Building A Porch Roof

Published Nov 14, 20
5 min read

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Measure from the point on the blade to the point on the tongueit ought to be 14-7/16 inches (roll roofing). Multiply this by the run of the structure. We're using 10 feet in this example, leaving out the overhang. The resulting figure is 144-1/2 inches. We include 12 inches for the overhang to get a last figure of 156-1/2 inches.

Take a look at the rafter board to figure out 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 shown on the next page. This example is for a roofing 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 behind of the tongue. This is the plumb cut for the roofing ridge. Step 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 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 same position as in the past, discount to the side of the tongue. This marks the plumb cut at the within your 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 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. Determine the wall thickness or depth of the bird's mouth cut and make a mark - residential roofing contractors. Cut the notch, first with a handsaw or portable circular saw, and then 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 method of setting out rafters with a square is called "stepping off." Make a replicate rafter from the pattern. roof contractor. Then lay the rafters out on a smooth, flat surface, with a 2-by in between them at the ridge line.

You might want to check these on the structure prior to cutting the remainder of the rafters. When you make certain these 2 pattern rafters are correctly cut, mark them as patterns and mark and cut the essential 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 building 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 third of the rafters.

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I don't know if the 2nd carpenter didn't use the pattern rafter, or just wasn't as accurate, but it was a costly mistake. The brand-new C.H. Hanson Pivot Square makes the chore of setting out a roofing quite simple. I wish I had this tool a variety of years and buildings ago.

It comes with its own sturdy belt holder that is likewise created to hold a carpenter's pencil and the direction pamphlet. The 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 manual and a carpenter's pencil.

Degrees and rise are marked on a blade connected to the rotating 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 best side the elevation (the increase). 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 utilize the square to move the angle for the cut to the lumber. Or you can hold the square in location and utilize it as a strong 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 comply with the desired pitch. The Pivot Square can likewise be utilized to lay out pitches steeper than 12/12, in addition to to lay out hip-valley rafters. These figures are identified on the back side of the square.

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