Roof Truss Construction Details

The most common use of trusses is in buildings where support to roofs the floors and internal loading such as services and suspended ceilings are readily provided.

Roof truss construction details. A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc. A truss roof using factory made trusses which are delivered to site complete and just erected. Floor joists over a crawl space may reach seasonal moisture contents in excess of 14 percent. A truss is essentially a triangulated system of straight interconnected structural elements.

Roof floor truss manual 7 31 08 10 43 am page 11 strongback supportscantilever and jack details lateral bracing suggestions 2x6 strongback lateral supports should be located on edge approximately every 10 feet along the floor truss. A truss frame consists of a roof truss and a floor truss joined by exterior wall studs. This type of truss is perfect for the dining room living room great room and kitchen. It can take various forms and often used for aesthetic purposes adding height and focal interest to the ceiling.

The king post roof truss is the simplest of the trusses because of its simple composition. They are designed by the manufacturer for each specific building. It is often used in simple roof trusses such as in the shed porch and garage. Timber trusses also are built in a variety of styles using wood or metal joints.

There are two basic methods of pitched roof construction. They should be securely fastened to vertical webs. Squeak ing floors and loose nails in wallboard or siding can be. In a nutshell it s made up of a central vertical post called the king post two rafters meeting at the apex and a tie beam or the horizontal base.

Pre manufactured roof trusses come in a wide variety of styles. End walls may be truss framed with field assembled stud infill prefabricated in. The dimensions of your structure will determine the angles formed by the truss s top and bottom beams or chords. The main reasons for using trusses are.

Final moisture content of lumber in the building varies with the geographic region and with location in the struc ture. Heavy timber rafters typically spaced 240 cm 8 ft to 370 cm 12 ft apart are called principal rafters. Compare click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to the compare list add to list click to add item 24 spreadweb residential roof truss 5 12 pitch 87 to your list sku 1889754. The wide variety of possible roof and floor truss designs and combinations is illustrated by figure 1.

A truss for a gable roof on one side of your home for example might need to be 15 feet 4 6 m long and 4 6 feet 1 2 1 8 m tall.