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RIGID SHEET INSULATION: 
These materials are most often found in construction where the use of other more flexible insulations would not be possible. This may include "A-frame" type construction or other "open-beam" ceilings where the material is used on the outer layers of siding or roofing. Rigid sheet insulation is frequently used on walls behind brick or other sidings and is an excellent additional insulation used along with the regular insulation within the walls. It is also commonly used under slabs and footings to help prevent frost damage. The sheets are usually 2 to 4 x 8 feet, and come in a variety of thicknesses, each with a different R-value. The three most common materials used in rigid boards are extruded, molded, or expanded polystyrene, polyurethane and polyisocyanurate. 

The above information was provided by TWI Systems Copyright 1995-2005 1-800-553-5660

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This file was last updated on Saturday, 29-Dec-2007 18:28:44 EST * Copyright © 2008 All rights reserved by: Accurate Inspections, Inc. A New Jersey home inspection firm providing New Jersey Certified Home Inspections in NJ, by New Jersey Licensed home inspectors. Inspector of record Michael Del Greco, New Jersey Home Inspector License GI 0121.
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