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Note: Standard SF and DF pole preparations are located 3/4 of the height. of the pole from the base, except on 20' poles. Maximum height. for SF and DF pole preparations on 20' poles is 13' from the base. Projection. 20'-39'.
It is a flat, single piece of aluminum or steel that consists of 2 armsâa larger arm, 24 inches long, called the blade set at 90 degrees to a shorter, narrower arm called the tongue. The framing square has ruled edges used for measuring with a level of accuracy up to 1/32 inch. It also has a diagonal scale, a board foot scale and an octagonal scale. Most framing squares have rafter tables inscribed on the face that give rafter information for various roof pitches.