Johnson-level-tool-mfg RAS-1 Uživatelský manuál stáhnout pdf (Strana 20)

andamiterallowance(usinga11/2"actualrafterthick-

ness) we get:

RAFTER LENGTH = 20' 3-7/8"

TAIL LENGTH = 2' 8-7/8"

BOTTOM PLUMB ALLOW. = 3-11/16"

MITER ALLOWANCE = 7/8"

LUMBER LENGTH = 23' 5-5/16"

 NOTE:Onlyaddmiterallowancesiftheyareused.

HIP RAFTER LAYOUT

STEP 1. TOP PLUMB CUT: The square is used in the same

manner as in Step 1 of the common rafter top plumb cut.

Butnow,readtheInch-RiseontheHip-Valscaleinstead.

Remember that the top plumb cut is a bevel cut and that

oppositerafterswillhaveoppositebevelcuts(seeFigures

9and10).Thereforewhenplacingthesquareontherafter,

placeitonthelongsideofthebevel(thebevelcutwillbe

explainedinStep4).

STEP 2. SEAT NOTCH: Measure the rafter length down

along the top of the rafter and make the seat plumb mark

inthesamemannerasyoudidforthecommonrafter(in

ourexampleitis20'3-7/8").Next,measurealongtheseat

plumb mark the seat depth and using the dashed line on

the square, draw a perpendicular line for the horizontal

seatmark(seeFigure10).Besureallhorizontalcutsforall

rafters are the same distance from the top edge of the raf-

ter at the wall line. For the proper ﬁt of the hip rafter, cut

thetopwallplatecornero(asshowninFigure9).This

allows Hip seat notch to set in against a full ﬂat corner,

rather than against an outside point.

STEP 3. TAIL OR BOTTOM PLUMB CUT: Measure down the

top of the hip rafter from the seat plumb mark and mark

thedistanceforthetail(inourexample2'8-7/8").Using

our square, make the bottom plumb mark. If a tail miter is

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Johnson-level-tool-mfg RAS-1 Uživatelský manuál Strana 20