Raised Collar Roof Design

Collar ties rafter ties tension beams structural ridge beams.

Raised collar roof design.

Un insulated raised tie truss roof. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. Engineered raised tie truss utilising hydraulically press plated treated timber with trusses set at centers in accordance with building regulations and structural engineer s calculation. In accordance with structural engineer s calculations and specification.

In collar tie roof the horizontal tie is raised up from the feet of the rafters to the almost middle of the rafters. We can apply our expertise to omit steel beams where possible from plans which previously specified their use. Some of these can support the roof and prevent ridge sagging and wall spreading. This can lead to an increased likelihood of the rafters spreading under the weight of the roof.

This raised up horizontal tie is known as the collar tie. A collar tie is a horizontal member between two rafters and is very common in domestic roof construction. Raised collar truss also known as a raised tie truss these have a smaller tie beam or collar situated further up the rafters. Collar tie is a colloquial term for collar beam.

Roof layout and pitch as per plan. Collar tie a tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge because of wind or unbalanced roof loads. Collar ties should not be fixed more than one third or one half of the rise of the roof up from the wall plate. This usually has a smaller king post and braces above the collar for increased strength.