How Much SLC do you think I need

[Filip]

I have an outside area to level up and think I will be using Mapei P4, the area is 2.8 long x 1.3 wide and the lowest side is 18mm too low along the 2.8 length rising to a feather at the 1.3 wide mark. How many bags do you think I will need please.

 

[One Day]

Mapei Technical Support: 0121 508 6970

Best bet - try these.

 

[Filip]

I have just double checked with my local tilemaster supplier and ther is no problem with bringing back whole bags, so I think I will start with two

 

[Qwerty]

I have just double checked with my local tilemaster supplier and ther is no problem with bringing back whole bags, so I think I will start with two

Can you please let me know who allows you to take back part used bags, I could make a fortune on my 1/4 bags I have on jobs

 

[WetSaw]

Can you please let me know who allows you to take back part used bags, I could make a fortune on my 1/4 bags I have on jobs

Sarcasm is the lowest form of wit, well that's what I'm told...

 

[Filip]

Ok I am reporting back with my findings after doing the job.
3 bags were not enough and that stuff is a nightmare to get off your tools, even a trug bucket wont help because the SLC is flexible just spent about 2 hours cleaning the tools and guides. Next time if I nned to go so deep I will be going old school with a skim of cement and wait 1 mm per day which would be 1/6th of the cost in SLC.
So after all the prep work and expense I still need to bring the level up with thicker addy.
AND an end stop I made leaked and I have a lovely pool of SLC - self levelling itself all over my a joining slabs. Sand and cement don't do that !

 

[One Day]

Sand and cement needs to be pretty thick or it has no strength.
That's why slc was invented!

Use PU foam in a can to make an easy, effective dam that you can cut away afterwards.

 

[Filip]

Hmm maybe sand and cement for the thicker deeper bits and the SLC from then to the feather. I did notice when cleaning lots of cotton wool type filaments. I think you can get that for normal cement.
Because I messed around with it I had some areas that I needed to take down which are now a bit rough I am thinking of re priming - wouldn't hurt would it ?

 

[Chris N]

Hmm maybe sand and cement for the thicker deeper bits and the SLC from then to the feather. I did notice when cleaning lots of cotton wool type filaments. I think you can get that for normal cement.
Because I messed around with it I had some areas that I needed to take down which are now a bit rough I am thinking of re priming - wouldn't hurt would it ?

Now you've got the trough filled, why don't you re-level the whole area with SLC and have a nice flat surface to start from?

 

[Filip]

Now you've got the trough filled, why don't you re-level the whole area with SLC and have a nice flat surface to start from?

I still have another 10 mm -feather to go and I spat my dummy out over paying £60 for 3 bags and its still not level I am thinking of building that part up with extra addy today but that is £15 a bag so wont be saving much.
Can I add SLC to a floor with it already on and do I need to re prime.
I was told that the SLC is of for my outdoor use as it fits the requirements but to be honest it is nigling at the back of my mind that it is not a "full blown" exterior SLC but the Addy is.
Here is my post about that one

 

[Filip]

Can I use a fast set to level off then use normal set top of that.
It will be tilemaser stuff that says upto 12mm so on the level side it will be whatever a 10mm trowel creates but on the lower side it will be 10mm Plus the trowel depth. So if the fast set has gone off a little does that count as being a thick bed - too thick and lead to the below pul back.
My plan is to work on a couple of rows at atime so my the time I have done the first row the second row fast set has gone off enough to stand a little pressure of the trowel.
I don't fancy trying to use thick bed addy. Came across this when searching
you can use thickbed adhesive, but to be honest its not easy to trowel different thickness and keep the floor free from lippage, addy at differant depths can pull back when drying causing an uneven tiles

 

[Chris N]

I can't advise you on specific products, only to say that yes it may be expensive, but if you don't get it flat to start with, in the middle of tiling, you'll wish you had levelled it properly and would gladly part with money to take the pain away!

 

[Filip]

I can't advise you on specific products, only to say that yes it may be expensive, but if you don't get it flat to start with, in the middle of tiling, you'll wish you had levelled it properly and would gladly part with money to take the pain away!

Well that's far too sensible for me even though I have been in exactly the same situation may times before - gladly paying the extra when i am in up to my neck in it.

 

[Chris N]

Well that's far too sensible for me even though I have been in exactly the same situation may times before - gladly paying the extra when i am in up to my neck in it.

Well, there's a time to be a rebel, and tiling isn't the time.

 

[Filip]

Right I have a plan. I have rang tilemaster and I can use the thickbed in the way that I want which is to first lay it down flat to bring it up 10mm then when it has gong off enough to withstand trowelling and bedding I can use that again to lay the tiles on that side, then I can use normal set which I already have to do the right hand side as you look at the picture. I don't want to use the thick bed all over because I am not good enough to be quick laying. I will be using levelling clips.
Its never been asked before so they were not sure if it would shrink if I used a normal but quickset to 10mm then a normal set on top as it would still count as being over the 12mm recommended depth.