For Structural Engineers

Test data

• AISI uplift and gravity base test reports (Force Engineering & Testing, 2008–2009): 8" × 2.5" Z purlins (14 and 16 ga), 25-foot bay, 3-1/2" 16 ga TopHat under 26 ga panel.
• How the subframe raises purlin capacity, with the tested factors.
• These are AISI base tests of the purlin system. They are not ASTM E1592 panel-assembly tests. See testing and approvals for the full status.

Design approach

• Sub-framing members and connections designed per the AISI specification, with loads per ASCE 7 and the governing building code.
• Tested purlin factors can be used for configurations the tests cover; other configurations need engineering judgment or project-specific analysis.
• Edge and corner zones: Deflection Limiters provide attachment points between existing purlins for closer framing spacing.
• Check fastener pull-out from the existing purlins (field pull-out testing where the existing steel's condition is uncertain) and the primary frames for any new load.

Added loads

For solar arrays, sprinkler systems, rooftop units or increased snow and wind design loads, the TopHat Subframe provides the new roof support and braces the existing purlins in the same installation. See solar on older metal buildings.

Engineering support

TopHat Framing Systems can provide an engineering and shop drawing package for a project, and can work with the engineer of record on delegated design. Send the building geometry, purlin size and spacing, existing panel, and loads.

• Standard details (PDF and DWG)
• Specification and product data