New DIY tiler introduction Screed issues - Tile Advice

[Deleted member 51481]

Thanks for the diagram 3 Fall, very useful. I asked for an explanation of how this company achieves a fall and the manager called me and gave me an overview as follows:
1/ concrete floor is made wet – apparently creates a better bond for the new screed as otherwise the moisture would be sucked out by the concrete

2/ datum points are made and tripods are positioned with ‘little spinning discs’ or something like that at intervals/sections

3/ Screed is made with slightly less water to make a ticker mix – 250 litres instead of 300 litres for example

4/ Screen is poured and tempered down gently

I emphasised how critical it is to get the level 100% flat as well as the fall and they said this not an issue and they have to deal with special jobs like this at least once a week – they have four gangs out on the road at any one point.

The manager also said that the screed by the bifold door cill (only the access door) could be as low as 10mm as it’s a small area so I might only have to deal with a 5mm lip which might not be noticeable but still keen to deploy your proposed solution.

Finally - he also advised that it would be cheaper for me to sand off as they charge £150 so I could hire a machine and do it myself.

 

[Old Mod]

Excellent thank you.
Very useful info.
I had made enquiries this morning actually, it’s good to get it confirmed by yourself too.

 

[Deleted member 51481]

Ok so I obtained a quote from another supplier and although it's slightly more expensive it seems a better product compared to the other. The first one mentioned above (http://www.tarmac.com/media/492582/topflowscreeda_datasheet_rebrand.pdf),
when I checked the spec minimum thickness is 30mm yet I need it to go down to 5mm in one section to avoid a lip on the bifold door cill. The product this new supplier has quoted minimum thickness is 5mm which is perfect. Also there is no sanding required. Makes me wonder why the other company didn't recommend using this instead. The only thing I'm cautious of is that it's not a wearable screed and you're supposed to tile straight after but I won't be able to do that until I have fitted a kitchen and stone worktops which is going to take three weeks and then it's Xmas and new year so long delays. So resolve one issue yet introduce another.
Please check it out and advise which route to take.
weberfloor 4320 fibre flow rapid - https://www.uk.weber/weberfloor-4320-fibre-flow-rapid

 

[Old Mod]

I’m not a Weber user as a rule, far as I know that’s just a fibre reinforced slc (self levelling compound)
That’s nothing like the first product you looked at.
That’s why it’s not a wearable surface, it’s more of a repair product.
I’m not saying it’s not suitable, in the right hands, it is, but they’ve got to be good to sort your floor.
Here’s some maths for you, it’s too late for me.
Slc on average consumption of 1.7kgs per mm per m2
You require 30m2 @5mm
And 30m2 @12.5mm
(Max height remaining from 30mm after first 5mm is 25, divided by 2 gives you overall thickness of 25mm to zero.)
That will give you the amount of slc required.
Divide it by 25 for number of bags required.
Think Weber are 25’s
Google the price of a bag or call a tile store, think Ctd keep Weber.
You’ll be able to work out labour costs very approx.

 

[Deleted member 51481]

I guess I won't get in trouble for discussing screedig costs on a tilers forum so I've been quoted £1k in cash which sounds a lot but I would struggle to get anyone reputable to go lower than that. Materials work out about £300 I calculated approximately and I'm not just paying for the day labour as its travel and specialist equipment (pumping machine maybe). The way I see it I get good flat level floor to tile off so I offset any experienced tiler costs by tiling myself. Any thoughts or concerns please.