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I am going to be tile my upstairs bathroom that has a wooden floor. It originally had wooden floorboards 22mm thick. We have removed all the tongue and groove floor boards as they were rotten and uneven. The joists were solid and in good nick.
It has now been sheeted with 22mm Ply and screwed every 4-6 inches along every joist.
However, the entire floor is not perfectly flat the room slopes to the corner of the room. From the highest to the lowest point in the room is about 11mm. In hindsight we really wish we had checked the level of the joists more accurately before screwing it down. However its not possible to lift it up with everything in place. We are going to use a fibre based self levelling compound (Bal Level-Max) and level the floor.
My question at this point is do we need to put down a decoupling mat on top of the self levelling compound when it has set or can it be direct tiled. These are long narrow plank tiles that emulate wooden floors. Also should I use an S1 https://www.tilersforums.com/forums/tile-adhesive/ or step up to a S2 https://www.tilersforums.com/forums/tile-adhesive/?
It has now been sheeted with 22mm Ply and screwed every 4-6 inches along every joist.
However, the entire floor is not perfectly flat the room slopes to the corner of the room. From the highest to the lowest point in the room is about 11mm. In hindsight we really wish we had checked the level of the joists more accurately before screwing it down. However its not possible to lift it up with everything in place. We are going to use a fibre based self levelling compound (Bal Level-Max) and level the floor.
My question at this point is do we need to put down a decoupling mat on top of the self levelling compound when it has set or can it be direct tiled. These are long narrow plank tiles that emulate wooden floors. Also should I use an S1 https://www.tilersforums.com/forums/tile-adhesive/ or step up to a S2 https://www.tilersforums.com/forums/tile-adhesive/?