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SR2 Insulated Standing Seam Roof System

With Nucor’s SR2 insulated roof you achieve the look of a traditional standing seam with the benefits of an insulated panel system. The SR2 is field seamed with a hidden fastener joinery which delivers maximum protection from the elements. Its high level of thermal R value leads to energy cost savings, and the trapezoidal rib design provides increased protection and strength against foot traffic damage.

Nucor SR2 insulated standing seam

SR2 Specifications

Thickness 3.25" 4" 5" 6"
R-Value R26 R33 R42 R50
U-Factors .038 .031 .024 .020
Width 40"
Length 8'0" minimum to 50'0" maximum
depending on solar loading
Coatings Exterior: PVDF
Interior: Imperial White (polyester)
Interior Texture Light Embossed
Insulation CFC-free foamed-in-place Polyisocyanurate foam @ 2.2 to 2.5 pcf density
Metal Facings Exterior: 26 ga galvanized steel (24 & 22 optional)
Interior: 26 ga galvanized steel
Offset tongue & groove with concealed fastener. 90° field seamed
Min. Roof Pitch 1/2 : 12

R-values are derived from thermal testing per ASTM C518 @ 40°F mean and ASTM C1363 @ 35°F mean. For project specific values, please contact your sales representative.


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Panel Thicknesses: 3.25”, 4”, 5”, 6”
Insulated standing seam panel
Features and Benefits
  • Field seamed, hidden fastener joinery provides maximum protection against the elements
  • The trapezoidal rib design provides added strength against potential foot traffic damage compared to other standing seam roof products
  • The standard metal surface is 26ga G-90 galvanized steel with standard PVDF and SMP exterior coatings (other coatings may be available)
  • The panel arrives on site in one piece and requires a simple, one-step installation reducing construction time and costs
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