Timber Trusses not only append beauty and style to your home's decoration but they can be planned to bear the load of the roof. Care must be taken with the nature of wood and the quality of the timbers used for timber trusses.

Timber trusses are used in constructions to transmit the load from the roof to the foundation through the walls. The basic mechanisms of a treated timber trusses are two principal beams tied together with a tie beam to outline a triangle. Vertical and angled timber posts within the triangle provide stability and stiffness to the whole structure.

Usually, timber members connected together with mortise and tenon joints and wooden pegs. This has been substituted by the use of steel plates and bolts. Timber trusses are generally divided into closed and open trusses. Closed trusses holds of a total tie beam that shape a triangle with the rafter and Open Timber Trusses consist of limited or no-tie beams. Here are the few models of treated trusses,

King Post Truss

A king post truss consists of a straight up king post that connects the center of the tie beam to the edge of the rafters. Angled rods are usually used as additional element to join the king post and the rafters. The king post truss model is a good example of a closed truss.

Queen Post Truss

A queen post truss consists of two vertical queen posts that are joined at the same distances from the center of the attach beam to the rafters. They are also attached by a horizontal member at the top. These treated trusses can extent greater widths than a king post truss.

Pratt Truss

A Pratt truss consist more number of vertical posts amid the tie beam and the rafters. They are joined with angled struts between them, with the angles in the similar direction as the rafters. A north light truss is a mono pitch difference of a Pratt truss.

Howe Truss

Howe trusses have a similar arrangement to that of Pratt truss, with the angles in the reverse direction to the rafters. Parallel and metal models of these trusses were broadly used in bridge construction.

Scissor Truss

A scissor truss is comparably similar to a king post truss, with the tie beam restored by two angled component that meet the rafters. This allows for additional height in the middle of the room and fashions an inclined internal ceiling. This truss needs extra support at the walls because it has a natural tendency to stretch out without a tie beam. This is an example of an Open Treated Trusses.

Hammer-Beam Truss

A hammer-beam truss takes out the middle sections of the tie beams and horizontal members to shape an internal stepped profile. The size of the space created is one of splendor and has been used in buildings such as cathedrals and great halls. The truss is hold by external structures called buttresses to neutralize the lateral forces of the truss.

Source: http://www.gulfcoasttreated.com/