Step 6Glue and screw
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This is when you are going to need the pipe clamps to hold this mess together. Flip the tileboard over and slide on the long side frame pieces, fat side up. Take one of the short frame and apply glue on each end, and slide it on, fat side up. Then square up the corner, and put a pipe clamp on that end. Repeat on the other end. You may need to use a rubber mallet to make sure everything is even. When you are happy, drive home the pocket screws. Leave the whole thing in the clamps for at least an hour to drive.