Owner manual

22
JACK RAFTERS
JACK RAFTER LENGTH: The Jack Rafter Tables are dier-
ent than those for the other rafters. The table lists, in the
first column, the varying center-to-center spacing of the
jack rafters. Then in the second column is the dierence in
lengthfromonejacktothenext(seeFigures14and15).
This dierence in length is to be added to or subtracted
from the rafter length as you progress from jack to jack
(usingthespacingselected).Inourexampleofa8"rise,
andletsassumea24"spacing;wehavea2'4-7/8"dier-
ence in length. Therefore, to obtain the length of the first
or longest jack rafter, measure the distance from the edge
FIG. 13 Valley Rafter
Layout.