Old Roof Rafter Size

Just enter the dimensions of the roof rise and run to get started.

Old roof rafter size.

Rafter spacing and roof length will be used to determine quantity of rafters needed for your project. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Click the button to calculate the stock size needed for this job. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and rafter spacing.

Input the rafter span on the flat eave overhang and pitch of the roof. For standard shed roof rafter spacing see rafter span chart. Lumber size width 2x8 2x10 or 2x12 boards will be used to estimate cost of each rafter as well as total cost excluding local sales tax. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.

For instance 2 grade 2x4s at 16 on center will span just over 9. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.