Cracked screed

[rj1884]

Good evening.

I looked at a job where the client wants the swimming pool surround tile with UFH. I've done quite a bit of tiling in the house but they've asked if I could tile the swimming pool area. It's currently got a grubby bit of carpet laid over the existing screed. The problem is some parts of the screed have cracks in which I hope you can see from the photos. Also where the two white plastic covers are the screed appears to have turned a slightly greenly mould colour.
This will the first time tiling this sort of area. I believe the screed will need seeing to prior to tiling so my question is what's the best way to deal the cracks and would anyone know what the discolouration be.
I apologise if the photos come out upside down.

Thanks in advance.

 

[Ajax123]

The discolouration just looks like staining from the carpet. The cracks look like long term shrinkage cracks which will need either repairing or use ditra prior to tiling

 

[rj1884]

Thanks for the reply. The pool has been there for sometime so hopefully the movement has taken place. I plan to ditra the area for that particular reason but would you suggest repairing as well, if so how easy is the process.
Many thanks.

 

[Ajax123]

No need to do both IMO.

 

[One Day]

I hope they empty and clean the pool before using it! :yikes:

 

[rj1884]

Many thanks Ajax. If I were to repair it is it a straight forward process. Impish it's awful, I think things are living in it.

 

[White Room]

I hope they empty and clean the pool before using it! :yikes:

I thought it looked a bit skanky...:wacky:

 

[WetSaw]

Isn't there someone on here who specialises in pools? ;-)

 

[White Room]

Yes DPF pools....

 

[Chalker]

Where is that pool? Looks like a "pine log" building.

 

[rj1884]

It's in the rear garden in a wooden cabin. It was ridiculously hot in the measuring it up today. No rapid for this one.

 

[Ajax123]

Many thanks Ajax. If I were to repair it is it a straight forward process. Impish it's awful, I think things are living in it.

You would need to do what is called a resin stitch. Done properly this would involve cutting slots at rightangles to the cracks at roughly 1m intervals and dropping in a piece of stainless steel bar then the whole thing filled with epoxy or polyurethane resin. Most people just do the resin bit and ignore the need for cross crack lateral support. It's reasonbably easy to do but as I said its not necessary where ditra is used. I would moody recomend repairing it if you were not using ditra. The only other thing to be wary of is curling. If the screed has curled you might need to remove some to replace it. Looking at the pics curling does not look like it has happened.

 

[White Room]

Use to use stainless steel theaded bar many moons ago....

 

[Mr Tiler]

looks like you got some cracked screed there brother!

 

[Dougs Third Go]

I'd be going the ditra route. Could the disclouration be chlorine from the pool?......or maybe trail marks left by some slithering pond life? :yikes: