Roof Insulations
	Insulation Specifications

Insulation Specifications

The JM Insulation Specification numbering system is designed to allow the designer to easily and clearly describe a particular insulation construction. Arabic numerals denote the number of layers of insulation attached in a particular manner. Capital letters indicate the method of attachment of the insulation and the presence of a vapor retarder.

Capital letters indicate the following:

Examples

A construction of one layer of insulation mechanically attached to a structural deck with a vapor retarder and a second layer of insulation mopped in hot asphalt would be described as 1MV1A.

Two layers of insulation mopped in hot asphalt to a structural deck would be described as 2A.

One layer of insulation loose laid on a structural deck would be described as 1L.