Roof Truss Design Basics

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.

Roof truss design basics.

A mono truss roof allows for more sunlight and visual space proper drainage and relatively cheaper. Residential roof trusses as shown in figure a are an engineered configuration of wood members placed to hold the weight of the roof s finishing materials the internal structure s ceiling and any snow load that may occur. A truss frame consists of a roof truss and a floor truss joined by exterior wall studs. Cut plywood gusset plates to fasten.

The second step in building a roof truss is to prepare the materials needed. Scissors provides a cathedral or vaulted ceiling. On some roof trusses the 2 top chords extend down over. As we will see below there are several different types of designs and this will impact the angles and designs of the overall truss.

It s often used for sheds garages or extension of an existing roof. A mono truss is a one sloped truss that forms a right angle triangle. 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. Designing your truss 1.

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 truss is a framework consisting of rafters posts and struts which supports your roof. Bowstring pitched and flat. 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.

Designs 1 3. Common truss configurations for the most widely designed roof shapes. Size the bottom chord 0 25 inches 0 64 cm longer than the floor. Incorporate overhanging top chords to add extra visual flair.

Start by noting the exact length of the. The pitch of the truss is an important factor in the selection of a truss. Also in pairs with their high ends abutting on extremely long spans with a support underneath the high end. In addition side and end wall height and type roof shape and bracing requirements must be considered.