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The corner is then braced with diagonals across the back of the two flats. The braces and walers make it important to set the toggles on both flats at the same height. The rule for overlaps is that they cover the intended edge and there is a gap between the frames or piece for adjustment. A flat may have a wider or narrower overlap or overlaps on more than one side. A double overlap is common on the underside of a bulkhead or box beam. Wider overlaps are common on flats that need to be scribed into another set piece or into an existing location. Calculating frames & skin-allow 3″ for an O/L - 4′ x 10′ single overlap flat – 1x3 frame - 3′-9″ x 10′ - luan skin- 4′ x 10′ Skin is the full size of the flat. Frame is made 3″ narrower so the skin protrudes over/beyond one side. The overlap is matched up with a standard flat set at right angles to it. 
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