Adding Under on a Hillside, Images 21-29

Where the roots of old oak trees grew under the house, the crew stopped trenching and instead formed engineered grade beams to connect the discontinued footings in those locations.

Form for engineered grade beam

The tree roots continue to grow undisturbed beneath the grade beams.

For stem walls, the author uses 2x10s with form ties that also support rebar.

Where the patio and garage slabs were to be poured, the crew lined the inside form with a strip of rigid foam to create a ledge for the slab.

L-shaped rebar elbows inserted through the form horizontally will allow the eventual grid of rebar in the slab to be tied to the rebar in the perimeter stem wall.

With the new foundation in place, framing continues.

The proximity of mature trees testifies to the care the author took to blend the building sensitively with the site.

The retaining wall foundation adds needed living space where the building steps down the hillside.

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