Johnson Level & Tool Mfg. RAS-1 - Manual (Page 19)

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TAIL OR EAVE LENGTH: Use the same procedure as you
did for the common rafter but remember to use the Hip-
Val column. Again we have in our example a tail 1’ 9” long,
thus giving us:
1 ' Run = 1' 6-3/4"
9" Run = 14-1/8"
1 ' 9" Tail = 2' 8-7/8"
NOTE: If a miter is desired, add for hip or val miter allow-
ance from the tables (see Figures 10 and 13).
HIP-VAL LUMBER LENGTH: Add an allowance for a bottom
plumb cut and, if used, a miter. Obtaining from the table
the allowance for the bottom plumb cut (using a 2 x 6)
FIG. 10 Hip Rafter
Layout.