Johnson-level-tool-mfg RAS-1 Manual do Utilizador descarregar pdf (Página 26)

distance from the edge of the last common rafter to the

intersection of the hip and ridge, or the valley and top

plate(foravalleyjack).Thismeasurementiscalled(P)

inFigures14and15.Nowsubtractthemeasurement(P)

fromthespacingyouareusing(W).Theresult(W–P)is

the distance from the intersection of the hip and ridge to

the ﬁrst hip jack or the plate corner to the ﬁrst valley jack.

Look in the table for this distance and ﬁnd the length to

deductfromthecommonrafterlength.Inourexample

again,letustakeameasurmentof12"fromthecommon

rafter far side edge to where the hip intersects the ridge

(W–P=24–12=12).Therefore:

FIG. 15 Top View of Valley Jack Rafter Spacing.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 66 67

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Johnson-level-tool-mfg RAS-1 Manual do Utilizador Página 26