Figure 6-25.-Rafter terms.
The structural relationship between the rafters and
the wall is the same in all types of roofs. The
rafters are NOT framed into the plate, but
simply nailed to it. Some are cut to fit the plate.
In hasty construction, rafters are merely laid on
top of the plate and nailed in place. Rafters may
extend a short distance beyond the wall to form
the eaves and protect the sides of the building.
Figure 6-25 shows a typical roof framing plan.
The following rafter terms and definitions
supplement the notes in the drawing:
COMMON RAFTERSRafters that extend
from the plates to the ridgeboard at right angles
HIP RAFTERSRafters that extend diago-
nally from the corners formed by perpendicular
plates to the ridgeboard.
VALLEY RAFTERSRafters that extend
from the plates to the ridgeboard along the lines
where two roofs intersect.
HIP JACKSRafters whose lower ends rest
on the plate and whose upper ends rest against
the hip rafter.
VALLEY JACKSRafters whose lower ends
rest against the valley rafters and whose upper
ends rest against the ridgeboard.
CRIPPLE JACKSRafters that are nailed
between hip and valley rafters.
JACK RAFTERS-Hip jacks, valley jacks, or
TOP OR PLUMB CUTThe cut made at the
end of the rafter to be placed against the
Figure 6-26.-Additional terms used in rafter layout.