Jack rafter | Article about jack rafter by The Free Dictionary
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jack rafter[′jak ‚raf·tər]
A short, secondary, or simulated rafter.
Any rafter shorter than the full length of the sloping roof, such as one beginning or ending at a hip or valley. See also: Rafter
Any rafter that is shorter than the usual length of the rafters used in the same building; esp. occurs in hip roofs.
References in periodicals archive
To mark the common and jack rafters
, clamp a 2x4 precisely above the spot where it will be installed (Photo 17).
Then measure, cut and nail the valley jack rafters
every 24 in.
Photo 14 shows you how to set the jack rafters
. When you fasten the lower end to the plywood, drive the screw in at an angle so the tip doesn't poke through the ceiling inside.
7 CUT the compound angles for the hip and jack rafters
. Remember that opposite hips and jacks are mirror images of each other.