Roof Rafter Length Table

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.

Roof rafter length table.

The difference in length of sequential jack rafters spaced 16 o c. The tail or eave overhang must be added to the rafter length. The length of rafter per meter of run is 1 1543. This means that for every 1m the rafter travels horizontally the angled length of the roof will be 1 1543m.

1 1543 x 1 610 1 858m. The run of the rafter. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Includes result for hip valley factor slope factor and the roof slope in degrees.

The length of the rafter. A common rafter will be 13 42 long per foot of horizontal run on a 6 12 slope roof. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. The rise of the rafter.

Rafter length using pitch v r 2 sqrt 1 p 2 where v overhang r roof span p pitch use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead length of roof span pitch or angle. Tail or eave length. This is the rafter length from the top cut to the seat plumb mark. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.

Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. A hip or valley rafter will be 18 long per foot of horizontal run on a 6 12 slope roof. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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.

Height of the scaffold. Enter the value for the roof width outside to outside in feet inches and fraction inches and fraction or use the inches box to enter a value in decimals if that is your preference. Using the 7 inch rise table and our 15 run the common rafter length is 17 43 8.