Patio - Screed necessary ?

Middleage Fanclub

Issue: New build - Patio - Tiler refuses to lay tiles

So we bought R12 porcelain exterior tiles to go down on concrete which the builder has already laid, c.100sqm.

The tiler (same outfit we bought the tiles off) came out and had issue with the concrete, i.e. some pooling and levels not correct.

The builder disagrees, says the concrete is fine and accusses the tiler of being overly picky.

Tiler is suggesting a screed should be laid over the concrete.

I'm stuck in the middle.

What would it cost to get a screed laid and what is the minimum height (40mm?) as I don't want to end up with a patio higher than the level of the interior floor.

Any thoughts on my next move?

Strolling Bones

The lot of the self builder.
Expect a similar dispute between plasterer and decorator. (The plaster finish is to too rough to paint... no it is not ....)
And carpenter and decorator ( those doors opened and closed just fine before HE painted them...)
The electricain and the plasterer and the decorator. He ruined our work ( plastering/decorating) by putting in a late switch .. .they started before I finished ....

Ask the tiler for his costed proposal. Make him and him alone repsonsible for what he tiles onto. He more than likely required is a latex screed - 5/6mm tops.

Tefral

A screed on an outside patio?? Madness.

Tell the tiler get over himself or find another.

ht9zni1gs28crp

Hmmm Porcelain exterior tiles, max thickness of 20mm? I would be listening to the tiler and not the builder. After all the finish is what you will be looking at forever more.

Its not like a traditional conc slab of a dot fixing I guess. The porcelain would require a full coverage adhesive/grout thus dependant on a true and level screed beneath.

Middleage Fanclub

Tiles are 10mm thick.

Tiler has no interest in laying the screed but will not tile without a screed laid.

The builder is nervous of laying <40mm of screed (i.e. he won't guarantee the screed will not fracture in winter).

Thinner screeds are available but expensive (min 2k for materials).

Builder is talking about concrete board (25mm) instead.

Strolling Bones

Middleage Fanclub wrote: »

Tiler has no interest in laying the screed but will not tile without a screed laid..

The only way for you to proceed with some chance of "comeback" is to make one person responsible from concrete up - for selection of tiles ,adhesive , screed , accepatnce of the concrete below as suitable - everything.

Porcelaine crazy paving won't look too good and you don't want a bunch of finger pointers after.

Middleage Fanclub

Strolling Bones wrote: »

make one person responsible from concrete up - for selection of tiles ,adhesive , screed , accepatnce of the concrete below as suitable - everything.

Agree, but given the current position I'm in, I think that ship has sailed

Gumbo

Middleage Fanclub wrote: »

Agree, but given the current position I'm in, I think that ship has sailed

You are not the first and certainly will not be the last person to post on here complaining when their self builds get messy. People wanted to kill SI9 and take control of their own builds, this kind of thing is the outcome.

Even if somebody on here posts an excellent idea to fix your issue, are you willing to make the decision to say go ahead with this plan, it's your house and you have to live with it for as long as you can. This is where adequate supervision is required and they will make the judgement on what material is required, how much of it and where to place it.

Calahonda52

10 mm exterior tiles will need full coverage adhesive and even at that 10 mm is a bit thin IMO.
I would bring them back and start anew with a different supplier with different tiles.
A 40mm screed is not the answer either as it will not bond correctly to the concrete un less it is properly scabbled and etched.

Strolling Bones

sure what could go wrong ....

Tefral

Op, to do this right, get the builder you've hired to procure a tiler and the tiles. He has to stand over it then.

BryanF

https://www.tcnatile.com/faqs/55-tented-tile.html

Safehands

Calahonda52 wrote: »

10 mm exterior tiles will need full coverage adhesive and even at that 10 mm is a bit thin IMO.
I would bring them back and start anew with a different supplier with different tiles.
A 40mm screed is not the answer either as it will not bond correctly to the concrete un less it is properly scabbled and etched.

Start with a self levelling exterior screed (Cemflow Exterior by DCP). That can go on at 5mm up to 15mm, no primer needed. Going to be expensive though. Alternately, if you can go with 10 to 12mm, you can lay an SBR / Sand / OPC screed. Best to bond it with an epoxy, but you can use the SBR polymer in a slurry, on a dampened surface. That would require about 5 x 25lt at about €170 each.
No cheap option for 100 sq mt.