Using the 7 inch rise table and our 15 run the common rafter length is 17 43 8.
Roof cuts and rafter lengths book.
Exact lengths of all rafters including all regular and irregular hips valleys commons and jacks.
There are a few good ready reckoners.
Subtract what you are using as a ridge and you have your length perfect every time.
Roof cuts and rafter lengths hancock s 10th edition is a very popular best selling book.
With calculations diagrams and tables.
The most useful book ever if you want to cut a roof.
For larger roofs though i use a roofing ready reckoner.
It will help you with plumb and side cuts for hip and rafter down and side purlin cuts and more.
Rafter book page 1 created date.
Details cuts and bevels for all rafters.
Each page has a different table depending on the pitch angle of your roof with all the figures you need.
Lots of illustrations and easy to follow example problems.
You put in the width and the pitch and this book will give you the full length of the rafter.
This is the rafter length from the top cut to the seat plumb mark.
Gives rafter runs to locate ridges and framing points.
Tail or eave length.
The tail or eave overhang must be added to the rafter length.
The respective lengths for those two rafters and add them together.
Invaluable to anyone who wants to cut a roof by hand and not use trusses.