R-value - a method of comparing the efficiency of various types of insulation, or the thermal efficiency of windows, doors, and roofing materials. The product is assigned a number based on its resistance to the transmission of heat and its manufactured thickness. The higher the number, the greater the insulating ability of the product. R-values of 15 to 30 are common for insulation in residential buildings.

© 2004 Bella Vista Publishing Company, Inc.  ISBN 0-9718225-0-6

.
	Copyright Protection:   This real estate web site is created in the United States of America and protected by copyright laws.  Permission should be obtained prior to any reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording or likewise.
.