The last thing that needs to be done before you order the concrete for your building foundation is to check the square of the forms. No matter if you carefully laid out survey stakes and string to try and keep it all in place, the lines of your building foundation are most likely out of square. Bringing your forms back into square is not a complicated process, but it can be time consuming.
Measure the length of each side of your foundation from the outside of the wall to the outside of the wall on the opposite end. Your opposite sides should be equal. If they are not, measure and identify what forms or spacers need to be added or removed to make the sides identical.
Measure from one corner to the corner diagonally opposite. Then repeat this on the other set of opposite corners. These two measurements should be the same for your building foundation to be considered in square. If they do not match, go onto the next step.
Move the corner that has the shorter measurement. Do this one of two ways. One, jam the bottom of your Johnson bar into the bottom of the corner form and pry up quickly to shove the corner toward its opposite end. Take another measurement and see how much more it needs to move. If you have a long foundation wall formed, go down the wall and every 15 feet wedge the Johnson bar against the locking T bar that joins the individual forms and push the forms forward. Check the measurements (both diagonals) and keep adjusting the form with the bar until the measurements match.