Materials:ENRGY 3 CGF Insulation

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Materials:ENRGY 3 CGF Insulation

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Notice to the Reader:

The roofing assembly / material information published in the RCABC Roofing Practices Manual and offered below does NOT represent a complete set of the manufacturer’s data or specifications. The preparation of a detailed specification is the responsibility of the design authority.

Manufacturer: Johns Manville Corporation
Accepted for RoofStar Guarantee Program
Date TBA
Product Summary
Johns Manville Corporation manufactures a variety of polyisocyanurate insulations. The insulation panels are manufactured with flexible facers, trilaminate foil, glassmat, or non-asphaltic inorganic matt facers for use in virtually all roof assemblies.
These insulations are lightweight, easy to handle, and fully compatible with recognized roofing systems, deck types and materials. Their closed-cell structure assures long lasting thermal performance. The same polyisocyanurate foam core formulation is used in all the products manufactured by Johns Manville Corporation.
ENRGY 3 CGF identifies the most widely used insulation using HCFC 141.b in the family of products manufactured by Johns Manville Corporation.
Long Term Thermal Resistance (LTTR): RSI value = 1.06 / 25 mm (1") [R Value = 6.0 / 25 mm (1")]
Compressive Strength 138 kpa nom (173 kpa available) [20 lb / sq. in nom (25 lb / sq. in available)]
Uses All conventional single-ply, modified and built-up roofing systems.
Standards Conforms to CAN / ULC-S704-01 / CAN / CGSB 51.26-M86 (Types 1-4)
FM-Class 1, I-60, I-90
ULC S-126
Standard Sizes 1.2 m x 1.2 m
(4' x 4')
1.2 m x 2.4 m
(4' x 8')
Thicknesses: 25 mm to 104 mm (1" to 4.1")


Johns Manville Corporation designs and manufactures tapered polyisocyanurate roof insulation systems, with slopes ranging from 1:200 (1/16" in 12") to 1:25 (1/2" in 12"). The most commonly used slopes are 1:100 (1/8" in 12") and 1:50 (1/4" in 12"). Complimentary computerized design service, as well as the normal “shop drawings” required for application, are available to the architect / specifier from Johns Manville Corporation.

Click below for the Technical Data Sheet.
Technical Data Sheet

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