![]() 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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