Pratt Truss Roof

This type of truss is used where gravity loads are predominant see below left.

Pratt truss roof.

The pratt steel roof truss design is one of the most common designs. Hayward building systems located in santa maria ca manufactures quality plated wood trusses for residential multi family and commercial projects. In this fashion they form a pattern of interconnected ns. In a conventional pratt truss diagonal members are in tension for gravity loads.

A lap pool with canyon vistas as well as a garden roof terrace take full advantage of the recreational landscape in which the project is sited. The pratt truss was patented in 1844 by two boston railway engineers caleb pratt and his son thomas willis pratt. Pratt truss n truss pratt trusses are commonly used in long span buildings ranging from 20 to 100 m in span. The pratt truss originated from caleb and thomas pratt father and son when they applied for a patent in 1844.

The design uses vertical members for compression and diagonal members to respond to tension. Hayward uses only high quality lumber and precision automated saws and assembly equipment to produce roof trusses for any style and size of roofing system. Horizontal roof rafters. This particular type of truss offers some interesting features mainly thanks to the fact that the vertical members provide tension while the diagonal ones are bringing in compression.

Components of roof truss. It was designed by the thomas willis pratt 1812 1875 and his father caleb pratt a pair of american engineers just several years after william howe patented his famous howe truss design. The pratt truss design remained popular as bridge designers switched from wood to iron and from iron to steel. Beams and columns deflection and stress moment of inertia section modulus and technical information of beams and columns.

A roof truss is a structural unit designed to frame a roof and to support the roof material interior ceiling insulation and forces caused by snow rain and wind. Often seen in bridges it features several vertical chords that are connected by a diagonal chord. Interestingly their patent had less to do with design and more to do with a method for building trusses. This chord runs from the top of one chord down to the bottom of the other chord.

A roof truss is supported by the exterior walls and span the width of the building.