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.

TESTIMONIALS

Richard W. of Annandale, Fairfax County, VA 22003

(Found on CheckBook.org) Worked very closely with Mr. Li in selecting the proper door for our house. He was extremely professional and very detail oriented. He provided us with options, one of which was to remove the storm door and just have a wood style door. His recommendation was excellent. the new door on the house has so increased the curb appeal of our house. In addition, his staff was very accommodating in the installation of the door. I would highly recommend Mr. Li and his company for any subsequent work on our house.

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