Roof Truss Design Basics

Bowstring pitched and flat.

Roof truss design basics.

Designing your truss 1. A truss frame consists of a roof truss and a floor truss joined by exterior wall studs. Architectural style types of roofing material methods of support of column framing and relative economy are the principal factors influencing a choice among the three basic types of trusses. If roof slopes are not provided i e if the roofs are flat then it may be very difficult to provide sheet roofing without the use of effective mastic sealing of the sheet joints.

In addition side and end wall height and type roof shape and bracing requirements must be considered. The very first step for building roof trusses is to prepare a design layout that can be sketched by a professional architect or can also be done by using a software that is specifically meant to design a roof truss. A mono truss roof allows for more sunlight and visual space proper drainage and relatively cheaper. It s often used for sheds garages or extension of an existing roof.

Incorporate overhanging top chords to add extra visual flair. Size the bottom chord 0 25 inches 0 64 cm longer than the floor. Slope for roof is necessary to drain off rain water falling on the roof. The pitch of the truss is an important factor in the selection of a truss.

Mono used where the roof is required to slope only in one direction. As we will see below there are several different types of designs and this will impact the angles and designs of the overall truss. A mono truss is a one sloped truss that forms a right angle triangle. Common truss configurations for the most widely designed roof shapes.

The basic design procedure is described in this section in terms of engineering design methodology architectural design examples and design variations. Cut plywood gusset plates to fasten. Start by noting the exact length of the. Also in pairs with their high ends abutting on extremely long spans with a support underneath the high end.

Scissors provides a cathedral or vaulted ceiling. On some roof trusses the 2 top chords extend down over. The information herein is written as an informative guide to residential wood roof truss construction and to provide an understanding of the basic design criteria of wood trusses. The second step in building a roof truss is to prepare the materials needed.