uneven floor borards in the centre ? How too make level??

[2020Tiling]

Hi,
I have a slight problem on the job I'm starting next week, It's only a 4 mtr bathroom floor ,tiles going down are granite, floor is floor boards at the min with about 1 ft of concrete at the door way, floor has little movment when I jump on it. One of the problems is that when I lay my level across from side to side there is a dip in the middle of the floor around 1.5 inches! My plan was too over board with 6mm hardy , but I recon the dip will still be there. An ideas what the best way to solve this would be ? :mad2:

 

[Ian]

Get rid of deflection, then fit hardie, then SLC, the tile I've had to do this recently, not 30mm but maybe half that, used weber floor flex.

 

[2020Tiling]

Problem is , I have to complete it in 1 day so slc may not be an option! could I just build up the tiles with spf after I have overboarded?

 

[Ian]

Problem is , I have to complete it in 1 day so slc may not be an option! could I just build up the tiles with spf after I have overboarded?

Even a thick bed adhesive won't be suitable for that depth, they can only deal with 25mm max. Why only one day? Can't you do the prep the evening before?

 

[2020Tiling]

Also before I over board the floor boards with 6mm hardy and spf, is it ok to fill all the gaps in the floor boards with silicone?

 

[Saltire69]

Yes you can fill the gaps with silicone.

 

[area tiling]

Use bal fibre base leveller , straight onto your floor boards . Making sure their deflection free and solid first ! When it dries after 4 hours it's just like a cement backer board and has the same strength as 15 mm wbp plywood , plus you'll have a level floor , and no awkward cutting around shower trays or pipe work !
bal reckon that one 20kg bag will do 4m2 , costs about £30 a bag!

 

[Ian]

They all do 4 m2 but at 3mm depth, it'll take a few bags to fill a 30/35mm dip. And that depth won't be tileable in 4 hours, it needs doing the day before.

 

[area tiling]

No matter what you put down it will prob need to be done the nite before , just stating that even if it takes a few bags of fibre base it still would be a great option and faster !

 

[Ajax123]

Problem is , I have to complete it in 1 day so slc may not be an option! could I just build up the tiles with spf after I have overboarded?

No !! It's not a one day job!! Do it right or do it again