coastal zone
Santa Monica's building and safety division reviews the structural drawings and inspects the footing before concrete is placed. Coastal zone status is a separate planning matter for each lot. If it does, a coastal development permit may be needed before construction, and city planning staff or the Coastal Commission confirm that for the address. Exterior details for the addition use hot-dip galvanized or stainless fasteners, and the siding, flashing and window frames are chosen for damp air, so the new wall holds up as well as the footing under it.
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Its size is only part of the answer, since what sits inside the old concrete matters too. The engineer weighs width, depth and steel against the new load, and our test hole shows whether that steel has rusted. A footing that measures well but is cracked from corrosion may still need new sections under the walls carrying the upper floor.
Where the old wall stays, a treated ledger or new studs are bolted to the existing frame at the spacing on the plans, and metal straps carry loads across the joint. The new roof sheathing laps over the old with flashing woven in. In damp air we use stainless or heavy galvanized fasteners for all of it.
Often, since the footing work already opens the ground and the crawlspace. New sill bolts and braced cripple walls fit on the same permit, and swapping rusted old bolts for new ones at the same time removes a weak point the addition would otherwise lean on.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.