Roof Rafter Length Table

The run of the rafter.

Roof rafter length table.

A common rafter will be 13 42 long per foot of horizontal run on a 6 12 slope roof. The rise of the rafter. This is the rafter length from the top cut to the seat plumb mark. The length of the rafter.

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. The length of rafter per meter of run is 1 1543. Height of the scaffold. Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

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. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. 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. The respective lengths for those two rafters and add them together.

This means that for every 1m the rafter travels horizontally the angled length of the roof will be 1 1543m. 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. Will be 17 88 long on a 6 12 slope roof. A hip or valley rafter will be 18 long per foot of horizontal run on a 6 12 slope roof.

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. 1 1543 x 1 610 1 858m. All we do now is use a calculator to multiply 1 610 by the measurement in the book.

Tail or eave length. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. The tail or eave overhang must be added to the rafter length.