Timber Frame Truss Spans

Modified king post trusses are are especially good for when more visual height is desired in the building plan.

Timber frame truss spans.

As the core component in any timber framing project trusses create the impressive grandeur and warmth associated with exposed beams and rafters. Standard stud construction typically requires only 3 studs. With a 50 foot truss this would definitely be the case. 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.

Queen post timber truss. The basis of timber truss design concepts. All trusses shown can be delivered fully assembled. This truss used in conjunction with heavy timber attic or collar tie trusses works well in a loft area a great room or for an entryway.

A timber frame truss roof with ridge beam purlins and common rafters is a stunning combination that creates visual interest and structural complexity. Hand hewn or smooth finish is available. 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. Structural t groove decking 1x 2x 3x or 4x in spruce or douglas fir.

Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. Spaced sheathing or 1x boards may be reduced slightly. The reason for this is that the roof pitch span spacing species of wood and the location of the building can really affect the size of the timbers and geometry of the truss. Under 18 foot trusses have 8x8 and 6x8 main members.

The king post timber truss handles long spans and heavy load conditions. Above these components is a rack of common rafters. Timber frame covered bridges. Ideally it is better to subdivide this into a main frame of around 5 metres with a 2 5 metre aisle on each side.

Flexible design with span pitch and on center spacing. For example an 8 10 metre span for a timber truss is quite a long one and can lead to problems. Each truss style can be modified heavily but these classifications will fit most timber trusses in the post and beam world. There is a hierarchy of timber framing at work here with trusses supporting the ridge and purlin beams.

Trusses 18 foot and above have 8x10 and 6x10 main members. Framing to truss connection engineering and connection hardware included.