ggpk Tile Floors July 09th, 2018 - 18:02:15
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.
There are at least five good reasons tile surpassed linoleum as the flooring of choice: As you have just read. it is straightforward to install. You`ll be delighted with the efficiency of tile floor installation. It`s not unusual to lay a kitchen in less than one day. a bath in half that time. An expert tile contractor has fit and detail foremost in mind. and will never rush. but experience contributes efficiency to your project.
The need for repair is rare. but it`s easy to have damaged tile replaced. Ceramic is strong. but it has been known to break when significant weight is accidentally dropped on it. Replacement is as simple as removing broken pieces. laying replacement tile. adding new grout to the area. and perhaps new sealant. Keep a few tiles around so that they match if needed. The occasional wipe or mop begins and ends the care-free maintenance of ceramic tile. The sealant that was applied during tile floor installation made it impervious to water and stain. Ceramic tile comes as close to requiring no upkeep as any flooring available. Of course. tile needs regular cleaning. Because it is impenetrable to water. tile patios and utility spaces can literally be hosed down. You only need standard off-the-shelf cleaning products.
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