Let s use this example and find a size of rafter that will work.
I beam roof span.
An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.
Span of beam inches tributary width inches uniform load pounds square foot e g.
The total load is 4 000 pounds.
Sizing a steel beam.
The lengths and sizes of joists vary depending on the species and quality of the lumber used.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
On longer spans the beam may require much more bearing space as indicated by this table.
For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine.
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Yield strength of steel ksi e g.
Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability.
Uniformly loaded simple beam.
Anything 5 and above we always at least double cripple.
F stands for the beam s fiber strength in bending which depends on the species of wood.
Patio roof maximum beam rafter spans.
Wood beam calculator american wood council website rafter and joist span faq.
So if your house is 26 feet wide and the roof ridge beam is centered on the house you will need a rafter that can span 13 feet.
In the example the beam spans the 10 foot width of the roof.
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Have on the system.
For the initial calculation f can be estimated at 1 000.
Shelf z beam boltless steel shelving unit.
For example a 308 span with up to 19 of allow able live load.
L 240 would be 11 29 and l 180 would be 29 of deflection.
Engineered wood products ewp span and size charts for bci joists.
Beam calculator clearcalcs timber steel framing manual single span roof beam steel beam calculator user deflection limit for steel beams supporting masonry parions steel c channel sizes structural.
The maximum spans in the table above are for the horizontal distance the rafter can span not the diagonal distance or actual length of the rafter.
W4 x 13w5 x 165x4x1 4 structural tubingw8 x 10w8 x 13w8 x 18w8 x 21w8 x 24w8 x 31w10 x 12w10 x 15w10 x 19w10 x 22w10 x 26w10 x 30w10 x 39w12 x 14w12 x 16w12 x 19w12 x 26w12 x 30w12 x 35w12 x 40w12 x 45w12 x 50w12 x 53w12 x 58w12 x 65w12 x 72w12 x 79w12 x 87w12 x 96w12 x.
