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ggpk Tile Floors July 14th, 2018 - 08:07:13
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.
Fine. but how do you know if your floor meets the L/360 standard? We face this in the field all the time. but in remodeling. there`s not always a clear answer. There are published tables for calculating deflection. (including a really cool online calculator at http://www.johnbridge.com/vbulletin/deflecto.pl ) but they assume you have full knowledge of how the floor was built. To be able to use the engineering tables. you`d need to know how far apart the joists are. the length of the unsupported span. how thick the joists are. what type of wood and in what condition the wood is in. as well as how thick the plywood is. if any. Realistically. if all of this flooring is hidden by finished ceilings below and covered over by old flooring layers above. educated guessing takes center stage. The following questions help to determine floor stiffness using common sense guidelines
In residential settings. the most common substrates [surfaces to be tiled] for flooring are wood and cement. In this article we`ll deal with deal with wood subfloors. In new construction. it`s often possible to see the structure of the subfloor and joists and usually communicate with the carpenters who built them or the contractor in charge of the project if there are any questions. In remodeling. however. sometimes one can only guess who installed the floor and how strong it is. Maybe it`s as strong as a battleship. or maybe it`s about to fall through to the basement. If a property owner is trying to install the floor himself. he or she may wonder how to know if the subfloor is strong enough. Let`s start with the technical and then translate it to the everyday way to tell.
Tile floor installation is a clear-cut process. Once your contractor has determined your sub-floor can handle the weight and rigidity of tile. he designs a "map" so that the tile is straight. Next. adhesive is spread. and the tiles are "squished" into it. A level is used on each tile to make certain it is flush. and a rubber mallet can tamp down any spot that`s higher than the rest. Spacers are placed between tiles. until the adhesive dries them into place. Border tiles are cut to size and laid. The spaces are grouted. and when it is dry the tiles are cleaned. and sealed.