![]() Rafter Tools Copyright © 2013 Rafter Tools. Online- UnEqual Sided Octagon Geometric & Trigonometric Roof Framing Development Online- Equal Sided Octagon Geometric & Trigonometric Roof Framing Development Pages from the book Holy Grail of Roof Framing Trigonometry and Geometry Free UK Span Tables for Rafters to BS 5268-7.5 - Timber Beam Calculator All span tables Floor joists Ceiling joists Flat roof joists Rafters Purlin Span tables Rafters Span Tables for Rafters (to BS 5268-7.5) Imposed loads of 0. Octagon 4 Butt Hip Rafter with Purlin Structural Ring.Supported Octagon Roof Framing Dimensions This calculator will also calculate the King Post Radius,the King Post Rise, the King Post Minimum Height and the The Hip Rafter Pitch is the common rafter pitch over 13 in, like 8in/13in for an 8in/12in roof pitch. ![]() The Hip Rafter Angle is not the same as a 90° plan angle. The Roof Eave Angle will always be 135.00° for an equal sided octagon. The rafters that butt into the purlin blocks will have a square cut instead of a plumb cut. Th purlin blocks are installed perpendicular to the roof surface (90°). The calculator will return the miter angle and saw blade bevel angle for the purlin blocks. The purlin structural ring blocks can be installed to make the rafter connectionsĪt the peak of the Octagon Roof less crowded. Not really used at this time.Įnter the rafter material depth that will be used to determine the HAP of the rafters.Įnter a rafter seatcut length that will be used to determine the height of the heel cut (HAP).Įnter a radius for the purlin structural ring blocks. This menu option allows you to set the depth of the rafters that is used to calculate:Įnter the rafter material width that will be used for the roof. If we assume a run of 2.4m (a), and a rise of 2m (b), then using a calculator we get: 2.4² + 2² 9.76 Then simply find the square root of your answer: 9.76 3.12 This means your final rafter length 3.12m. Hip Rafter Material Depth, Main Material Depth The width of the hip rafter is used to calculate the size of the king post. This menu option allows you to set the width of the hip rafter. The main hip rafter and the valley rafter jack rafters. The calculator will retun the jack rafter length difference for For calculations based on the roof pitch: The formula used to calculate rafter length from roof pitch is, in fact, the same as the one above. This menu option allows you to set the jack rafter On Center spacing of the jack rafters. The rafter overhang run will be used to calculate the common rafter overhang length. This menu option allows you to set the rafter overhang run. This menu option allows you to set the length for calculating the angles and dimensions of the
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