Introduction - Page 3

1.1.6 JM recognizes the need for roofing specifications and requirements for application of these specifications to be adjusted for various climatic conditions. Therefore, we have divided the United States into three geographical regions which are shown below.

1.1.7 If there are regional limitations for the use of any roofing specification, they are indicated on the individual specification or in the Roof Finder Index. It is essential that only products capable of meeting the environmental conditions applicable to the actual service area be utilized in the roofing system. Use of any of these regionally limited materials in specific locations should be pre-approved by a JM Technical Service Specialist.

1.1.8 All information and specifications contained in this manual supersede all prior data published by JM on this subject. We reserve the right to change or modify, at our discretion, without prior notice, any of the information, recommendations, or specifications contained in this manual.

1.1.9 The physical properties and characteristics of JM commercial/industrial roofing products, roof insulation, and roof accessories as published in this manual represent typical, average values obtained in accordance with accepted test methods conducted under controlled laboratory test conditions. They are subject to normal manufacturing variations and could change without notice. Check with a JM Technical Service Specialist to assure current information.

1.1.11 Headings are included for reference only and are not restrictive as to content.

1.2 The Roof as a "System"

1.2.1 When developing a roofing specification, the designer and specifier must consider the interaction of the various components of the roof with each other, and with the substrate, as well as the chemical and physical compatibility of the components with each other. The best way to achieve this is to view the roof as a "system", not just an assemblage of parts and pieces.

1.2.2 Considering the roof as a system also draws the specifier to the concept of single-source supply. When a single-source is specified for all of the roofing materials, concerns about system compatibility are minimized, since the manufacturer will have addressed these concerns in their system design.

1.2.3 The design and specification of a roofing system does not have to be tedious and cumbersome. On the following page is a diagram that outlines the steps involved in writing a system specification. Also, in Section 13 are Guide Specifications for Built-up and Modified Bitumen Roofing Systems.