The Framing Square Is One Of The Basic Tools In A Carpenters Tool Box.

It's a large square and is great for laying out square lines, but using it for angles can be a bit more intimidating until you discover how.

Lets start with the two basic cuts for a roof rafter. The plumb cut at the ridge and the seat cut at the top of the wall. These cuts are easy to lay out providing you know the slope on the roof.

Here's how: