Johnson-level-tool-mfg RAS-1 Manuale Utente Scaricare il pdf (Pagina 10)

FIG. 3 The Common Rafter.

Then the run is found by dividing in half the building width.

Whenaridgeboardisbeingused,deduct1/2itsthickness

from the run.

STEP 2. OBTAIN ROOF RISE: Find the distance you wish the

roofridgetobeabovethewall(infeet)bymeasuring,calcu-

latingorobtainingitfromtheblueprints(seeFigure2).

INCHRISEPER

FOOT RUN

RISEX12

RUN

RAFTER

LENGTH

RUN

+RISE

USETABLES

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 66 67

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Johnson-level-tool-mfg RAS-1 Manuale Utente Pagina 10