Window Glossary

Window Glossary

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There are 2 names in this directory beginning with the letter R.
R-value
A measure of the resistance of a glazing material or fenestration assembly to heat flow. It is the inverse of the U-factor (R = 1/U) and is expressed in units of hr-sq ft-ºF/Btu. A high-R-value window has a greater resistance to heat flow and a higher insulating value than one with a low R-value.

Radiation
The transfer of heat in the form of electromagnetic waves from one separate surface to another. Energy from the sun reaches the earth by radiation and a person’s body can lose heat to a cold window or skylight surface in a similar way.

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Ellen M. of Potomac, Montgomery County, MD 20854

(Found on CheckBook.org)

We used Crystal Exteriors to replace our entry door with French Doors and a transom window above the door. The new doors and transom window look stunning and actually exceeded our expectations! Working with Edgar Li, the owner of the company, was a real pleasure. He is friendly, knowledgeable, and very responsive to all questions and concerns. He and his team delivered the highest quality work and service and we will happily work with them again.

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