![]() ![]() Setting out Rafter Lengths with a Ready Reckoner You don't need a framing square or rafters to calculate the rafter lengths, you can do it all on paper allowing you to calculate all the materials needed to price the job accurately just by knowing the size of the roof and the centres for the rafters. It is also handy when quoting a price for a roof that you haven't been supplied a technical drawing for. Once you've measured the run of a rafter, simply look up the right table in the ready reckoner for your roof pitch angle and using the measurements relevant to the span of the wall plates it tells you everything from all the common rafter lengths, plumb and seat angles to the length of the hips, the jack rafter cuts and several others are covered too. This saves a ton of time and trips up/down the ladder. I use it with an adjustable stanley quick square and can cut the whole roof on the ground, take all the timbers up and assemble the lot in one go. No sh#t, it has probably paid for itself a hundred times over.Īll the complicated trigonometry calculations are done for you, and there's loads more in there too, like diminishing jack measurements and hip rafter lengths and angles as well. I bought a copy of Goss's Roofing Ready Reckoner that a friend recommended for around £20. There are a few good ready reckoners available. Each page has a different table depending on the pitch (angle) of your roof with all the figures you need A ready reckoner is pretty much a 'rafter length calculator' - a book full of tables for working out the rafter lengths quickly and easily.
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