ADU Construction in Mission Hills, Roof to Footing
ADUs in Mission Hills with the roof, gutters and drain lines planned alongside the footing, so water never pools against the new foundation.
We draw the gutters of a Mission Hills ADU before its footing, since the two have to agree on where water goes. We pitch the roof toward the edge farthest from the main house, size each downspout to the area it drains, and carry the flow in solid pipe to ground that can take it. A soaked strip of soil beside a slab is where settlement and cracking begin, and clay, if present, swells when wet.
Roof shape and the load it carries
A shed roof sends water one way and puts its weight on two bearing walls of different heights. A gable splits both the water and the load evenly between two eaves. Either way, the rafters or trusses need metal straps at each wall top so an earthquake cannot lift them off the plate. LADBS checks those connections at the framing inspection. For long exposure to hard sun, we specify a reflective covering rated for heat and lay full underlayment before the first panel goes on. Flashing at every wall junction keeps water out of the framing.
Where the downspouts go
Closed pipe carries each downspout's flow at a steady fall to a drywell, a planting area or the curb outlet the city allows. Discharge points stay well clear of the new foundation and of the main house footing. Hardscape around the unit tilts away from the walls, so splash and irrigation drain off. On a yard that tilts toward the unit, a shallow swale can catch runoff upslope before it reaches the back wall. Grading and drainage notes on the site plan show the reviewer each of those paths, and the inspector walks them before final.
About our adu construction serviceEverything we do in Mission Hills
ADU Construction in Mission Hills: questions
For a detached unit on level ground, the standard base is a reinforced slab ringed by a deeper perimeter footing. Where the design calls for a raised floor, a stem wall and interior piers carry it. Anchor bolts and hold-downs connect either one to the walls above, at the spacing the engineer sets in the calculations.
Only if the footing under the garage walls is already the size the engineer needs. We chip at the slab edge to measure it and check for rebar. When it passes, the walls get anchor bolts and new shear panels. When it does not, we add new footing sections, and the plans show each one by location.
In Mission Hills the package applies to a single-story ADU no larger than 500 square feet, either detached or converted. Anything bigger, or a second story, is priced after a lot review, and LADBS plan check fees sit outside the package price.
ADU Construction in other cities
More we build in Mission Hills
Book an inspection in Mission Hills
Describe the house and what it needs. We look at the structure first and send the quote in writing.