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High-R Foundation 11: 4" XPS Insulation on the Exterior of Foundation Wall | Building Science Corporation


Dow STYROFOAM HIGHLOAD 40 2' x 4' x 8' Square Edge XPS Insulation Price pending

Dow Building Solutions has been awarded BBA accreditation for its STYROFOAM ROOFMATE SL-A extruded polystyrene (XPS) insulation, designed for insulating inverted flat roofs.


Open-cell spray foam is an air barrier, but is vapor permeable. The figure above shows the XPS insulation detail required at the above grade portion of the foundation wall for cold climate construction to minimize moisture condensation at the cold concrete in the winter months, and minimize inward driven vapor in the summer months.