Roof Rafter Length Tables

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

Roof rafter length tables.

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. 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. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. All we do now is use a calculator to multiply 1 610 by the measurement in the book.

Includes result for hip valley factor slope factor and the roof slope in degrees. The rise of the rafter. The respective lengths for those two rafters and add them together. Height of the scaffold.

Tail or eave length. The run of the rafter. The tail or eave overhang must be added to the rafter length. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will 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 length of the rafter. 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. The table will provide full scale.

So this table could accommodate a house with a total rafter span or house width of 32 feet. 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. Using the 7 inch rise table and our 15 run the common rafter length is 17 43 8. 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.

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. The length of rafter per meter of run is 1 1543. 1 1543 x 1 610 1 858m.