So it is suited for use when you’re in the office, at college or on site. This tool handles common rafters, lean tos, hip roofs. This calculator will work on desktop, tablet and mobile devices be they iPhone or Android. Rafters are the sloping beams that support the load of the roof. The RoofJacker Ready Reckoner (v1.484) on this page is designed to be a responsive web app. With just three measurements, you will be able to use this online Ready Reckoner and calculate the following roofing dimensions Rise per metre Run, Rafter Length, Hip Length, Jacks Diminish, Common Rafter Seat Bevel, Common Rafter Ridge Bevel, Hip or Valley Seat, Hip or Valley Ridge, Jack Rafter Edge and Purlin Edge. If you deduct the thickness of the ridge board when you calculate the common rafter length then the hip length given by the calculator will be correct with. These are used to calculate the various angles and measurements required when building a roof. This roofing calculator will work on any device with web access and is designed to replace the unwieldy hard copy look-up tables that are also known as the Roofing Carpenter’s Ready Reckoners. This online Roofing Ready Reckoner app, is a custom coded trigonometrical calculator. This in turn became a single page web app, which allows you to enter just 3 measurements and calculate all the dimensions you need to construct a roof. Working together with my son in March 2011, the result was a spreadsheet that he soon coded into HTML. I felt that it was surely time for a change, from the old and outdated ready reckoner table. While teaching at my local technical college, I realised that the popular book of Roofing Ready Reckoner look-up tables had been in use for decades. Online web app for calculating roofing dimensions
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