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Blueheron.. The floor is pretty level when I pull a string and measure up the sides. It is pretty close, may be alittle off. You will never notice once everthing is put back together.
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Stringlines around the perimeter won't tell you if you have a twist. Imagine a twisted picture frame. All four sides can be straight, but it's still twisted. To be sure, try this trick of the trade from an old carpenter:
Run two stringlines diagonally across the deck as in the picture below. Pull the red one first, then pull the blue one over the top of the red one. Pull both strings tight and then slide a 2x4 block under each end of each string. The strings should touch in the middle. If there's a space between the strings, you have a twist. If there's no space, switch the strings so the red one runs over the blue one. If they touch again, you're good to go.
Dave
