Johnson-level-tool-mfg RAS-1 Uživatelský manuál stáhnout pdf (Strana 22)

Nowmarkacrosstopofridge(asshown).Thismarkwillbe

the center of the two intersecting hips. If a common rafter

is to be used, the ridge will be cut o at this mark and the

commonrafterbuttedupagainstit(seeFigure9).Ifno

commonrafterwillbeused,cuttheridgeabout2"longer.

This will allow you to nail through the ridge into the hip.

VALLEY RAFTER LAYOUT

STEP 1. TOP PLUMB CUT:

Using the Hip-Val scale again,

make the top plumb mark in the usual way. Now measure

down the top of the rafter from this mark for a miter allow-

ance,ifused(seeFigures12and13).Lookuptheallowancein

the Tables under the rise and the rafter thickness that you are

using(inourexample:8"riseand1-1/2"actualrafterthickness,

resultingina7/8"allowance).Thenmaketwoplumbmarkson

both sides of the rafter for the top plumb bevel cuts.

STEP 2. SEAT NOTCH: From the ﬁrst top plumb mark,

measuredowntherafterlength(inourexample:20'3-7/8")

andmaketheseatplumbmark(seeFigure13).Now,go

down the rafter from the seat plumb mark the miter al-

lowancedistance(foundinthetableforyourinchriseand

actual rafter thickness) and make a plumb line for the miter

allowance. Draw the same miter plumb line on the other

side of the rafter for making the bevel cut. This mitered seat

cut will allow the valley rafter to ﬁt down over the crotch

formedbythejoiningwallplates(seeFigure12).Next,to

make the horizontal seat mark, measure down to the seat

depthontheseatplumbmark(notthemiterplumbline).

Aligning the dashed line on our square with the seat plumb

mark, draw a perpendicular line using the bottom edge

ofourSquaretotheedgeoftherafter.Alsoextendthe

horizontal seat mark to the added miter allowance plumb

line(seeFigures7and13).Doublechecktoseethatallseat

notches are the same depth.

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Johnson-level-tool-mfg RAS-1 Uživatelský manuál Strana 22