hardie backer slc

[diferentshades]

hi guys, have prepped my bathroom for tiling after using this forum as a guide. i have screwed all floorboards down tight, sbr primed and adhesive and screwed hardiebacker. while screwing the hardibacker down I noticed that the floor is not flat, it has a slope down to the middle, there is no bounce, just a slope i'd say about a 1/4 of an inch and then backup again. I tried tiling using large tile adhesive but i'm getting a lot of lipping. the tiles are 127mm by 800mm porcelain. my first tiling project by the way. really unhappy with the 8 or so tiles I laid so pulled them up! I was wondering if I clean up the hardibacker, can I use self levelling compound to flatten the floor? if so what type and should I prime the hardibacker. ( the return key has failed on my keyboard!)

 

[Gazzer]

I would just use adhesive now.

 

[Alan.P]

As above, use adhesive and a straight edge between high points, or, I see by your other thread your wanting a Pro in, you could leave it for them to sort out.

 

[Gazzer]

Thinking about it, you probably have a bowl effect on the floor. Really the tiles should all be lifted and level the floor before retiling.

 

[diferentshades]

Thanks for the replies. To be honest, I would rather do it myself but if I get real stuck then i'm not too proud to let a pro in, I've done everything else my self except the plumb and electrics. I have taken out the tiles and i'm now left with mostly adhesive free hardiebacker. Shall I at least seal it with bal sbr if so dilute? or just get on with adhesive. quick one though, could I part fill the dip with adhesive, let it dry then crack on?

 

[diferentshades]

Thanks for you replies, have taken out the tiles so i'm mostly left with clean hardibacker minus a couple of spots. shall I prime with sbr and then use adhesive to fillt he dips, wait till it dries then start tiling?

 

[DHTiling]

I would slc it.

 

[Martyn Leeds]

I'd get a quote.

 

[Kia tiling]

You'll be fine, if you've got the time then level it, if not then just SPF rapid n a big trowel. As far as priming, I tend to sbr everything and thin it depending on substrate...

 

[Andy Tiler]

I would prime,then slc!

 

[Qwerty]

I would prime,then slc!

Agree!

 

[diferentshades]

Hi guys, just saw all your replies... thanks for that. I all ready started tiling again, to late to get the slc. I started at a wall that I hadn't tiled yet, so far all is good! I started with a 6 mm trowel and back buttered the tile, this is where the floor is at its highest at the wall end. i'll probably go up to a 10mm then 12 mm as I get to the lowest point, checking with a straight edge as I go. I managed to avoid lipping so far by putting spacers under the corner of the previous row and as I put tile in the next row I have been sliding it back and forth till they sit together, probably wont work as I get to the middle of the floor but I think i'll have enough done to use a straight edge across the width and use my persuader! I might level the dip with some slc or carry on using thicker bed of adhesive. spoke to a lady from hardiebacker on Thursday and she said slc on top of hardie was a no no but she didn't seem to confident, besides I have seen posts where some of you guys have used it on hardie so i'll see how it goes. once again cheers

 

[Andy Tiler]

Hi guys, just saw all your replies... thanks for that. I all ready started tiling again, to late to get the slc. I started at a wall that I hadn't tiled yet, so far all is good! I started with a 6 mm trowel and back buttered the tile, this is where the floor is at its highest at the wall end. i'll probably go up to a 10mm then 12 mm as I get to the lowest point, checking with a straight edge as I go. I managed to avoid lipping so far by putting spacers under the corner of the previous row and as I put tile in the next row I have been sliding it back and forth till they sit together, probably wont work as I get to the middle of the floor but I think i'll have enough done to use a straight edge across the width and use my persuader! I might level the dip with some slc or carry on using thicker bed of adhesive. spoke to a lady from hardiebacker on Thursday and she said slc on top of hardie was a no no but she didn't seem to confident, besides I have seen posts where some of you guys have used it on hardie so i'll see how it goes. once again cheers

I've never had a problem with slc over Hardi,always prime it though!!!cant understand her telling you that!!!!!

 

[diferentshades]

Sounded like she was the receptionist, I'd ask a question then she'd put me on hold, come back and say 'my colleague says...' Anyways, coming up to the dip so I'll prime then use extra adhesive.

 

[Andy Tiler]

Sounded like she was the receptionist, I'd ask a question then she'd put me on hold, come back and say 'my colleague says...' Anyways, coming up to the dip so I'll prime then use extra adhesive.

Don't need to prime if your using adhesive! Just wipe the board down with a damp sponge!!