Measure Roof Pitch Framing Square

At roof measure by folding rule obtain roof pitch or slope by using the rafter tables on a framing square a long standing use of the framing square that is missed by many new carpenters is the rafter table imprinted right on the framing square itself.

Measure roof pitch framing square.

Align the pivot point with the outer edge of the roof where it meets the side of the structure making sure the fence is facing up. The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters. Because of its compact size it is frequently used as a saw guide when cutting framing members as well as a layout tool for quick 45 and 90 degree cuts. Number on framing square 228 204 x 12in.

The trick here is understanding the number on the framing square is the unit rise per foot of run. Determine roof pitch fast using a carpenter square and torpedo level. 13 412 is the unit rise in inches per foot of our example roof run. 204 x number on framing square 228.

This is the shorter and more narrow arm of the l normally 1 1 2 in width and 16 long. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Hold a torpedo level flat against the lip of the fence and adjust the height of the square until the bubble inside the level is centered. The fatter and longer length of the framing square is its blade.

The framing square tongue. The framing square blade or body. To use the rafter length tables on the framing square blade front you need first to understand the type of rafter you are cutting. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

228 204 x 12 13 412. For a common rafter or for each of the other rafter types these tables give the length of the rafter per foot of horizontal run. It is often compared to slope but is not exactly the same. This data will tell us the required rafter length for a roof of a given pitch or slope.