Smallwood Roofing Square Instructions

How to use a framing square and its etched on tables to figure out roof slope rafter lengths.

Smallwood roofing square instructions.

Rebuilding america one square at a time. This article explains how to make quick use of a framing square and its imprinted data to get some basic roof measurement data like roof pitch or slope rafter lengths and end cuts. Purlin housing angle on the side of hip or valley use the value on line 6 by moving the decimal point one place to the right. As a miter square for accurately marking 45 angles and.

Look on the first line of the roofing square to determine the length of common rafters per foot run. As a protractor for easily finding and marking various common angles especially roof rafter pitches and angles for stair stringers the vertical supports on a stairway. Swanson was a carpenter in a small town outside of chicago. A carpenter s framing square includes some tables stamped right into the tool itself.

The speed square was invented in 1925 by albert swanson. Rafters made by 2 x 4 s lay a carpenter square body flush with top edge of the rafter and marking the bottom edge of the square body. In our example using a 25 common pitch use 2 708 mm on the tongue of the square and 10 on the body. If the span in this example is 9 75 m 32 feet multiply 35 28 cm 13 89 inches by 4 8 m 16 feet and you get 565 cm 222 24 inches or a rafter length or 5 65 m 18 52 feet.