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Still not clear. Are you raising the entire room's floor by 2 feet? Or do you just need the aisles raised 2 feet? If you need the entire floor, you should consider building a 2x4 supporting wall around the perimeter 1'-4" above the existing floor. On top of that lay 2x8 joists at 16" on center and some 3/4" decking. You will then have, in effect, a new floor, independant of the lower one, and just as strong. Since you are building a new structural floor, check you building codes for blocking required. The IBC requires the blocking mentioned above for joists 2x10 or larger. <br /> <br />If all you need is a raised platform within the aisles, then build a 2x4 or 2x3 kneewall along your benchwork 1'-6" high and lay 2x6 joists across the short distance. No blocking is necessary. Use 1/2" plywood for decking. This is more than sufficient for a short span of 3 or 4 feet unless you plan to park your piano or your railroads file cabinets on it. <br /> <br />Wayne
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