Free Span Roof Trusses

The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

Free span roof trusses.

The same thing is true for the bridge of the truss. The more complex the truss framework is the greater quantity of these joints will be required. Each truss bears the truss plate institute tpi stamp for quality assurance. 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.

Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run. These steel joints are needed to support the overall truss. The rise will be the elevation change over the 12 inches. 24 28 30 32 34 36 38 40 42 44 48 50 60 truss.

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. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. As well running an attic air duct system can be very difficult if the roof trusses were not designed for that application. Residential trusses save time and materials compared to conventional hand framing.

Truss capacity is. Alpine truss designs are engineered to meet specific span configuration and load conditions. The lumber components are precision cut and assembled together with galvanized steel truss plates in a factory controlled environment. The run or the base number is 12 inches.