Roof Collar Ties Definition

2x6 collar tie is located about 30 below the bottom of the ridge board.

Roof collar ties definition.

The 2015 international residential code does not require collar ties or collar beams. A collar near the bottom of the rafters may. A collar tie is a horizontal roof rafter compression connector that is located in the uppermost third of the span of a pair of opposed sloped or gable roof rafters. A collar tie is a horizontal member between two rafters and is very common in domestic roof construction.

A collar beam is often called a collar tie but this is rarely correct. A collar tie is a tension tie in the upper third of opposing gable rafters that is intended to resist rafter separation from the ridge beam during periods of unbalanced loads such as that caused by wind uplift or unbalanced roof loads from snow. When a framer installs collar ties he or she must place them horizontally against one side of the roof rafters and in the top third of the vertical distance between the ridge board and the plane of the top plates of the exterior walls. Often collar ties are structural members but they may be used simply to frame a ceiling.

Previously these 2x6 members were at the top plate level acting as ceiling joists rafter ties but it s been opened up to create an open space. By upper third here we mean one third of the length of the rafter from ridge to top plate. This is done is to stabilize the connection between the ridge board and the tops of the rafters. In collar tie roof the horizontal tie is raised up from the feet of the rafters to the almost middle of the rafters.

Often a collar is structural but they may be used simply to frame a ceiling. A tie in building construction is an element in tension rather than compression and most collar beams are designed to work in compression to keep the rafters from sagging. 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 tie is a colloquial term for collar beam.