## What angle do I cut for a 4 12 pitch?

approximately 18.4 degrees
What angle is a 4 over 12 pitch? Roofs with a pitch of 4/12 are approximately 18.4 degrees, depending on how exact you’d like to be in your measurement.

## Is a rafter square the same as a speed square?

A speed square, also called a rafter square, rafter angle square, and triangle square, is a multi-purpose triangular carpenters’ tool use for marking out. Its functions include many of those of a combination square, try square, and framing square.

## What size rafter square do I need?

A: According to experts, the best size will be a 12-inch speed square. The reason behind this is its versatility and durability. It will provide you 45 and 90-degree angles. It can also be used as a ruler and help in measuring angles precisely without any mistake.

## How do you use a 45 degree angle with a speed square?

Cutting crown moldings in your front room or a frame for your gallery wall becomes a breeze with a speed square! Simply brace the lipped side of the speed square against the edge of your board, pencil a line up the hypotenuse of the speed square, andâ€”voilÃ ! You have a perfect 45-degree angle for easy corners.

## How do you use a speed square tool?

Find Roof Pitch
1. Place the pivot point against the shingles.
2. Then place a torpedo level on the fat base of the speed square.
3. Adjust the square until the level is level.
4. Read the pitch on the side of the speed square. Note: The pitch tells you the amount of vertical rise (in inches) for every 12 inches of run.

## Do you need a Birdsmouth on a rafter?

Structurally, a rafter sitting on an angular bearing point (the inclined plane of the ripped strip) would require that the rafter-plate connection deal with the horizontal and vertical components of the force differently than with a birdsmouth.