Building Rafters - How To Cut Roof Rafters

Published Nov 13, 20
5 min read

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Procedure from the point on the blade to the point on the tongueit need to be 14-7/16 inches (cedar shake roof). Multiply this by the run of the structure. We're utilizing 10 feet in this example, excluding the overhang. The resulting figure is 144-1/2 inches. We add 12 inches for the overhang to get a last figure of 156-1/2 inches.

Analyze the rafter board to identify if there is any curve or "crown" in the board. You must make this very first pattern rafter on the straightest board you can discover. If there is any curve in the board, set out the rafter so the crown is up or facing far from you.

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( If the crown were to be placed down, the roofing system could ultimately droop.) Then set out the rafter as shown on the next page. This example is for a roof with an 8/12 pitchPosition the square at the end of the rafter board, with the tongue on your left and facing away from you.

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Mark along the backside of the tongue. This is the plumb cut for the roofing system ridge. Measure form the top of this line down the board to identify the line length, or length of the rafter, less the ridge board. This commonly is a 2-by or 1-1/2- inch board, so the measurement is less inches.

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Holding the square in the very same position as previously, discount to the side of the tongue. This marks the plumb cut at the inside of the house wall for the notch (called a bird's mouth) to seat the rafter one the wall plate. Add the length of the overhang beyond this mark and mark it.



In the example revealed this is 12 inches. Cut the rafter at the ridge line and at the overhang line. Then hold the square on the plumb line that marks the bird's mouth. Determine the wall thickness or depth of the bird's mouth cut and make a mark - metal roofing. Cut the notch, first with a handsaw or portable circular saw, and after that complete the cut with a handsaw.

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Continue moving down the rafter and marking plumb cuts, consisting of any odd figures. One approach of setting out rafters with a square is called "stepping off." Make a duplicate rafter from the pattern. cedar shake roof. Then lay the rafters out on a smooth, flat surface, with a 2-by between them at the ridge line.

You may want to evaluate these on the structure prior to cutting the rest of the rafters. When you make sure these two pattern rafters are correctly cut, mark them as patterns and mark and cut the required number of rafters. If the structure has hanging or "fly" rafters for the gable ends, cut them also.

Ensure you carefully follow the pattern rafter. A number of years ago I was constructing a two-story building. One carpenter set out and began to cut the rafters. He ended up being ill from the severe heat of the day and another carpenter took over for the last 3rd of the rafters.

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I do not know if the second carpenter didn't use the pattern rafter, or simply wasn't as accurate, however it was an expensive mistake. The new C.H. Hanson Pivot Square makes the task of setting out a roofing system rather easy. I want I had this tool a variety of years and structures ago.

It includes its own sturdy belt holder that is also developed to hold a carpenter's pencil and the instruction booklet. The new C.H. Hanson Pivot Square makes it eady to lay out rafters. this quality tool features its own belt pouch and has dividers for the square, an instruciton handbook and a carpenter's pencil.

Degrees and rise are marked on a blade connected to the rotating arm. With the typical increase figures facing you, and the raised fence on the right, the bottom represents the base of the triangle (the run) and the right side the altitude (the increase). The long adjustable edge represents the hypotenuse of the triangle, or the line length.

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Merely adjust the square to the wanted pitch and lock in location with the knurled knob. You can then utilize the square to move the angle for the cut to the lumber. Or you can hold the square in place and use it as a sturdy guide for running a portable circular saw.

Determine the pitch, then you can set a miter saw or compound miter saw to make cuts in degrees that adhere to the desired pitch. The Pivot Square can also be used to lay out pitches steeper than 12/12, along with to set out hip-valley rafters. These figures are figured out on the rear end of the square.

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Building Rafters - How To Cut Roof Rafters

Published Nov 13, 20
5 min read