Roof trusses

For a rafter framing structure to be strong and resilient, it should be based on solid timber roof trusses. The task of the truss is to transfer loads to the walls or columns. Depending on the span on which the structure is to be placed, the most common types of carpentry trusses are: 

• rafter truss – two rafters supported on a truss board, spanning up to 6 m, 
• collar beam truss – two rafters connected by a collar beam, supported by a truss board, spanning up to 9 m, 
• king post truss – a centrally located post carries several pairs of rafters with the help of binding rafters, single or double post solutions are usually used up to a span of 8 m, 

queen post truss – the most complex type of truss, which is used for spans of 8 m and above. It involves posts called stools, on which are placed transverse roof ties that connect the rafters. Above the roof ties mounted are binding rafters arranged along the roof structure to serve as supports for the rafters.