Be a Post Master, Installing Deck and Fencing Posts
It's hip to be square
At one corner of your planned structure, measure from the corner to a point 3' away on one string, and mark the spot on a piece of masking tape folded over the string. Then, measure the perpendicular string 4' out from the corner, and mark that point. Now, measure between your two marks. If the distance equals 5', the strings lie at right angles to one another. If the distance is less than or greater than 5', relocate the string on your batterboard until it's right on the money. Mark the correct spot on the board with a nail, or a handsaw kerf, in case the string gets moved by accident. Check the adjacent corners for square, and finish up at the opposite corner.
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