First problem in 10 years....

[hmtiling]

i'd be surprised if it's anything other than a wet screed.

Ahem

 

[Danj]

Yeah it's looking that way, I just wanted to put it out there see if there was anything else that could cause it as I do have a good relationship with the builder. Now I just need to find an extra 4 days.......as normal.......

 

[Danj]

Thanks again for all the replies, this is the first time I've ever done this......great experience

 

[Danj]

Time to buy a moisture meter.....any advice?

 

[spooner68]

I've always put the guidelines for drying times and how to commission UFH into my quote so its in black and white. As the years have gone by this has become a standard (lengthy) paragraph but on the 2 occasions there have been problems I've found that either the screed hadn't been left to dry long enough or the UFH had just been cranked up to 11 from the off.
I always get the client to put a piece of polythene down under a brick/tin of paint/tile overnight to do a rule of thumb check. Have had to postpone a few times as it was still wet mind!
There's a lot said about decouplers but I have never seen the need on a concrete screed. Thoughts?

 

[Old Mod]

There's a lot said about decouplers but I have never seen the need on a concrete screed. Thoughts?

Well it would depend in what context you're referring to.
As an antifracture membrane or as a vapour barrier for fast tracking green screeds?
Either way, I think it's worth starting another thread as this is way

 

[J Sid]

would this problem have happened if a Schluter type uncoupling membrane was used, imho NO

 

[J Sid]

beat me to it marc

 

[Scott]

Schulter won't recommend it on a green screed with ufh either. Heating has to be commissioned before laying, they used to say it's OK but not anymore