At wide spots in the trench, the foam is poured to a consistent thickness against a sheet of OSB.
NorthernSTAR Building America Partnership At wide spots in the trench, the foam is poured to a consistent thickness against a sheet of OSB.

Researchers on the NorthernSTAR team of the U.S. Department of Energy's Building America program have been working on a problem that will intrigue anyone finishing out a basement or wanting to make a real dent in the energy performance of an existing home in a cold climate: Is there a minimally invasive, cost-competitive, easily deployable method of upgrading soil-side foundation insulation in existing buildings? There's a lot packed into that question.

Minimally invasive. Adding insulation to the outside of a building foundation is usually difficult to impossible to do on an existing home. In cold climates, we are typically dealing with frost walls or a full basement, so the job will require a wide trench around the building perimeter to allow workers to damp-proof and secure rigid foam...

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