Trussed rafters

Date Published

23 August 2022

Document Type

Category

Author

TRADA
Summary

Widely used for a range of building types, trussed rafters are an economical, versatile and straightforward solution to providing a roof over a building.

Trussed rafters are individually designed prefabricated structural components made from strength-graded timber members of the same thickness, joined together with punched metal plate connectors. Available as a proprietary product from various suppliers, trussed rafter components are manufactured to design code standards. They can be used to provide a structural framework to support a building’s roof fabric, room ceilings and floors.

This Wood Information Sheet focuses on how to design for and install trussed rafter products and is intended for architects, Design > Engineer;s and builders using trussed rafter components. It is an overview of the subject with signposts to more detailed sources that are listed at the end.

Key Information

Trussed rafters are individually designed prefabricated structural components made from strenght-graded timber members of the same thickness, joined together with punched metal plate conectors.

Trussed rafters must be braced to create a rigid and stable roof structure.

Trussed rafters roofs should be insulated to conform to the requirements for thermal transmittance.

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Case studies

In 2003 Meredith Bowles completed a timber frame home for his family and an office for his architect’s practice in the Fens village of Prickwillow near Ely in Cambridgeshire.

The new extension and refurbishment of Emmanuel College Library is a project of considerable subtlety and complexity, with timber used as structure, cladding and internal joinery.