ADU Construction in San Gabriel
San Gabriel ADUs that begin with laser levels across the pad, so the footing depth, floor height and drainage are set by how the ground lies.
A laser level shot across the pad is our opening move on a San Gabriel lot. A few inches of fall over the footprint changes how the slab is formed and where water goes, and it tells us whether the floor has to step up from the yard. We also record how the house foundation sits relative to that spot, since a new footing near it has to respect the soil the old one bears on.
Reading the ground
A level pad lets the slab sit on a uniform bed of compacted base, and the perimeter footing goes down to the same depth all the way round. When the readings show fall across the footprint, the footing on the low side gets deeper, or the floor goes up on stem walls, so the frame sits level. The readings also set how we grade away from the unit, at least 6 inches in the first 10 feet, so roof and yard water run off and the soil under the footing stays even.
Review for a San Gabriel unit
Grading and footing details from that survey go into the structural and site sheets the San Gabriel building department reviews. The reviewer checks setbacks from the side and rear lines, footing sizes against the calculations, and the drainage arrows on the site plan. If the soil gives any doubt, a soils report is added. For an inland lot we call for a reflective roof covering and insulation sized for hard sun. After approval the first inspection is the footing trench, with forms, rebar and anchor bolts in place.
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ADU Construction in San Gabriel: questions
That comes from what the levels and the soil show. A pad that is level and firm takes a monolithic slab with a deepened edge, and a pad with fall or soft spots takes a raised floor on stem walls. The engineer then places the hold-downs and anchor bolts so the walls are fastened to concrete all round.
It can, when the edge footing reaches enough depth and the slab is sound and level. We check all three by measuring the edge, looking for cracks and shooting levels across the floor. A slab that tips toward the old car door may need leveling compound or a raised floor to meet the new threshold.
Any ADU kept to one story and 500 square feet. For a two-story or larger design, the price follows a lot review. In San Gabriel the site plan carries the grading and drainage and the structural sheets carry the footings, and those two get our most careful drafting.
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Describe the house and what it needs. We look at the structure first and send the quote in writing.