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R-Panel Roof Insulation
Johns Manville

R-Panel Roof Insulation

Johns Manville ENRGY 3 is a closed-cell polyisocyanurate foam-core roof insulation board faced on both sides with a coated organic felt facer, offering a high R-value to keep buildings well insulated from the elements. ENRGY 3 delivers high R-value per inch in built-up, modified bitumen, metal roof, and single-ply roof systems and is approved for direct application to steel decks.

The product meets ASTM C1289 Type II, Class 1, Grade 2 (20 psi) and is available in flat or tapered boards in thicknesses from 0.5" to 4.1" and board sizes of 4×4 ft and 4×8 ft. A 25 psi (Grade 3) variant is also available. ENRGY 3 is the workhorse roof polyiso in JM's commercial-roofing lineup.

Specification

  • R-value: ~R-5.7 per inch LTTR. Listing: ASTM C1289 Type II Class 1 Grade 2 (20 psi); Grade 3 (25 psi) variant available.

    Thicknesses: 0.5"–4.1", flat and tapered. Sheet sizes: 4×4 ft and 4×8 ft. Approved for direct-to-steel-deck application.

Technical specification
  • Unique ref.r-panel-roof-insulation
  • Product familyInsulation
  • Product groupPolyiso Roof Board
  • TypeObject (single object)
  • Date of publishing2026-07-15
  • Edition number1
Links
Related
  • Designed inUnited States
  • Manufactured inUnited States
Classification
  • BIMobject CategoryBuilding Materials - Insulation

Region availability

North America
Anguilla
Antigua and Barbuda
Aruba
Barbados
Belize
Bermuda
British Virgin Islands
Canada
Caribbean Netherlands
Cayman Islands
Collectivity of Saint Martin
Costa Rica
Cuba
Curaçao
Dominica
Dominican Republic
El Salvador
Greenland
Grenada
Guadeloupe
Guatemala
Haiti
Honduras
Jamaica
Martinique
Mexico
Montserrat
Nicaragua
Panama
Puerto Rico
Saint Kitts and Nevis
Saint Lucia
Saint Pierre and Miquelon
Saint Vincent and the Grenadines
Saint-Barthélemy
Sint Maarten
The Bahamas
Trinidad and Tobago
Turks and Caicos Islands
U.S. Virgin Islands
United States

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