Foundation in 15 Photos
Details on prepping and pouring the slab.
The foundation design of the 2017 ProHOME project in Wilder, Vermont, was driven by several variables: thermal performance, controlling costs, and meeting the needs of target customers. You can read about how Paul and Tim Biebel balance these interests here.
This slideshow provides a glimpse of how Tim and his crew prepared the slab-on-grade foundation for the concrete subcontractor to pour the slab.
The ideal time to take care of radon mitigation is before the slab is poured. This is done by running 4-in. perforated pipe 1 ft. inside the perimeter of the foundation wall. This radon collection system is connected to a vertical pipe that will run up an interior wall. Once the slab is poured, the vertical perforated pipe is replaced with solid pipe and carried to the attic. If radon mitigation is necessary, an in-line fan is added and the pipe vented through the roof. (This image is from the first home built in the development, which is why the vertical vent appears in a different location in other photographs.)
The sill plate helps to keep the horizontal slab edge foam in place during the pour and anchors the vapor barrier. The vapor barrier is run long around the edges. Once the walls are framed and stood up, the vapor barrier is pulled up the outside face of the wall and taped to the Zip System sheathing to create a continuous air barrier.