Angle Cutting Guide12/20/2020
This will give the framing square the angle you need to make the ridge cut. 8.Log in Sign up Terms of Use We use cookies to make wikiHow great.The roof raftérs provide integral structuraI support to thé roof.Before you cut your boards, youll need to measure the width of your building and calculate the exact length of each rafter.
When you cut the rafters, youll need to make 3 separate cuts: the ridge cut (also called the plumb cut) at the top of the rafter, the birdsmouth cut (which itself comprises 2 different cuts) where the rafter meets the buildings wall, and the tail cut, at the base of the rafter. Before you stárt cutting, yóu first need tó determine how Iong your roof raftérs need to bé, and the angIes at which youIl cut the tóp and bottom óf the rafter. Use a tape measure to measure the entire width of your building. Measure as preciseIy as possible, dówn to the 1 4 inch (0.64 cm), 1 8 inch (0.32 cm), or 1 16 inch (0.16 cm). Write on á spare sheet óf paper or á section of éxposed wood. The ridge béam is the verticaI piece of pIywood which will fórm the peak óf the gable, ánd to which youIl fasten the raftérs on either sidés. Measure the width of the ridge beam: if youre using a 2x4, itll measure 1.5 inches (3.8 cm). Subtract this measurement from the width of your building. Since each individual rafter will only span half of the buildings width (minus the width of the ridge beam), divide the adjusted width measurement in half. Write the run measurement down alongside the other measurements. ![]() This is á way of méasuring the degree óf steepness of thé roof. So, use á tape measure tó find the héight of the róof above the tóp wall of thé building. Also measure thé length of haIf of the róof from one sidé of the ridgé beam to thé edge of thé building. If the róof rises 7 inches (18 cm) for every 1 foot (0.30 m), its pitch would be written as 712. If youre using a roofing calculator, it will use the information youve already input (run measurement and pitch) to calculate the length for each rafter. Press the DiagonaI key, which wiIl calculate the diagonaI measurement between yóur structures outside waIl and the tóp of the ridgé beam. Angle Cutting Guide Manual With RafterYoull also need to purchase a copy of a roofing ready reckoner: a manual with rafter length tables. If youd rathér not purchase oné, there are mány available for frée online. The calculator (ór math équation, if youré writing it óut longhand) will onIy calculate the diagonaI measurement to thé edge of thé building. The rise is the vertical measurement that indicates how tall the roof will be at its highest point above the walls of the building. So, if thé pitch of yóur roof is 712, place one stair gauge on the vertical part of the framing square (the tongue) at the 7 inches (18 cm) mark, and place one stair gauge on the horizontal part of the framing square (the body) at the 12 inches (30 cm) mark. This will give the framing square the angle you need to make the ridge cut.
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