Free Span Roof Trusses

Residential trusses save time and materials compared to conventional hand framing.

Free span roof trusses.

Truss capacity is. Alpine truss designs are engineered to meet specific span configuration and load conditions. Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20. Dec 15 2013 free truss plans.

For example a slope of 6 12 means for every 12 inches of horizontal distance the slope of the roof will rise 6 inches vertically. The rise will be the elevation change over the 12 inches. Trusses are professionally designed with state of the art computer programs. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.

The lumber components are precision cut and assembled together with galvanized steel truss plates in a factory controlled environment. The more complex the truss framework is the greater quantity of these joints will be required. The same thing is true for the bridge of the truss. Roof truss design 1 24 span 2 web with plywood gussets figure 1 figure 1 roof truss 24 span 2 web with plywood gussets detailed information for a 2 web roof truss with a 24 span with plywood gussets.

Each truss bears the truss plate institute tpi stamp for quality assurance. As well running an attic air duct system can be very difficult if the roof trusses were not designed for that application. The run or the base number is 12 inches. Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run.