Self levelling questions and advice please

[John the tile]

Hey up.

Im tiling my uncles kitchen floor in a couple of weeks, and I want to do a good job. The floor is about 15sqm l cove.

Its concrete but the problem is its levels and uneveness is all over the place. Ive put a level and straight edge on it and there are 3 high points which are at the beginning then middle and then towards the end of the kitchen. In between each high point the floor dips down by about 15mm.


My plan was to make the floor dust free and then batten round the edges and doorways.

What do I prime the floor with. Is it an SBR/cement slurry or just sbr neat.?

How is it best to approach the actuall screeding as Ive heard you have to do it all in one hit.
Do i mix a few buckets up first..? I was thinking of just tipping the stuff in the dips untill they fill up to the high points. The thing is the high point are not level with each other.... Obviously going off the highest point in the kitchen.

How is it best to fill to a consitent level over the whole of kitchen. I was thinking of pre-drilling holes all over the floor and using screws and rawplugs and setting them level with each other.

Also, do you spread it about with a flat edged trowel?

Finally for now when is it you use the spiked roller Ive read about?

Thanks folks

[John the tile]

I was thinking of the mapei maxi aswell as this can go to 30mm...

[Mike]

i would try remove the high parts with a grinder/sander/sds drill. much better (and cheaper) to keep the slc to a minimum. sbr will be fine. i've never used levelling aids (screws etc) but some guys do, sounds a good idea. i've never used the maxi but the mapei renovation screed is by far the best slc i've used. if you get all your water measured and buckets ready you should be able to do that floor in one go on your own mixing one bag at a time if you're quick

[whitebeam]

I'd use a thinned out sbr just to prime the floor 3-1 and give the floor a good sweep before priming..

I use a blade 600mm with a handle..I don't use a spiked roller only when I was doing resin floors..

[northstar]

I use a blade 600mm with a handle ? got a pic of it whitebeam ?

[whitebeam]

Finishing spatulas with stainless steel blades for walls and ceilings scroll down to the bottom of the page..

[Alan.P]

As said, try taking the 3 high points out to an acceptable level, then check what your levels are like, I like using packer spacers to go around the room, stick them with a dab of something, if your levels aren't that bad after taking the humps out, you can do 1 of 2 things, slc, probably easiest, or go with a larger notch trowel, you could end up using a lot more addy, depends on the floor really.

[kilty55]

as above and baton the room /doorways mate

[John the tile]

Someone said above to take the high points out with a grinder. When I say high points I would describe them as 3 humps of about 250mm in length and the width of the kitchen (1.5m). Is that alot of area to be trying to hack out?

Would a grinder be ok to go through concrete substrate.?

[doug boardley]

if height isn't an issue I'd prime it with weber pr360 and then use weber floor flex slc,,,it can cover upto 50mm in one hit.

[Phil Hobson]

I am doing one atm, will get some pics on. This is the way I cope with bad floors, these are old pics, but give an idea of my method, Runners set with laser, formed with polymer sand/ cement/ sbr/ rapid set adhesive, concoction

[Wingn]

How do you form the runners? Interesting method.