One of the challenges when creating
corners is getting them square. While no room is ever PERFECTLY
square, we need to get the corners as close to 90 degrees as possible.
If not, any tile or carpet laid will be noticeably 'off' from
one side of the room to the other. Using the 345 method for
squaring corners, and a framing square will help ensure your corners
are square.

To create corners, we use the
345 rule derived from the Pythagorean theorem of basic
geometry: A^{2} + B^{2} = C^{2}. This means the square of the hypotenuse
of a right triangle is equal to the sum of the square of
both legs.


Getting away from the geeky math stuff, it simply means that
if you measure 3' out from the corner in one direction, and 4'
out in the other direction, the line between the two points should
be 5'. If not, your corner isn't square.
You may not think this is a big deal (since
most rooms aren't perfectly square anyway). However, over
the course of 1520 feet, it would make a noticeable difference.
If you're tiling the floor, or using a covering (carpet,
linoleum, etc.) with a pattern, it will be very noticeable
if your corner isn't straight!




