It is common practice to install rafters with the ends running long, then cut them later. If you plan to have an overhang on your rafter tails, the rafter length will be longer. It is the length of a line beginning at the inside of the Birdsmouth drawn parallel to the edge of the rafter. Note that this is not the actual end-to-end length of the rafter. Rafter Length - The rafter length result from this calculator represents the Line Length of the Rafter(L). The angle information is valuable when performing roof framing tasks using tools that are not roof-pitch calibrated, such as the Bevel on a circular saw, which is degrees calibrated. All the figures are based on roofing tiles or slates laid. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. ![]() The roof pitch calibrations on a Speed Square are also used for quickly marking the pitch cut angles on the head and tail ends of rafters.Īngle - Angle(A) is the roof's Pitch(X) represented in degrees. Subject PURLIN AND RAFTER ROOFS Timber sizes and construction Guidance Note details. If you know a roof's Pitch(X), you can use the information to lay out rafters with a Framing Square. Pitch/Slope - Pitch and slope, often used interchangeably on the job site, refer to a roof's Pitch(X) represented as X in 12, where X is the number of inches of vertical rise for every 12 inches of horizontal run. Roof Pitch Calculator Results (Explained) Remember to allow for Ridge Thickness in Rafter Run to Outer Wall. Use SHIFT + or Cursor Keys to scale Birds-mouth. The roof pitch chart is a visual representation of the actual slope of a roof, given the roof's Pitch(X)/Angle(A). Rafter calculator angle dimension diagram. Select this option if you know the rafter's Rise(M) and the roof's Pitch(X) and need to determine the Run(R) of the rafter. Run(R) - This option places the Rise(M) and Pitch(X) fields into the Input section and moves the Run(R) to the Results section. Select this option if you know the rafter's Run(R) and the roof's Pitch(X) and need to determine the Rise(M) of the rafter. Rise(M) - This option places the Run(R) and Pitch(X) fields into the Input section of the calculator and moves the Rise(M) field to the Results section. The Pitch(X/12) represents the number of inches of Rise(M) for every 12 inches of Run(R). ![]() Pitch(X) - This option (the default) places the Rise and Run fields into the Input section. These span tables are the equivalent of other industry-standard span tables and are calculated to the same standards. These spans were calculated using our flat roof joist calculation engine. This span table is to the format and methodology given in BS 5268-7.2. The Roof Pitch Calculator Input Options (Explained) Click on a span to generate a full calculation (you can adjust the exact span). To determine the ( Y) height, measure from the inside of the Birdsmouth up the calculated Pitch (X in 12) to the top of the rafter. To determine the finished height of the Ridge Beam, add the Rise ( M) and the ( Y) height.
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