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Measure from the point on the blade to the point on the tongueit should be 14-7/16 inches (Gaf roofing). Multiply this by the run of the building. We're utilizing 10 feet in this example, excluding the overhang. The resulting figure is 144-1/2 inches. We include 12 inches for the overhang to get a final figure of 156-1/2 inches.

Analyze the rafter board to identify if there is any curve or "crown" in the board. You should make this first pattern rafter on the straightest board you can discover. If there is any curve in the board, lay out the rafter so the crown is up or dealing with away from you.

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( If the crown were to be placed down, the roof might ultimately sag.) 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 far from you.

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Mark along the backside of the tongue. This is the plumb cut for the roof ridge. Procedure form the top of this line down the board to figure out the line length, or length of the rafter, less the ridge board. This typically 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 in the past, mark down to the side of the tongue. This marks the plumb cut at the inside of your home wall for the notch (called a bird's mouth) to seat the rafter one the wall plate. Include the length of the overhang beyond this mark and mark it.



In the example shown 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. Figure out the wall density or depth of the bird's mouth cut and make a mark - commercial roofing companies. Cut the notch, first with a handsaw or portable circular saw, and then end up the cut with a handsaw.

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

You may wish to test these on the building prior to cutting the rest of the rafters. Once you're sure these 2 pattern rafters are properly 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 as well.

Make sure you carefully follow the pattern rafter. A variety of years ago I was constructing a two-story structure. One carpenter set out and started to cut the rafters. He ended up being ill from the extreme heat of the day and another carpenter took control of for the last third of the rafters.

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

It includes its own heavy-duty belt holder that is also designed to hold a carpenter's pencil and the instruction booklet. The brand-new C.H. Hanson Pivot Square makes it eady to set out rafters. this quality tool includes 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 attached to the pivoting arm. With the typical rise figures facing you, and the raised fence on the right, the bottom represents the base of the triangle (the run) and the best side the elevation (the rise). The long adjustable edge represents the hypotenuse of the triangle, or the line length.

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Merely change the square to the preferred pitch and lock in location with the knurled knob. You can then use the square to transfer the angle for the cut to the lumber. Or you can hold the square in location and use it as a strong guide for running a portable circular saw.

Identify the pitch, then you can set a miter saw or substance miter saw to make cuts in degrees that adhere to the preferred pitch. The Pivot Square can likewise be used to lay out pitches steeper than 12/12, along with to lay out hip-valley rafters. These figures are identified on the back side of the square.

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