Knowledge, Technology, Systems STL has the most UL® Classified building joints systems for static and dynamic applications. User driven products and designs provide the correct tested system for your application. While some manufacturers rely on risky engineering judgments, STL offers tested solutions!


- UL System No. FF-D-1008
- Assembly Rating – 3 Hr
- Movement Capabilities: +- 15% Compress/Extend
- Nominal Joint Width: 4”, Depth of Sealant.
- Forming Material: Nom 4 pcf Mineral Wool to 4”
- Depth.
- Sealant Depth: 1/2”

- UL System No. FW-D-1007
- Assembly Rating – 3 Hr
- Movement Capabilities: +- 15% Compress/Extend
- Nominal Joint Width: 4”, Depth of Sealant.
- Forming Material: Nom 4 pcf Mineral Wool to 4”
- Depth.
- Sealant Depth: 1/2”
