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Get 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! How to calculate the length of the ridge beam? How to make even the most crooked corner rafters straighten themselves? In this video, I show how to accurately (after installing the wall plate, intermediate purlin and corner rafters) install the ridge beam and find out its length thanks to simple calculations. I show why, with crooked corner rafters, the method of measuring the distance from lock to lock will not be the best solution and consequently makes the roof crooked. When calculating, I take into account values such as: the length of the wall plate (from which the length of the ridge results) and the lock indentation. Academy of Carpentry, Michał Sadko