Graphical Construction Glossary >> Roofs and roofing. >> jack rafter

jack rafter

A rafter that follows the same line as the common rafters, but it meets a hip instead of the ridge board. As a result it is shorter than the common rafters and has an inclined top or cheek cut where it meets the hip rafter.

A sketch of a hip roof.

In the sketch above the jacks are shown in red.

a typical j-rafter.

These rafters share the same side cut as all the other rafters, (provided that the roof is standard) but they have a top or cheek cut to fit neatly to the side of the hip.

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"What can be added to the happiness of a man who is in health, out of debt, and has a clear conscience?
Adam Smith 1723-1790

"When we build, let us think that we build for ever."John Ruskin 1819-1900