Roof Rafter Length Tables

If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

Roof rafter length tables. The run of the rafter. The respective lengths for those two rafters and add them together. The length 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.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. The full scale number will be the length of the rafter in inches for each foot of horizontal run distance.

Tail or eave length. So this table could accommodate a house with a total rafter span or house width of 32 feet. Height of the scaffold. Includes result for hip valley factor slope factor and the roof slope in degrees.

The length of rafter per meter of run is 1 1543. 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. 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. This is the rafter length from the top cut to the seat plumb mark.

The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter. The tail or eave overhang must be added to the rafter length. This means that for every 1m the rafter travels horizontally the angled length of the roof will be 1 1543m. The rafter tables allow you to calculate the length of a rafter by choosing a full scale number that matches the unit rise slope or angle of the roof.

1 1543 x 1 610 1 858m. The table will provide full scale. All we do now is use a calculator to multiply 1 610 by the measurement in the book.