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Jessica Tile Floors June 12th, 2018 - 18:49:53
Prepare the Sub-Floor for the Tiling Process. After you are ready with your tools and before you begin tile flooring installation. you must first prepare the sub-floor for the ceramic tile flooring installation. This involves cleaning the sub-floor thoroughly and checking it for cracks. If you do find cracks. you must repair them. If any crack is too large to repair. that section of the floor must be replaced completely. If your floors are wooden make sure that they are supported well and are at least two inches thick so that they are able to withstand the weight of the tiles you are about to install on them. Once you have checked for cracks and cleaned all the debris off the sub-floor you are ready to begin with your ceramic tile flooring installation.
What floor covering was on the floor before? If it had ceramic tile or stone. and the floor received reasonable traffic for years with no cracking or broken grout. it`s a pretty good bet that the subfloor is up to the job. If it was vinyl. carpet or hardwood. we are still in the dark.
There are formulas used in the industry to determine if the subfloor has excessive `deflection` [bounciness. lack of rigidity]. The most cited one is the Tile Council of North America standard for deflection. which is stated as L/360 as a minimum. before tile underlayment is installed. L/360 means that the floor should not bend under weight more than the length (expressed in inches) of the unsupported span divided by 360. For example. if the span between supports runs for 20 feet then the deflection should not be more than 2/3" between the center and the end. L=20 x 12" = 240". L/360 = 240"/360 or 2/3". So 2/3" is the maximum amount of movement the center of the span should be allowed to move.
If a subfloor displays excessive deflection. it can usually be remedied by installing more plywood on top of it before tile is laid. and by reinforcing the joists from below. While it may make the floor higher than before. think of it as a sort of `insurance policy` against flooring failure.