The species of lumber size of lumber and the load it carries.
Roof framing 2x6 spanns.
Dead load weight of structure and fixed loads 15 lbs ft 2.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
Beam span maximums are based on a maximum anticipated live load.
For heavy roofs or in.
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.
Also available for the android os.
1 ft 0 3048 m.
If this calculator from the american wood council is to be believed and if my assumptions about your materials and load are correct the max span is about 10ft for a pine 2x6.
Fewer posts on upper level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans.
The table states that 2 x 6 rafters spaced 16 inches on center o c can span a maximum distance of 13 feet 5 inches.
Span length for 2 6 rafters 2 6 shed roof rafters are enough for nearly any type of shed a homeowner wants to build.
Span calculator for wood joists and rafters also available for the android os.
Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.
1 psf lb f ft 2 47 88 n m 2.
The span of a beam is dependent on a few variables.
2 are indicated below.
Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.
Let s use this example and find a size of rafter that will work.
An syp 2 6 rafter at 24 o c.
While a 2 6 might be nearly double the cost of a 2 4 you can likely space the 2x6s further apart negating the added expense of increasing your lumber width.
Maximum rafter spans for a patio roof.
Looking through the center of the table we can find a couple of options.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
This table agrees that 10 12ft is the max span for typical grade lumber at typical spacings for a 5psf dead load.
Live load is weight of furniture wind snow and more.
