Room Additions in Northridge
Northridge room additions start by scanning the old footing for steel and checking bolts and bracing, so the scope reflects what is hidden.
What cannot be seen from the crawlspace is whether the old footing has reinforcing steel inside it. In a Northridge addition, a handheld scanner moved over the stem wall answers that, and the answer changes the plan. Footing with steel can accept dowels and take more load. Footing without it may need to be supported, thickened or left alone while new foundations carry the addition.
Scanning and sampling
The scanner reads for bars at the face of the stem wall, and a small test hole confirms what it finds. We note bar size and spacing where bars exist and mark the places where none show up, with photographs of each spot. The engineer receives the findings together with the sill and bolt notes. If steel is absent, the plans keep new loads off that footing or add reinforcement alongside it, and the quote names what that adds to the job.
What hidden conditions change
An unreinforced footing can still carry a ground-floor room, but a second story asks more of it. The engineer may specify a new footing set beside the old, tied to it with dowels where the steel allows. Bolts and bracing found missing are added as well. LADBS reviews a Northridge permit set, and its reviewers read the footing details closely. Inspections confirm the steel before concrete goes in. Nothing is poured until the reviewer has signed the drawing that shows it.
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That hinges on the scan. Footing with bars in good order can often take added load with strengthened walls above. Footing without bars gets support from a new footing beside or beneath it. The engineer decides after the site visit, and a callout on the plans shows the choice.
A ledger or beam frames the new floor into the old, and hold-downs and straps join the studs together. The roof deck overlaps and flashing seals the joint. Where the scan found weak spots, the connection moves away from them.
Often, since the crawlspace is open for the new work, bolting the sill and bracing short walls adds little. The retrofit travels with the addition permit and inspection, and the quote shows it as a distinct line.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.