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Using DEWALT RAFTER SQUARE (continued)
4) Square the top of the plumb lines across the top of the rafter.
Note that in the case of a valley-jack rafter, the top of the rafter is on the
'short' side of the plumb line-that is, just the opposite side of a hipjack!
5) Depending on which way the side cut is to be made, connect
opposite ends of the square lines.
6) From Table 2, "Difference in Length of Jack Rafters for Various
Spacing." the length given for 9 inch rise per foot run on 16 inch
centers is 1 foot, 8 inches. This is also the length of the first, or shortest,
hip-jack or valley-jack rafter. Each succeeding jack rafter will be 1 foot,
8 inches longer than the preceding one!
7) Along the measuring line (the center line on top of the rafter),
and from the side cut line marked in Step 5), measure and mark the
length of the rafter. The first rafter will be 1 foot, 8 inches long, the
second rafter 3 feet, 4 inches long (2 times 1 fool, 8 inches), the third
rafter 5 feet, 0 inches (3 times 1 foot, 8 inches), and so on!
VALLEY JACK RAFTER
HIP JACK RAFTER
HIP JACK RAFTER
VALLEY JACK RAFTER
JACK LENGTH
JACK LENGTH
HIP JACK RAF TER
VALLEY JACK RAF TER
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