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ggpk Tile Floors July 09th, 2018 - 18:15:24
For plywood subfloors. be sure that the wood is at least 1 and 1/8 inches thick and is supported by an equally strong underlayment. Otherwise. your ceramic tiles will dislodge easily. or worse. break and need replacing. Concrete floors are the most ideal subfloor surface to work with. But before you can start installing ceramic tile flooring over it. it must be cleaned thoroughly. For dust and other debris. sweep and then mop your concrete subfloor surface. and allow it to dry completely. Smooth concrete surfaces must be rough sanded just like vinyl floors to allow the tiling mortar some grip.
Knowing the kind of subfloor you`ll be installing ceramic tile flooring over is important. There are three main types of subfloors you might encounter: Vinyl. plywood. and concrete floors. Installing ceramic tile flooring directly to your vinyl or linoleum subfloor surfaces is greatly discouraged. One. it may contain asbestos fibers; and two. vinyl flooring is not a solid as good ol` concrete flooring. When installing ceramic tile on vinyl. experts would recommend rough-sanding. or scarifying. the vinyl floor surface first so your tiling mortar has good grip to set on.
What`s the property owner`s risk tolerance? Does he/she want to be rock solid sure of the stability of the floor? Even if that means spending extra money and/or time to reinforce the floor. and accepting a floor that may sit higher than surrounding floors? Or is some risk of failure acceptable if the floor is not built to the righteous standards of the TCNA? Sometimes the extra effort is not worth the cost to the property owner. who should be fully informed on all options. Contractors who install flooring shouldn`t assume that clients don`t care enough to solve the problem: in the last year we`ve had two clients who spend thousands of extra dollars to reinforce subfloors in a kitchen and laundry room when we explained that their floors were too unstable for tile. They really wanted tile. and were willing to make the subfloor ready for it. even if it cost more.
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.