Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.
Roof rafter size and spacing.
2 are indicated below.
There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.
If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and.
Live load is weight of furniture wind snow and more.
Here we have a wood framed gable roof.
Floor joists ceiling joists rafters snow load rafters roof live load deflection limit.
2x4 2x6 2x8 2x10 2x12.
Floor beam span tables of residential structural design we will now look at roof rafter and beam design.
Rafters must be strong enough to hold the roof sheathing and the shingles.
It is always better to have a large rafter rather than be concerned with a sagging roof.
Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.
1 psf lb f ft 2 47 88 n m 2.
Continuing on from part 3.
Let s consider a basic gable wood roof framing design.
Spacing in 12 16 19 2 24.
L 720 l 600 l 480 l 360 l 240 l 180.
If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.
So the space between rafters can be greater without reducing the maximum span.
For instance 2 grade 2x4s at 16 on center will span just over 9.
If your local building authority has a rafter spacing code you may not space rafters wider than required by code.
For standard shed roof rafter spacing see rafter span chart.
Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet.
Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof.
Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.
3 stud construction standard utility.
Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.
1 ft 0 3048 m.
The same concept holds true for roof trusses.
The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.
