Module: Timber connections Unit: Special connectors

Date Published

20 August 2022

Document Type

Category

Author

TRADA
Summary

There are four criteria designers should take into account when selecting and detailing connections for a particular application: load transfer (stiffness, ductility, robustness and differential movement), appearance, fire resistance and durability.

The traditional mechanical fasteners for structural timber connections are divided into two groups, depending on how they transfer the forces between the connected members: ‘dowel-types’ and ‘metal connectors’.

Key Information

Traditional mechanical fasteners for structural timber connections are divided into two groups: ‘dowel-types’ and ‘metal connectors’.

Special connectors are mechanical fasteners that do not necessarily fall into the above two types of fasteners.

The main special connectors for joining timber members together are: The TU connector by Simpson Strong-Tie, the BSB connector by Blumer and the Cowley Connector.

Case studies

On Tiree, as on other Hebridean islands, the traditional dwelling is the ‘black house’, a small, usually single storey dwelling of white painted rubble walls with a steeply pitched roof of thatch, slate or tarred bitumen.

The Two and a Half Storey House is a masterwork of three-dimensional imagination in timber and an ingenious solution to a common problem: how to create an extra bedroom in a two-storey terrace house.