Kelbrick's Roof Trusses - News & Views

Kelbrick's News and Views will inform you on the latest news, trends and advice on SABS approved roof trusses in South Africa.

Prefabricated Roof Truss Construction: 7 Deadly Sins

Prefabricated Roof Truss Construction: 7 Deadly Sins

The Seven Deadly Sins of Trussed Rafter Construction - Brian Margetson, Local Architects Direct


With an excess number of Roof Trusses (herein after called trussed rafters) there has been, to date, no known failure of a trussed rafter “ex-factory” condition, a remarkable safety record.  Kelbrick’s Roof Trusses provides you with the information on how trussed rafters work, their strengths and their limitations. Common misunderstandings are examined that will hopefully costly and obstinate modifications.

Trussed rafters are defined as triangulated timber frameworks positioned at close centres (generally 600mm) to form roof structures.  Trusses are engineered to suit the application requested.  Roof Truss manufacturers use very sophisticated software (known as the system owners) such as MiTek to design the trusses, produce quotations, manufacture information and produce data.

The advantage of trussed rafters is that it enables architects the freedom with the layout of the upper floor by avoiding the need for internal load bearing walls. Consequently, the ground floor layout and upper floor layout need no longer harmonise.

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