Queen post TrussĪ Queen post truss is used for roof covering. It is used for building spans between 5-8m. It also consists of inclined members called strut which prevent the principal rafter from bending. It is triangular in shape with vertical post at its center which is known as king post. This type of truss is also used for supporting building roof. But it is not preferred for structures where there are concentrated or point loads. This type of truss is suitable for structure where we want to distribute the load uniformly. The benefit of warren truss is that it distributes the load of the structure evenly on different members due to its equilateral shape.

This truss has its inclined member in such a way that it forms an equilateral triangle. Warren TrussĪnother type of popular truss is warren truss which consists of horizontal, vertical and inclined members. This type of truss is suitable for horizontal spans like railway bridges where loads are in vertical direction. The cost of construction of this truss is less due to high efficiency of also reduces self-weight and construction of this type of truss is easy. The Pratt truss has been in use over century because of its effective truss application. The load distribution in such a way that vertical members are in compression and diagonal members are in tension. Pratt TrussĪ Pratt truss consists of vertical, horizontal and diagonal members. They are not recommended for installation on load bearing beams or walls. It is similar to raised tie truss but only difference is that it has lower member sloping which give more strength to a truss structure. The scissor type truss is also used in construction, and it forms vaulted ceiling. It is suitable for increasing the height of room without increasing the height of building. Raised tie trusses are triangular shaped trusses which are used to provide a higher ceiling line for extra headroom. You can also find it by names like Pent or Aisle Roof. It consists of single common rafter only and is the simplest type of truss.

Web support – Types of roof trusses Mono TrussĪ mono truss is right angle triangle shaped truss which is used for verandah or shed covering support.King Post – The top of the common truss highest support is the king post.Metal Gussets – It’s the joint where web support and king post overlap the top and bottom chord.Bearing point – The location where the outside bearing wall gets beneath the truss.Bottom chord – Your finished ceiling is mounted on the bottom chord.Top chord – Roof sheathing goes on top of this member.Prefab Trusses – roof trusses Parts of prefab roof trussesĪ roof truss consists of following main parts Triangle shape of trusses is very efficient for finite control of load that’s why they are preferred in construction.Ī truss has to support the weight of ceiling so it should be strong and stable, and all these features are available in triangular shaped trusses. Trusses are normally made triangular in shape and these triangular shapes will in various configurations to fit the pitch, design of ceiling and size. The prefabricated trusses are made in factories and then transferred to site and place after construction of building walls. Trusses are further sub divided into different types and specific roof truss is selected on the basis of span length of building, loading conditions and suitability of truss for that roof construction. There are two main types of trusses flat and pitched. a truss that’s going to be built in the factory with no assembling on job-site.Ī roof truss is a prefabricated structure usually of triangles which is designed to support the roof covering or ceiling over rooms of building. There’re different names to the prefabricated trusses like prefab trusses or pre-built trusses – but all means the same thing i.e. These types of trusses allow general contractor to maintain superior speed and precision during erection of complicated roof and ceiling designs. That’s probably because of the cost and the convenience. Nowadays a lot of homeowners are deciding to get prefab trusses or prefabricated trusses during new roof or roofing replacement.

Pre fab metal roof rafter spacing