Types of timber construction

Timber frame

Can be site fabricated (known as ‘stick construction’) or prefabricated in a factory situation delivered to site in panels.

Timber stud

The most common timber framing system would typically use 144/44mm timber studs at 600mm centres when filled with insulation. This would not normally achieve a recommended u-value of 0.1 – 0.15W/m2K, particularly when extra studs have to be inserted for structural reasons around window openings. Therefore additional insulation is required, usually applied externally over the whole frame, covering junctions and studs.

TJI joist system

Truss Joist I-joists or TJI joists have a lot of advantages and offer a relatively economic way to attain low U-values. They are available in many sizes and are structurally strong, with minimal thermal bridging due to the slim compressed timber web.

Double timber studs

This is a relatively simple way of achieving the depth of insulation needed, whilst providing the buildings structure or skeleton.

Larsen trusses

Though not offering structural support to a building, Larsen trusses offer a useful method of containing insulation and giving support for a cladding board and rain screen, such as rendering or timber cladding. Larsen trusses can be used in conjunction with timber framing or masonry walls in new build or retrofit projects. They are very simple to use and can be built on site or prefabricated.

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