Johnson-level-tool-mfg RAS-1 Uživatelský manuál Strana 14
- Strana / 67
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
12
atailrunof1'9".Inthesame“Common”tableasused
above,foran8”rise,wend:
1' Run = 1' 2-1/2"
9" Run = 10-7/8"
1' 9" Tail = 2' 1-3/8"
COMMON RAFTER LUMBER LENGTH: To obtain the total
length of the rafter, an allowance for the bottom plumb cut
mustnowbemade(seeFigure4).Thisallowancecanbe
obtainedbyusingthetables.Inourexample,letususea2x
6pieceoflumberwhichwillgiveusadepthof51/2inches.
Fromthebottomallowancetable(using8"riseagain),the
commonandjackallowanceequals3-11/16inches.Thetotal
common rafter lumber length then becomes:
RAFTER LENGTH = 15' 7-1/2"
TAIL = 2' 1-3/8"
BOTTOM ALLOWANCE = 3-11/16"
TOTAL LUMBER LENGTH = 18' 0 9/16"
COMMON RAFTER LAYOUT
STEP 1. TOP PLUMB CUT: In choosing the side of your
raftertouse,putthecrown(highside)upiftherafter
is not straight. Now starting at the top of the rafter, lay
oursquareonthefaceoftheraftersothatthe“T”bar
isdrapedoverthetopedgeoftherafter(seeFigure6).
While holding the pivot point firmly against the edge of
therafter,pivotthesquaresothatthenumber8onthe
common scale lines up with the edge of the rafter. Starting
from the pivot point, mark the top plumb cut line along
the top edge of the square.
STEP 2. SEAT NOTCH OR BIRD’S MOUTH: With your rafter
length(inourexample15'7-1/2"),measuredownalongthe
top edge of the rafter and mark another plumb line as you
did in Step 1. This line represents the outside wall of your
- Johnny Square 1
- TABLE OF CONTENTS 5
- TYPES OF RAFTERS 6
- RAFTER MEASUREMENTS 8
- FIG. 3 The Common Rafter 10
- COMMON RAFTERS 11
- FIG. 4 Common Rafter Layout 12
- COMMON RAFTER LAYOUT 14
- HIP AND VALLEY RAFTERS 17
- FIG. 10 Hip Rafter 19
- HIP RAFTER LAYOUT 20
- INTERSECTION OF HIPS ON RIDGE 21
- VALLEY RAFTER LAYOUT 22
- JACK RAFTERS 24
- JACK RAFTER LAYOUT 27
- DORMER RAFTERS 28
- DOOR OVERHANG 28
- DEGREE SCALE 29
- STAIR LAYOUT EXAMPLE 30
- FIG. 18 Stringer Layout 32
- FIG. 19 Step Layout 34
- SOLAR PANEL SUPPORT EXAMPLE 36
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