Room Additions in Culver City
Culver City room additions detailed to keep water off the new slab, sill and wall joint, with grading and drainage drawn into the plans.
A slab is poured over a sheet of plastic, and that thin sheet keeps ground moisture from wicking up into the new room. In a Culver City addition the vapor barrier is only the first layer of a water plan that also covers grade, gutters and the joint where new wall meets old. Each layer is drawn on the plans, so no one improvises it with the concrete truck waiting.
From the ground up
The soil beside the new footing is graded to fall away from the walls, and the finished floor sits above the surrounding dirt. Under the slab, gravel and a lapped vapor barrier stop moisture rising. Where a perforated drain pipe runs along the footing, it carries water to a spot the plans name. The sill is pressure-treated, and the base of the siding stays clear of soil and paving so water cannot wick into the wall. Lapped plastic over the crawlspace soil, where it is added, cuts moisture there as well.
Where the new roof meets the old
Water gets in at seams, and the seam between a new roof and an old wall is the longest one on an addition. Step flashing is woven into each course of shingles, and a kickout at the end sends runoff into the gutter, away from the siding. Gutters and downspouts for the new roofline are drawn with the plans and tied into the same drainage as the footing. The city building department reviews the drainage notes with the structure. Window and door openings in the new wall get flashing tape before the units are set.
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The engineer weighs the new floor against what the old footing can bear, using its width, depth and bars. Where it comes up short, extra sections or posts are drawn beneath the walls that need them. Dry soil holds a footing better too, so the grading plan sits in the same set of drawings.
New studs are bolted and strapped to the old ones, the floors meet at the same level through a ledger or beam, and roof sheathing carries over the joint. A water-resistive barrier and flashing close that joint before siding goes on. The wall opening is cut only after the new room is dried in.
An open crawlspace lets us anchor the sill, brace the low walls and repair damp spots on the old side while the footing crew is already there. It all fits a single permit, and the retrofit appears on the quote as a line of 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.