Almost like making a cake. Layer after layer. Step after step.
The white is the R-10 insulating foam. First we compact the soil to concrete stiffness, then we put squishy foam on top. Go figure.
The groove in the foam is for a thickened slab under the home theatre wall. The home theatre will be concrete all four walls. Quiet so it can be loud.
I am doing the hydronic work myself. Today I got 400 lineal feet done. ‘Course I got 800 feet still to do. And that is just on the basement level. Hard to think about floor heat when it is 100+ outside.
Next big step will be the slab.