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For maximum stability, install two(2) layers of 18mm Ply on joists at centres no more than 450mm apart. The sheets are to be glued and screwed. This is the American system for "structural timber flooring" In NZ we will acept single layer ply for internal domestic work, then use a 2-pack...

You should have no problems with a flexible adhesive in this case, provided that you have left room for expansion at the perimeters, in both the adhesive and the levelling compound. DO NOT grout the perimeter joints, use a deformable mastic (silicone, urethane) or leave open under the skirting...