High-Performance Slab-on-Grade Foundation Insulation Retrofits
- NorthernSTAR, St. Paul, MN (United States)
A more accurate assessment of slab-on-grade foundation insulation energy savings than traditionally possible is now feasible. This has been enabled by advances in whole building energy simulation with 3-dimensional foundation modelling integration at each time step together with an experimental measurement of the site energy savings of SOG foundation insulation. Ten SOG insulation strategies were evaluated on a test building to identify an optimum retrofit insulation strategy in a zone 6 climate (Minneapolis, MN). The optimum insulation strategy in terms of energy savings and cost effectiveness consisted of two components: (a) R-20 XPS insulation above grade, and, (b) R-20 insulation at grade (comprising an outer layer of R-10 insulation and an interior layer of R-12 poured polyurethane insulation) tapering to R-10 XPS insulation at half the below-grade wall height (the lower half of the stem wall was uninsulated).
- Research Organization:
- NorthernSTAR, St. Paul, MN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B) (Building America)
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1221614
- Report Number(s):
- DOE/GO-102015-4726; 7193
- Country of Publication:
- United States
- Language:
- English
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