A Glossary of Replacement Windows Terms for the Homeowner



	Vinyl Windows
	Wood
	Aluminum
	Wood Clad
	Fiberglass
	Casement
	Bay or Bow
	Awning Windows
	Double Hung
	Skylights
	Egress Basement
	Grades of Glass
	The Big Picture
	Defining Style
	Glossary of Window Terms

	Replacement Window Ratings
	Comparisons

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U-value refers to how much heat passes through the glass. The lower the U-value, the better the insulating quality.

UV block measures the percentage of ultraviolet rays blocked from being transmitted through the glass. The higher the number, the lower the percentage of rays transmitted through the window.

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