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Insulated Roof Panel Systems

Insulated roof panels provide a high level of thermal R-value to your building, leading to energy savings for your facility. NBS offers two IMP roof systems: the SR2 Standing Seam and HR3 High Rib panel. Nucor’s SR2 brings the look of a traditional standing seam roof with all the benefits of an insulated metal panel. Our HR3 is the economical solution to field assembled metal roofing and installs quickly by through fastening at the standing ribs into supporting structural members.

Metal building featuring insulated panels


Testing and Approvals

NBS insulated roof panels have been extensively tested under a variety of North American Standards to ensure compliance with various building codes and industry standards.

ASTM C518: Thermal Transmission
ASTM D1929: Ignition Properties
ASTM E72: Structural Strength
ASTM E84: Flame Spread/Smoke Index
ASTM E108: Fire Testing
ASTM E1646: Water Infiltration
ASTM E1680: Air infiltration
FM 4471: Class A Fire Rating
FM 4471: Class 1-SH Severe Hail Damage
FM 4471: Wind Uplift Approvals
FM 1-60: Fire Testing
FM 1-90, FM 1-105, FM 1-135: (SR2 only)
FM 4880: Class 1 Fire Rating
FM 4881: Class 1 Ext Wall System
Florida (FL) Approved

CAN/ULC Testing
     S138 Fire Endurance
     S102, S126 Flame Spread
     S127 Flammability
     S134 Fire Test of Exterior

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Standing Seam (SR2)
Insulated Standing Seam Panel
High Rib (HR3)
High Rib Insulated Roof Panel
Click on image for detailed information

IMP Roof Features

  • The HR3 and SR2 panels have an overlapping joint that is self-aligning, with factory caulked seams.
  • High level of thermal R-Value leads to energy cost savings for your facility.
  • Panels arrive on-site in one piece, requiring a simple one-step installation, reducing construction time and costs.
  • Standard metal surface is 26 gauge G-90 galvanized steel, with a PVDF coating providing fade-resistant, energy efficient exterior.
  • HR3 Roof Panels are available in 2.5", 4", 5", and 6" thickness and install quickly and easily by through fastening at the standing ribs into supporting structural members.
  • Fast, single component installation eliminates the inefficiencies of multi-piece, field assembled roof systems, saving installation time as well as labor costs.
  • The SR2 trapezoidal rib design provides added strength against potential foot traffic damage compared to other standing seam products.
Structural Load Table
Allowable load for all wal
Thick-ness PSF HR3 Panel Spans SR2 Panel Spans
4' 4.5' 5' 5.5' 6' 7' 4' 4.5' 5' 5.5' 6' 7'
2.5" 2.33 83 73 65 59 54 45 n/a n/a n/a n/a n/a n/a
3.25" 2.48 n/a n/a n/a n/a n/a n/a 90 79 70 62 56 46
4" 2.65 116 102 90 81 73 61 112 98 87 78 71 59
5" 2.86 146 128 114 102 93 77 142 125 111 100 90 75
6" 3.12 175 155 138 124 112 94 172 151 135 121 110 92
Notes: Spans shown are based on a transverse load testing of panels per ASTM E-72. Thermal effect due to temperature differentials have not been considered. Loads shown do not include a check of the attachment to the supports. Attachment requirements will vary based on the project wind load requirements. Loads shown are based on panels with 26 gauge interior and exterior facings.
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