Raised Collar Roof Design

Roof layout and pitch as per plan.

Raised collar roof design.

A collar tie is a horizontal member between two rafters and is very common in domestic roof construction. 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 rafter ties tension beams structural ridge beams. Advanced roof design techniques with raised tie trusses ets design raised tie trusses using advanced practises such as reinforcing rafters.

Often collar ties are structural members but they may be used simply to frame a ceiling. Collar ties should not be fixed more than one third or one half of the rise of the roof up from the wall plate. Collar tie is a colloquial term for collar beam. By doing this we can produce working trusses with higher collar heights and larger spans.

We can apply our expertise to omit steel beams where possible from plans which previously specified their use. In accordance with structural engineer s calculations and specification. 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. This raised up horizontal tie is known as the collar tie.

Raised collar truss also known as a raised tie truss these have a smaller tie beam or collar situated further up the rafters. Some of these can support the roof and prevent ridge sagging and wall spreading. 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 collar tie roof the horizontal tie is raised up from the feet of the rafters to the almost middle of the rafters.