Below are a few pics of a recent project in an Aviara sub-division in Carlsbad. The first picture is the already developed home prior to the construction of a 657 square foot attached ADU on a corner lot which was ideal for this project. Over 25 tons of dirt was excavated and exported.
There's much to see here. The pad of the foundation is compacted to soil engineer specs, forms are built, and trenching for utilities is done after the soil engineer is satisfied and approves soil compaction. This project only required utility trenching for electric, water, and sewer.
The bottom of the foundation pad is covered with aggregate (or rock), followed by a heavy vapor barrier called "stago," and it is covered by sand. The rebar is then installed per the engineer specs, and the next step is to pour the foundation!
This is always an exciting day after months of work and preparation. The concrete trucks show up at 6:30 AM, and a large concrete crew is required to get the foundation poured correctly.