Prep: Floor Preparation Instructions

Floor Preparation Instructions

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1) SUBFLOOR
- Minimum of 5/8" subfloor must be CLEAN, SMOOTH, DRY, HARD, FLAT and STRUCTURALLY SOUND. Subfloor must also meet JOINT SPECIFICATIONS, TOLERANCE (FLATNESS) SPECIFICATIONS, and DELFECTION SPECIFICATIONS according to the Tile Council of North America (TCNA) guidelines.

2) JOIST SPECIFICATIONS
- 16" OC (on center)

PDF Instructions:


3) TOLERANCE SPECIFICATIONS
- Subfloor for tiles less than 15" in length must be within a tolerance of ¼" in 10' and 1/16" in 1' as defined by the TNCA Handbook for Ceramic Tile Installation. For tiles with at least one edge 15" or greater in length, maximum allowable variation is 1/8" in 10' from the required plane, with no more than 1/16" variation is 24" when measured from the high points in the surface. Identify high and low spots that are out of tolerance by laying a 6'-8' straight edge across your subfloor. High spots should be removed by planing, sanding or grinding. Low spots should be filled. When leveling the subfloor, use only portland-based fillers; never use gypsum-based fillers as they will support mold growth.

4) DEFLECTION SPECIFICATIONS
- The sub floor must not have deflection greater than 1/360 of the span when measured under a 300 lb concentrated load (See ASTM C 627). Inspect floor for movement. If movement is caused by loose boards, support them. If movement is caused by deflection or structural movement, consult a carpenter for structural repair.

5) MEASURE THE AREA
- Measure the area to be tiled and estimate the square footage needed, plus 10% for cut-waste and possible future repairs.

6) REMOVE MOULDINGS
- Remove any existing carpeting, padding, base and/or quarter round mouldings. DO NOT remove existing resilient floor covering as it may contain asbestos. Please refer to the Resilient Floor Covering Institute (RFCI) publication Recommended Work Practices for removal of resilient floor coverings.

7) CHECK ALL CLEARANCES
- Check all door and appliance clearances, as well as transition heights. Cut or plane the bottom of doors to accommodate the change in floor height.

8) UNDERCUT DOOR CASINGS AND JAMBS
- Undercut door casings and jambs. This will allow tiles to move freely while also covering the cut edges. A scrap piece of tile can be used to guide the saw blade. This will help achieve the correct height for undercutting.



PLEASE NOTE: Finish, texture, shade, color, pattern and sheen variations are normal in glazed porcelain tile and can vary between production lots. For best results, please ensure all tile for your project has been produced from the same lot. Lot numbers are indicated by the barcode on each box of tile.

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