gyvlon floor and I am the bad boy!

[Ajax123]

I will be happy to tell all the poor sods that have had a problem that it is ok as they are insignificant

Insignificant in the context of statistical analysis... It would be great if no failures occurred but there are plenty on traditional screeds and other substrates. Why pick on anhydrite alone...That seems a bit substratist

 

[Ajax123]

Most customers I've met haven't got a clue if it's a Gyvlon screed or not.

My usual answer is treat it as anhydrite anyway because what you do with anhydrite will work with other screeds a well.

 

[Gazzer]

They are not my instructions mate. I can oly say it how it is based on experience and testing in the lab. There is really no reason why the client should not do the test themselves itis hardly rocket science. I often Recomend to clients tha they buy themselves a hygrometer for 80quid which in the overall cost of a build is peanuts. The canteen test the screed and tell you when it's dry. Really that is how it should be in my opinion anyway.

I never said you did Alan , I am feeling little disillusioned with it all. I have a Hygrometer from a reputable company yet the instruction given are now wrong so it seems ??? Wait a bit while I get my crystal ball !

I am thinking of drafting a letter to give to clients with these floors that it is up to them or a third party to ascertain when the floor is dry and ready for tiling.

 

[jonnyc]

i dont want to get in to an argument here really but what i do know is that i have not found a single builder to date that has reused this type of screed if they have had to wait for the screed to dry properly.
they dont see the point of it.
many will have had tiles laid on damp screeds and will continue to do so till they have a problem.
when i ask why builders why they used anhydrite they all say because it is done quick and assured by their screed companies that it will save time.
with tiling only in mind what benefits does an anhydrite screed have apart from speed of screed installation.
i suppose two of those benefits are supposed to be that you get a dead level screed. not in most of the instances i have encountered. I have only laid on 15 or so of these screeds but most are no better than sand/cement with fibres.
the benefit is not having toi have as many expansion joints but i find this fallacy as well as have had cracks in screeds many occasions.
When a comparison is made to the uk and france and germany . i actually think they have had more time to get used to the product. this is quite new to us.
Just as much at fault are the screed layers not so much the suppliers of product.
they just dont have the experience

 

[macten]

My usual answer is treat it as anhydrite anyway because what you do with anhydrite will work with other screeds a well.

So straight away I'm adding on for hire of floor scarifyer, hygrometer that may or may not give me a reliable result, and the added cost of calcium based adhesive all on the off chance.
That's just great for my business that is.

I'm not having a pop at you Alan, you've always tried your best to educate us tilers with very informative posts and I accept that gyvlon is here to stay.
It's just that our job is hard enough as it is and in my own perfect world I just wish these screeds would disappear.

 

[macten]

What about these Gyvlon screeds that are sold to the client as zero laitence?
Do you still need to sand those?

 

[Gazzer]

My usual answer is treat it as anhydrite anyway because what you do with anhydrite will work with other screeds a well.

Just dont use a Gypsum addy on a cement floor 😳

 

[jonnyc]

sorry i lost half of what i wrote but i think it is quite unfair to suggest that we are just not moving with the times here.
tilers who have been in business over 20 years of which there area number on this forum have had to adjust to massive changes in product and type of execution and we have adjusted or would not be in business now.
yes we are behind france and germany on this anhydrite but until recently we werent even afforded the opportunity to readily get adhesive that is user friendly.
if we had now the screed companies with experience of our neighbours over the water who ahve been doing this for years and the adhesives we would not be having so many problems.
i have spoken with gary the tiler about this and he has had some experience in germany with anhydrites with no problems. why was this do you think. he didnt know what this was when he arrived im sure but he had screed companies that knew what they were and and adhesives available for this method

 

[jonnyc]

alan i think you have been very helpful about these screeds , but there is no doubt in my mind that they are the biggest problem for tilers at the moment.
in this difficult time for us all , i have had to turn down a number of very good jobs simply because the builder could not wait till the screed dried correctly. they all said they were sold a fast track arrangement and who has sold this to them.
i have not turned down any other very good jobs for any other reason in same period!!!

 

[Gazzer]

alan i think you have been very helpful about these screeds , but there is no doubt in my mind that they are the biggest problem for tilers at the moment.
in this difficult time for us all , i have had to turn down a number of very good jobs simply because the builder could not wait till the screed dried correctly. they all said they were sold a fast track arrangement and who has sold this to them.
i have not turned down any other very good jobs for any other reason in same period!!!

Thats exactly what i get too.