We use cookies on this site to enhance your user experience. By clicking "I AGREE" below, you are giving your consent for us to set cookies. Privacy Policy

text.skipToContent text.skipToNavigation

Frequently Asked Questions: Insulating the Steel Strong-Wall® Panel

Increasing attention is being paid to energy efficiency and interior comfort. In light of that trend, how do I insulate the Simpson Strong-Tie Steel Strong-Wall® panel?

The Simpson Strong-Tie Steel Strong-Wall® panel is a critical life-safety component that can be insulated like other wall cavities. U-factors for various types of insulation are listed in Table 1 below. Lower U-factors can be achieved with additional layers of exterior rigid insulation.

Table 1
Insulation Type (Exterior/Interior) U-Factor (BTU/hr-ft2-°F)
Wall Size
SSW15X8 SSW18X8 SSW21X8 SSW24X8 SSW24X10 SSW24X12
  1. A “0” for insulation type indicates no insulation.
  2. The SSW is installed so the anchor bolts are visible from conditioned space.
  3. Values based on 2x6 framed walls for SSW24x12; all others based on 2x4 walls.
  4. Values were calculated using the software program Therm 6.0.
  5. Conductivity for materials used are as follows (BTU-in/hr-ft2-°F)
    • Air - Varies
    • Fiberglass Batts – 0.264
    • Loose Fill Cellulose – 0.277
    • Mineral Fiber Insulation (CW90) – 0.347
    • Spray Applied Open Cell Foam – 0.270
    • Spray Applied Closed Cell Foam – 0.140
0/0 0.408
0/Spray Applied Closed Cell Foam 0.19 0.17 0.16 0.16 0.07
0/Spray Applied Open Cell Foam 0.23 0.22 0.22
0/Fiberglass Batts 0.23 0.25 0.22 0.22 0.22 0.10
0/Mineral Fiber 0.28 0.25 0.25
0/Loose Fill Cellulose 0.25 0.23 0.22
Spray Applied Closed Cell Foam/Spray Applied Closed Cell Foam 0.14 0.13
Spray Applied Closed Cell Foam/Spray Applied Open Cell Foam 0.16
Spray Applied Closed Cell Foam/Fiberglass Batts 0.17 0.16
Spray Applied Open Cell Foam/Spray Applied Open Cell Foam 0.20 0.19
Fiberglass Batts/Fiberglass Batts 0.20 0.18