Rafter squares are in the shape of an isosceles right-angled triangle with a T-edge on one leg.
SOLA’s rafter square combines the functions of a ruler, try square, miter square, angle meter, scribing notches, saw guide, and rafter measurer. The rafter square in the shape of a right-angled triangle has a robust T-edge on one leg for precise 90° and 45° markings. The T-edge can also be used as a sawing aid or saw guide.
A special function of the rafter square, which is primarily used in the Americas, is the cutting of rafters. For this purpose, the rafter square from SOLA has a separate scale for common rafters, hip rafters, and valley rafters.The lower COMMON scale can be used to saw common rafters for a roof to size. The common rafters are the rafters that run from the ridge straight downwards. The scale is based on the rise of the rafter, which is specified in decimeters per meter. A conversion table can be found on the reverse of the SOLA rafter square.

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