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As with all rigid tiles a firm sub-floor is needed for the laying of a natural stone floor. An even and level sand and cement screed is the ideal surface, but suspended wooden floors need not be a problem as long as they are strengthened. Normally waterproof plywood screwed down to existing floorboards at 200mm centres is enough, but if in doubt it is best to get professional advice. If levels are problem, plywood can be screwed straight to joists ( if the joints between the sheets are supported by noggins at 250mm intervals ) happy feet flooring reviews
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