How To Build A Roof

Published Oct 20, 20
5 min read

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Step from the point on the blade to the point on the tongueit must be 14-7/16 inches (EPDM roofing). Multiply this by the run of the building. We're utilizing 10 feet in this example, leaving out 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.

Examine the rafter board to identify if there is any curve or "crown" in the board. You need to make this very first pattern rafter on the straightest board you can find. 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 roofing system might eventually droop.) Then lay out the rafter as revealed on the next page. This example is for a roofing system with an 8/12 pitchPosition the square at the end of the rafter board, with the tongue on your left and dealing with far from you.

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Mark along the backside of the tongue. This is the plumb cut for the roofing ridge. Step form the top of this line down the board to identify 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 same position as in the past, discount to the side of the tongue. This marks the plumb cut at the within the home 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. Figure out the wall density 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 end up the cut with a handsaw.

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

You might wish to test these on the structure prior to cutting the remainder of the rafters. Once you're sure these 2 pattern rafters are properly cut, mark them as patterns and mark and cut the necessary number of rafters. If the building has hanging or "fly" rafters for the gable ends, cut them as well.

Ensure you thoroughly follow the pattern rafter. A number of years ago I was constructing a two-story building. One carpenter set out and started to cut the rafters. He became ill from the extreme 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 2nd carpenter didn't use the pattern rafter, or merely wasn't as exact, however it was an expensive error. The new C.H. Hanson Pivot Square makes the task of setting out a roofing rather simple. I wish I had this tool a variety of years and structures earlier.

It features its own durable belt holder that is likewise developed to hold a carpenter's pencil and the guideline brochure. The brand-new C.H. Hanson Pivot Square makes it eady to set out rafters. this quality tool comes with 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 pivoting arm. With the common increase figures facing you, and the raised fence on the right, the bottom represents the base of the triangle (the run) and the ideal side the elevation (the increase). The long adjustable edge represents the hypotenuse of the triangle, or the line length.

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Simply adjust the square to the desired pitch and lock in place with the knurled knob. You can then utilize the square to transfer the angle for the cut to the lumber. Or you can hold the square in place and use it as a durable guide for running a portable circular saw.

Figure out the pitch, then you can set a miter saw or compound miter saw to make cuts in degrees that adhere to the preferred pitch. The Pivot Square can also be utilized to lay out pitches steeper than 12/12, as well as to set out hip-valley rafters. These figures are determined on the back side of the square.

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