Truss Rafter Roof Construction

The wood needs to be cut based on the size of the roof and specifications in the design.

Truss rafter roof construction.

Shop our wide selection of stock and custom roof trusses to complete your building project available in a variety of styles and sizes. Roof trusses are engineered wood alternatives to hand framed rafters. Keep the framing square in the position that it was set in to measure the birdsmouth cut. The bottom chord which is the bottom of the framed truss.

A roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. Measure the rafter overhang. These will include wood a hammer a saw roof truss plates made from galvanized steel and galvanized screws of 1 inches. Fink trusses were originally invented for the purpose of beefing up bridges but many contractors now use them to increase the strength of interior structures.

Examples of live loads are snow wind rain and temporary construction loads. Build a fink truss to bolster a floor roof or deck. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. The benefit of a truss over older structural designs like coupled rafters is that it provides longitudinal support.

Then there is the top chord or rafters that are angled to make the roof pitch. Finally there are the gussets that hold the framed truss together. Just enter the dimensions of the roof rise and run to get started. In essence a roof built on trusses is much more structurally sound.

If for example you want the rafter to overhang the edge of your building by 6 inches 15 cm measure this now. In a fink truss the internal joists are arranged in a w shape ensuring even weight distribution from one end to the other. They support live and dead loads by efficiently transferring the loads to the building walls or supports. The boards creating the slope of the roof are wider than lumber used to build trusses 2x8s 2x10s and 2x12s are most common in rafters vs.

The second step in building a roof truss is to prepare the materials needed. Slide the framing square until the 6 in 15 cm mark intersects the line you ve marked for the birdsmouth cut. If you re building rafters and aren t sure where to start when determining the length of your lumber you re in the right place our rafter stock size calculator shows you how long your rafters should be so you ll know what you need in terms of framing lumber dimensional lumber studs and more. The method that utilizes rafter roof construction is generically known as stick framing the rafters are lengthy planks usually 2 x 10s or 2 x 12s that slope down from the central ridge beam at the peak of the roof intersecting with the outside walls.

Live loads are not always present.