Truss Roof Framing Details

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.

Truss roof framing details.

The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. Construction documents shall be of sufficient clarity to indicate the location nature and extent of work and show in detail that such work conforms to the provisions of the code r106 1 1. You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof. Attic trusses have a rectangular shape inside each truss.

The first approach to achieving a strong durable struc ture involving economical use of materials is to follow a basic modular plan for layout and attachment of framing members. A truss frame consists of a roof truss and a floor truss joined by exterior wall studs. Wood construction data 1. The framing style of the roof refers to the actual components of each roofing truss and the design of the structural foundation of that roof.

Look at this photo of the space created by attic trusses at my home. If the roof slope is steeper than 9 inches in 12 inches of run it doesn t take much width to end up with a nice room 12 feet wide with an 8 foot ceiling. End walls may be truss framed with field assembled stud infill prefabricated in. I have this above my own garage.

Our unparalleled commitment to excellence in our engineering design and sales offices in california and arizona offers full service. A complete load path from peak of roof to the foundation is required r301 1. It is often used in simple roof trusses such as in the shed porch and garage. Trademark construction jmw truss and ace trucking provide full service rough framing coupled with panelized walls open web floor and roof truss systems throughout arizona central and southern california.

Partially these will depend on the style of roof you ve selected but you ll also have some wiggle room depending on the design elements of the house. The wide variety of possible roof and floor truss designs and combinations is illustrated by figure 1. Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters. Floor truss cantilevers often support load bearing walls carrying roof live loads and wall material dead loads.

Details for conventional wood frame construction. Choose the design of the roofing trusses. The chart at left provides a convenient means of determining an equivalent concentrated load for representative roof loads which incorporate a 15 load duration factor for the roof load only. This is the distance between trusses.

It can take various forms and often used for aesthetic purposes adding height and focal interest to the ceiling.