Timber Frame Truss Spans

The size of a timber truss is an important part of designing a building and while there are no set maximum sizes there are some best practices.

Timber frame truss spans.

A timber frame truss roof with ridge beam purlins and common rafters is a stunning combination that creates visual interest and structural complexity. Under 18 foot trusses have 8x8 and 6x8 main members. Standard stud construction typically requires only 3 studs. For example an 8 10 metre span for a timber truss is quite a long one and can lead to problems.

With a 50 foot truss this would definitely be the case. Timber frame covered bridges. The basis of timber truss design concepts. Framing to truss connection engineering and connection hardware included.

Trusses we offer multiple timber frame truss designs including the five basic timber frame trusses and variations of those truss systems. The king post timber truss handles long spans and heavy load conditions. Ideally it is better to subdivide this into a main frame of around 5 metres with a 2 5 metre aisle on each side. As the core component in any timber framing project trusses create the impressive grandeur and warmth associated with exposed beams and rafters.

Trusses must be designed for any special loading such as concentrated loads from hanging partitions or air conditioning units and snow loads caused by driftingnearparapetorslide offfromhigherroofs. Structural t groove decking 1x 2x 3x or 4x in spruce or douglas fir. Modified king post trusses are are especially good for when more visual height is desired in the building plan. Each truss style can be modified heavily but these classifications will fit most timber trusses in the post and beam world.

Above these components is a rack of common rafters. Usage of timber frame trusses is highly dependent on the houses or structures square footage roof lines both pitch and context of other rooflines overall spans design preferences and structural requirements. Queen post timber truss. Hand hewn or smooth finish is available.

All trusses shown can be delivered fully assembled. Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. Spaced sheathing or 1x boards may be reduced slightly. Our standard wood species is free of heart douglas fir which yields minimal cracking.

Flexible design with span pitch and on center spacing. There is a hierarchy of timber framing at work here with trusses supporting the ridge and purlin beams.