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wwxl Tile Floors August 16th, 2018 - 16:25:08
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.
Is there an unfinished ceiling below to look up and measure the distance between joists and the condition of the wood below and how long the unsupported span is? A few minutes in the basement with a flashlight and tape measure can let you know if you have a winner (thick and deep joists. spaced closely together. in good condition. with a narrow span). or a loser (thin and shallow joists. irregularly spaced or spaced far apart. in bad condition. with a long span).
How tough is the tile to be installed? Fairly thick quarry tiles. for example. may be rated for heavy duty industrial applications. although they are often installed in homes. Because they are thicker than normal tiles and able to withstand heavy traffic. they may be less prone to cracking than a sensitive. thinner tile. For that matter. natural stone such as marble and granite are on the other end of the spectrum - they crack even easier than ceramic tile and should not be used in settings where any excess deflection is possible. Intuition may tell you they are stronger than ceramic. but in fact they are more brittle and prone to cracking. They need twice as rigid a floor as ceramic.
Measure Everything. The next step of your ceramic tile flooring installation is the accurate measuring of your floor and your tiles. This is necessary for you to be able to calculate exactly how many tiles you will need. You must measure the length and width of the section of floor you are going to tile and also the length and width of each tile. Then you must calculate. using these numbers. exactly how many tiles you are going to use. which will depend on the orientation of each tile as you have decided to place it on the floor. as well. Then you must find the mid-points of the length and the width of the floor you want to carry out your ceramic tile flooring installation process on; connect these midpoints to form a plus across the floor space. The intersection of the two lines of the plus is the center of your floor space; it is here that you must begin your ceramic tile flooring installation.