When r1 the inner radius of a single layer of cylindrical insulation and r2 the outer radius equivalent thickness r2 1n r2 r1.
Roof insulation glossary.
Measure of resistance to heat flow.
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The ability of insulation to slow the transfer of heat is measured in r values.
The insulation glossary is located in the specs codes portion of nia s website which contains other valuable resources including the insulation materials specification guide that provides the physical and material properties of various insulation materials as specified by the astm.
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F kraft paper or foil backed paper are common facings.
Building insulation of course is what we are normally referring to when we say thermal insulating materials but in a commercial roof system the r values of other components such as underlayment cover boards and even some adhesives can often be included when calculating the total r value of the system.
Roofing terminology glossary of common terms the following terminology will help you understand our roofing services and what we offer.
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Insulation materials have tiny pockets of trapped air.
These pockets resist the transfer of heat through material.
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Equivalent thickness of insulation.
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