jack rafter


Also found in: Dictionary, Wikipedia.
Related to jack rafter: Valley rafter

jack rafter

[′jak ‚raf·tər]
(building construction)
A short, secondary, or simulated rafter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

jack 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
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

jack rafter

jack rafter
Any rafter that is shorter than the usual length of the rafters used in the same building; esp. occurs in hip roofs.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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.