Foamular makes three different higher strength foams for use under footings. I used Foamular 400. They also make 600 and 1000 for even higher loads.
The builder had to buy a pallet load of foam, which was more than needed. Insulation under the footing was important because the water table is right at the footings. The drain tile runs most of the summer. I did not want 40 degree water flowing right next to heated space.
I still want a Passive House, but the economics are not there. I'd be spending several tens of thousand dollars just for the bragging rights.
|