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I present to you 4 foolproof rules that will make your roof perfectly straight, even if you only have crooked wood at your disposal. --- Receive a free training here: https://akademiaciesielstwa.pl/3video/ - you will learn how to calculate a hipped roof (without trigonometry) and how to trace regular and corner rafters - and all this at the bottom! --- Academy of Carpentry, Michał Sadko.