Posted by sms on December 14, 2023 at 17:44:30 from (174.203.243.116):
In Reply to: Re: Nobody Knows! posted by DannyE on December 14, 2023 at 16:32:41:
By the way a carpenters rafter square gives common rafter lengths in decimals.
Ridge height and common rafter layout. On the first line of the rafter table (length of common rafters per foot run), the base of the triangle for all the entries is 12. The altitude is the number above the table. Its cleverly hidden in the 24-inch scale along the edge of the square. The hypotenuse of the triangle is provided in the decimalized number just under the number indicating the altitude.
For a 6-in-12 pitch roof, then, assume a base of 12 and look under the number 6 to find the hypotenuse, or 13.42 (see annotated framing square, below). The task now is to expand this little, 6-12-13.42 triangle into a much larger triangle that preserves the angles of the little triangle and fits the roof you are building.
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