New Cemfloor Liquid Screed - TilersForums.com

[Timmy Mcguire]

Glynn, I agree 100% with your comment; but if the screeder is saying that he isnt going to sand the screed then why should it be the tiler that has to foot the bill for doing the screeders work? Have tilemaster carried out any tests on cemfloor screed yet?

 

[Ajax123]

Glynn, I agree 100% with your comment; but if the screeder is saying that he isnt going to sand the screed then why should it be the tiler that has to foot the bill for doing the screeders work? Have tilemaster carried out any tests on cemfloor screed yet?

The tiler should not foot the bill for preparing the screed. It should be priced for as part of the floor so that the client picks up the bill. Tat way it gets doe to the tilers satisfaction so there is no argument about whether its sanded enough or not. I have always felt that the sanding should be part of the preparation and as such is best carried out by the tiler. that is also the opinion of the Contract Flooring Association. That said the cost of sanding 100m2 is maybe £150 to £200. The cost for replacing the tiles if they fail for whatever reason will be significantly more and you can bet your life that neither the screeder, the screed supplier, nor the adhesive company will stump up any cash for that.

Its really very simple. Take the screeders word that it needs no sanding and take the risk and hope it works. It might well do but there's no real guarantee and there will be an argument as too who is responsible if it does go wrong... and it'll cost you. Sand the screed in the way you normally do and in the way you appear comfortable with so that you have the peace of mind that you have done it correctly and avoid the risk. As I said in my previosu post .... up to you. Not up to the screeder, BAL technical, the screed supplier or anyone else... its up to you.

 

[Glynn]

Ajax 123 is right and BS 5385 basicly states "make sure the substrate is fit for tiling". That is the fixers responsibility to make sure it is fit to tile. If you have to do the extra prep work then you should charge for it or explain and let the client organise it themselves. We have not done any testing with the Cemfloor Screed but would automaticly treat it has any other sand/cement screed. Sand, prime, fix.

 

[Lee@emctiles]

Well they say everyday is a school day.

Saw someone post on LinkedIn about CEMFLOOR

"Cemfloor pumped in, curing agent sprayed over, ready to accept tiles in as little as 2 weeks with no sanding or special primers."

Should have known to check here shouldnt i!

So it does need surface removal?

 

[Ajax123]

Well they say everyday is a school day.

Saw someone post on LinkedIn about CEMFLOOR

"Cemfloor pumped in, curing agent sprayed over, ready to accept tiles in as little as 2 weeks with no sanding or special primers."

Should have known to check here shouldnt i!

So it does need surface removal?

Yup. It has a during agents on which will prevent primer penetration and subsequent adhesion. Quite a few people have fallen for the "it doesn' t need sanding" spin but simple fact is that the cemex cstm certificate mention earlier in the thread is pretty categorical. It should be abraded...

 

[Dumbo]

Yup. It has a during agents on which will prevent primer penetration and subsequent adhesion. Quite a few people have fallen for the "it doesn' t need sanding" spin but simple fact is that the cemex cstm certificate mention earlier in the thread is pretty categorical. It should be abraded...

Can I take it that it can't be sanded for two weeks otherwise you will take of the curing agent

 

[Ajax123]

Dont know but would seem logical. Problem is so many screeners and suppliers are saying this does not need to be sanded so it' gonna go wrong at some point...

 

[Timmy Mcguire]

This screed is becoming more popular by the month and I’m coming across it more and more... I’ve tiled a quite few jobs now where this screed was used and I’ve followed the manufacturers instructions re not sanding and I haven’t had any failures yet(touch wood). I had a visit from the cemfloor rep and he said the agent on the surface acts as an evaporation control and as a primer once the screed as hardened. All I’ve done is give it a good sweeping with a yard brush and clean up any dust from the surface. So far so good from my experience tiling to it...