{"id":578,"date":"2026-08-17T05:56:55","date_gmt":"2026-08-17T05:56:55","guid":{"rendered":"https:\/\/ubcbim.com\/blog\/?p=578"},"modified":"2026-08-17T09:38:24","modified_gmt":"2026-08-17T09:38:24","slug":"cold-formed-steel-services-in-usa-2","status":"publish","type":"post","link":"https:\/\/ubcbim.com\/blog\/cold-formed-steel-services-in-usa-2\/","title":{"rendered":"Engineering a Hip-Roof Residential Project: From Attic Constraints to Reliable Roof-to-Wall Connections"},"content":{"rendered":"

Project Overview<\/strong><\/h3>\n

Residential Light Gauge Steel Home with hip roofs often present unique coordination and engineering challenges. Roof geometry directly influences the available attic space, framing configuration, and connection requirements.<\/p>\n

This single-storey residential project in Los Angeles, USA<\/a> of area 2,853 sq. ft. <\/strong>,was designed with a light gauge steel framing using hip roof<\/a> and Scope of work includes engineering, 3D modeling, detailing, and permit-set.<\/p>\n

One of the key design considerations was the variation in available attic space. Changes in roof slope created different attic volumes across the building, making accurate roof geometry and framing coordination essential. \u00a0Building information modelling services from LOD 100 to LOD 500 in USA for both light gauge steel and timber framed structures<\/a><\/p>\n

Engineering Around Variable Attic Spaces<\/strong><\/h3>\n

A hip roof does more than define the building’s appearance\u2014it directly affects the structural framing and usable space below it.<\/p>\n

Because the roof slopes and framing geometry change across the building, the available attic volume is not uniform. Accurate modeling helped establish the roof geometry and coordinate the framing around these changing conditions.<\/p>\n

Through detailed 3D modeling, the roof framing could be reviewed digitally before fabrication or construction, helping ensure that the structural solution aligned with the architectural requirements.<\/p>\n

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Roof Truss Design<\/strong><\/h3>\n

For the roof trusses, H3 \/ 1.5\u201343 50 ksi profiles were used to provide the required strength and durability for the project.<\/p>\n

The truss design was developed around the project-specific structural requirements while maintaining accurate geometry for detailing and downstream fabrication.<\/p>\n

This approach demonstrates the importance of connecting structural engineering with detailed BIM modeling\u2014particularly when roof geometry and available attic space vary throughout a residential building.<\/p>\n

Reliable Truss-to-Wall Connections<\/strong><\/h3>\n

A structurally sound roof system depends not only on the trusses themselves but also on how those trusses connect to the supporting walls.<\/p>\n

For this project, LS 90 and RCA 223 connectors were used for the truss-to-wall connections. These connections provided a consistent interface between the roof framing and wall system.<\/p>\n

The connection strategy also supported the drywall system by maintaining continuity from the ground level through to the roof. This required careful coordination between the structural framing, connections, and architectural requirements.<\/p>\n

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Consistency Across the Reframe<\/strong><\/h3>\n

The same connection approach was implemented for the mirror building reframe.<\/p>\n

Maintaining a consistent connection strategy across both conditions helped simplify coordination while supporting structural stability and performance. It also reduced the risk of introducing unnecessary variations during detailing and construction.<\/p>\n

The Role of BIM in the Process<\/strong><\/h3>\n

This project highlights how BIM can connect engineering decisions with detailed construction information.<\/p>\n

By developing the framing digitally, the team could coordinate:<\/p>\n