Residential Roof Truss Spans

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.

Residential roof truss spans.

The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers. Shop roof trusses spacer floor truss. These steel joints are needed to support the overall truss. This 26 span truss with a 4 12 roof pitch is the most economical truss we can build.

Keep in mind that these tables are for estimations only. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. Ceiling joist and rafter spans home owners work. You can use sbca s span charts to roughly determine truss sizes available.

Up to 40 open framing for plumbing. 30 diffe types of roof trusses roof truss endix 1 8 13 span tables city of garage attic ion the 30 diffe types of roof trusses. Just as there are many types of roofs with many roof parts there are many different types of roof trusses this extensive article explains through a series of custom truss diagrams the different truss configurations you can use for various roofs. The same thing is true for the bridge of the truss.

Included are a series of representative roof truss span tables that will give you an idea of the truss spans available for a particular load condition load duration lumber type and truss configuration. The same is true if we make it steeper. Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91. Alpine truss designs are engineered to meet specific span configuration and load conditions.

Over 51 sizes styles in stock. Maximum deflection is limited by l 360 or l 480 under live load. Steeper roof pitches require longer webs which add to the cost. These span tables have been prepared for a range of flooring and roofing applications in non cyclonic wind regions using boxspan steel beams and brackets produced by spantec systems pty ltd.

The more complex the truss framework is the greater quantity of these joints will be required. The standard roof truss spacing is 2. Almost all residential trusses use this spacing. Custom trusses up to 100 span.

This is the distance between trusses. This design notes section shall be read in conjunction with boxspan residential span tables non cyclonic areas publication. Garage attic ion the journal board. If we go any larger it will require more webbing inside the truss which will directly affect the cost of the truss.

You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.