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Subfloor Preparation
4. Existing Subfloors - must be sound with nails holes filled in, surface must be smooth and level, sanding may be necessary. Badly warped or springy floors must be reinforced by covering with a minimum of 1/2" exterior grade plywood or other recommended subfloor material.
5. Painted Concrete Subfloors - all paint, oil, grease and wax must be completely removed prior to applying an underlayment compound or installing tile.
6. Existing Tile on Concrete - old flooring must be smooth (not embossed or cushioned) and firmly bonded to the floor. All traces or wax or floor finish must be entirely removed from the surface to be covered. This should be done by a through scrubbing using a wax remover together with an abrasive scouring powder. Damaged areas must be replaced or repaired. Damp mop and allow to dry. A latex skim coat will help to act as a moisture barrier.
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