Tangent of an angle is defined as the ratio of the length of the right triangle's side adjacent to the angle (a) to the length of the side opposite the angle (b). Here is a summary of how we use the TAN or tangent function to calculate the length of a rafter when all we know is the roof slope and the roof total rise. If the vertical change in height is 4 feet 9 inches as indicated, how long must the rafter be? - 2 Moderator reply: The angle of elevation of a roof top is 32°. How to Calculate Roof Rafter Length from Slope & Rise Question: if my roof slope is 32° and the rise is 4' 9", how long will the rafter be We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Page top sketch of various roof slopes is provided courtesy of Carson Dunlop Associates (found at page bottom, Click to Show or Hide), Toronto. This article series gives every possible way to figure out any or all roof dimensions and measurements expressing the roof area, width, length, slope, rise, run, and unit rise in inches per foot. These same calculations used for roof rafter length will let you compute the length of roof trusses or the length of ramp or stair support stringers. Roof total rise (at the ridge), roof horizontal run distance, rafter length, or roof slope in rise/run or slope or percent slope or even a tangent value. Roof rafter length or calculation is easy if we know any tworoof measurement numbers chosen from: We have no relationship with advertisers, products, or services discussed at this website. Number and Length of Rafter and Collar ties - Computes the number and length of rafter ties and collar ties based on roof dimensions and spacing.InspectAPedia tolerates no conflicts of interest.Number and Length of Rafters - Computes the number and length of rafter boards based on roof dimensions and spacing.Number and Length of Purlins for a Roof - Computes the number of purlins for a roof based on dimensions and spacing.Screws for a Metal Roof - Computes the number of screws needed for a metal roof.Number and Length of Metal Roof Panels - Computes the length and number of metal panels and trim pieces for a metal roof.Roofing nails needed for a roof - Calculates the number of roofing nails needed for a roof in normal and high wind conditions.Shingles needed for a roof - Calculates the number of standard bundles (33.3 ft 2) of shingles for a roof.4x8s needed for a roof - Calculates the number of 4x8 sheets needed to cover a roof.Number of Trusses Needed for a Roof - number of trusses needed based on the roof width and the truss spacing.26.6 o : 6/12) based on the length of the rise and run. Pitch of a Roof - Computes angle of incline in the roof in both degrees and rise over 12" run (e.g.It also returns the number of 4x8 sheets to cover the roof, the number of standard bundles of shingles to cover, and the number of roofing nails for both normal and high wind environments. Area of a Roof - Computes the area of a roof based on the pitch and the dimensions of the area covered by the roof.Metal for a Roof - Calculates the number of metal panels for a roof.This algorithm puts the collar tie two feet below the ridge, but only if the ridge is 48" above the rafter ties. The collar tie length is a function of the pitch of the roof and the position of the collar tie. Note: some builder use a collar tie on every other rafter. Collar ties are suggested for roofs with a rise greater than forty eight inches (48"). Rafter ties or Ceiling Joists keep the rafter boards from kicking out under the downward load on the roof. Collar ties are included when the total rise is above 48".Consult your local codes for the required material specifications. The choice of rafter boards is 2x4 for rafters shorter than six feet (6'), 2圆s for rafters between 6 feet and 10 feet, and 2x8s for up to 16 foot long rafters.The length of the Ridge is the length of the ridge plate.The rules in this calculator are as follows: In all cases, confirm your estimates with a professional estimate and adhering to local building codes. The Roof Rafter calculator is meant to help with material estimates. Rafter Boards (RB): The calculator computes the following rafter framing materials: ( oC) On-center rafter spacing (default: 24").INSTRUCTIONS: Choose units and enter the following: It also returns the length of the ridge board, and the length and number of rafter ties and collar ties. The Roof Rafter Count calculator computes the total number of rafter boards (roof joists) for a gabled roof based on the ridge length, pitch and span.
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