Room Additions in Lake Balboa
Lake Balboa room additions framed on engineered I-joists that stay straight in hard inland sun, so the new floor meets the old one at a flush line.
Engineered I-joists carry the floor of a Lake Balboa addition when the room sits over a crawlspace. Sawn lumber keeps drying after it is installed, and under hard inland sun and dry wind a joist can shrink or twist, opening gaps at the joint with the old floor. Manufactured joists start dry and stay straight, so the new floor meets the old one at a flush line that holds.
Why the floor framing matters at the seam
The seam between old and new floors is where movement shows first. If new joists shrink in height, the floor drops slightly and a ridge forms at the doorway. I-joists and a laminated strand rim board hold their depth, so the finished floors stay level. They also span farther, which can reduce the number of posts and footings under the room. The engineer sizes them to the span and load, and the manufacturer's hanger and blocking details are followed exactly.
Protecting the material on site
Engineered joists arrive wrapped and are stored flat and off the ground until they are installed. Holes in the web follow the manufacturer's chart, and the flanges are never notched or drilled. On an inland lot, framing left uncovered under hard sun can check and warp, so the floor is sheathed and the walls are raised soon after delivery, and the roof goes on before interior work begins. LADBS inspects the floor framing before anything covers it, so the hangers and blocking are still in view.
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Room Additions in Lake Balboa: questions
That needs the engineer's numbers. We measure the existing footing in a small test pit and note any steel in it, then the engineer checks those figures against what a second level would weigh. Long-span engineered joists can reduce point loads, but undersized old concrete still gets added footing sections first.
The new I-joists hang from metal hangers on a ledger bolted to the existing rim, with the hanger model matched to the joist size. Wall top plates are lapped and strapped across the joint, rafters are clipped to the original top plate, and the roof seam gets its flashing ahead of the roofing.
It makes sense when the old house has loose or missing sill bolts, or short crawlspace walls with no bracing. With the crawlspace opened for the new room, that retrofit can go into the LADBS permit scope and be priced in our written quote on a separate line, leaving the decision to you.
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Book an inspection in Lake Balboa
Describe the house and what it needs. We look at the structure first and send the quote in writing.