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

Keith L. of Silver Spring, Montgomery County, MD 20901

(Found on CheckBook.org) Crystal Exteriors did a gutter replacement on our home in addition to siding replacement (see separate review). All of our gutters/downspouts had special issues; for most of them, we had a option built in to divert water to rain barrels in the summertime and for regular drainage in the winter. Crystal exteriors did an outstanding custom job, the work crew were professional and prompt. I would highly recommend Crystal Exteriors for any such outdoor work.

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