How To Cut Jack Rafters

Also using pattern to measure. The first one is the bevel of jack rafter.

Porch On A Hip Roof House Hip Roof Roof Framing Roof Design

They can just be square-cut to the short-point measurement.

How to cut jack rafters. Take the pattern and mark one side of all the jacks to the long point of the plumbcut and then flip the pattern over and mark the other side of the jacks to the short point of the. Mark and step off the jack differences on the common pattern Long Point and Short Point. Choose which end of your rafter you want to be the top.

Some say to find the length of jack rafters you measure from the corner of the building where the hip is to the center of your layout mark for the jack and this is the run youd use to multiply by the unit rise on the framing square. Then use a pencil to trace the outside edge of the framing squares tongue. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators.

A jack rafter is a unique rafter because it is cut off before it can reach the full length from the plate to the ridge. Laying the square on the top of the rafter material I start by scribing the plumb cut at the peak of the rafter. Cutting Compound AnglesThe cuts made on hip jack and valley jack rafters are typically made at compound angles.

A jack rafter is a type of discontinued common rafter. I was taught to cut jack rafters by laying the amount of jacks on the bench half crowned one way and half crowned the other way. Set the framing square on top of the rafter beam with the tongue facing the top of the rafter.

If the pitches are different then the bevels will be different. Secure the stock so it will not move during the cut. The hangers used to mount the valley jacks to the valley rafter are skewable.

Using the skewable hanger eliminates the need to make an angle cut on the valley jacks. How to cut in a jack rafter using the ready reckoner book covering edge and plum cuts. Keep in mind that for most framing jobs the tongue the skinny side is the vertical cut and the body the wider side is the horizontal or seat cut.

The plumb or ridge cut is made at the top of the rafter. Grab the right tools for Cutting Roof Rafters to length Cutting roof rafters can be done as simply as with just a sharp hand saw and a bevel or two to save setting them up twice if thats all you have but it is both labour intensive and time consuming. Starting at the upper end of the rafter I mark 18 12-inch centers at 18 12 in 37 in 55 12 in and so onalong one edge of the pattern rafter shown on illustration above and in photo bottom right.

An unskewed one is lying flat on the floor beneath one I bent and tack-nailed to the side of the valley rafter. Then deduct half the diagonal thickness of the hip and this is the actual length to cut your stock. Then guide it across the rafter stock at a miter angle.

This is the angle in degrees to set the circular saw you should be using to cut the rafters. The side cut angle of a hip jack rafter always changes depending on the pitch of the roof eg 35 degree pitch roof side cut angle of 394 degrees 45 degree pitch roof side cut angle of 352 degrees Its the same with hip or valley side cuts 35 degree pitch roof hip side cut of 418 degrees 45 degree pitch roof hip side cut of 392 degrees. Using a common rafter I mark and cut the ridge birdsmouth and rafter tail to create my jack rafter pattern see illustration above.

To make such cuts tilt a portable saw at a bevel angle. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators. Jack rafters are very similar to common rafters since they share the same plane spacing pitch and length.

As long as the roof pitches are the same then the bevel will always be 45º. Mark the plumb cut at the top of the rafter.

Rafter Diagram Hip Roof Roof Construction Rafter