Room Additions in North Hollywood
North Hollywood room additions with footing drains, grading and roof drainage planned together so water leaves the new room and the old crawlspace.
Perforated pipe in a bed of gravel along the outside of a new footing carries water away before it can soften the soil beneath. In a North Hollywood addition that footing drain is paired with grading that falls away from the walls and downspouts that discharge clear of the foundation. On an inland valley lot, the odd hard storm tests each of them at once.
Following the water
Roof water leaves the gutters through downspouts, and each one needs a place to go. We draw them to splash blocks, lines to the street side or a drainage system the plans specify, with none aimed at the foundation. The footing drain slopes to a discharge point, and a filter fabric keeps soil out of the gravel. The sill sits well above finished grade, with a gap to the soil that stays clear of mulch and paving. Window wells and low doorsills get their own drain notes.
Crawlspace and slab details
The existing crawlspace gets attention too. Vents are checked for blockage, and the ground inside is covered with lapped plastic where it is bare. Under a new slab, gravel and a vapor barrier lie beneath the concrete. LADBS reviews a North Hollywood permit set, drainage notes included, and its inspector looks at the footing drain before it is buried, so the pipe and gravel stay open to view until then. The written quote lists each drainage item by name and location.
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The footing beneath the old walls is checked for size and bars, then set against a second floor's weight. Drainage belongs in that review, because dry soil bears load better. A footing that falls short gets pads or posts, cast ahead of the second floor.
A bolted ledger or a beam supports the new floor, and straps join the studs. Deck overlaps the seam. A kickout and flashing at the roof joint send water into the gutter, clear of the siding.
Since the crawlspace is exposed for the footing, anchoring the sill, bracing the low walls and correcting poor drainage all happen at once. The addition's permit covers it and a single inspection visit checks it. The quote keeps drainage repairs on a line of their own.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.