Measures the resistance of a product to heat flow. A high-R-value window has a greater resistance to heat flow and a higher insulating value than one with a low R-value.
Adding or replacing items on existing buildings. Typical retrofit products are replacement windows and doors, insulation, storm windows, caulking, weather-stripping, vents, landscaping.
The opening in a wall into which a door or window is to be installed.
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