Jessica Tile Floors June 11th, 2018 - 18:31:56
What condition does the wood appear to be in? Even if the amount of wood support seems adequate according to the tables. if it appears to have been water damaged. if sections of it look moldy or corroded due to rot or decay. it`s not doing its job. Options include replacing or reinforcing it. but not just ignoring it. Also. has it been cut into in various spots. such as a plumber cutting sections of the joists for positioning pipes? All of these problems can make the wood less effective.
If a subfloor displays excessive deflection. it can usually be remedied by installing more plywood on top of it before tile is laid. and by reinforcing the joists from below. While it may make the floor higher than before. think of it as a sort of `insurance policy` against flooring failure.
What floor covering was on the floor before? If it had ceramic tile or stone. and the floor received reasonable traffic for years with no cracking or broken grout. it`s a pretty good bet that the subfloor is up to the job. If it was vinyl. carpet or hardwood. we are still in the dark.
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.