Getting Started - Step 1 - Select State
To determine insulation and building air-tightness recommendations for your new solar home. First select the State closest to your building site.
R-Values
WALLS are all above grade exterior wall surfaces.
CEILING are the roof/ceiling assemblies exposed to the exterior.
PERIMETER are the floors that are slab on grade or crawl spaces.
BASEMENT WALLS are all exterior wall surfaces below grade.
NON-SOLAR WINDOWS are all non-south windows.
AIR CHANGES/HOUR refers to the tightness of the building shell and its resistance to the penetration of wind.
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