Jack Rafter

The Jack Rafter Mobile App has been developed to enable both the casual and professional carpenter to work out the following calculations when assembling traditional roof trusses. The App's Calculator lets you work out: Rafter Lengths. Hip/Valley Length. Rise. Jack Rafter Reductions. Rafter Plumb Cut. Rafter Seat Cut. Hip/Valley Plumb Cut & Seat Cut. Hip Backing Bevel.