Home / Tile Floors / leveling a concrete floor before tiling / Basement Subfloor Options Laying Tile On Concrete Floor L Leveling Before Tiling Install Laminate Thumbnail Apps View Larger How Does Self Compound Work Over Cement
ggpk Tile Floors July 25th, 2018 - 08:15:46
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
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.
Can you cut into the layers on top to get a cross section of the existing floor? If there is a heating grate that you can remove. that may show the layers the floor is composed of. What will be reassuring to see is a thick layer. ideally over 1 ½ inches thick of plywood. Alternatively. with the property owner`s permission. we sometimes cut in to it to check what it`s composed of.
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.