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Doozy

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Got a site meeting next week where the installation of a 200sqm floor will be discussed.

There are a handful of smaller rooms involved on the periphery, but the main area is basically T shaped. The bottom of the T is the entrance hall at around 26sqm, which opens up on the top line of the T as a rectangular room of around 80sqm.

This is a sand and cement screeded floor over water piped UFH.

The builder says no expansion joints are required and the screeder says no decoupling is required either.

I obviously have my own thoughts on the matter, but I wondered what the consensus was on here
 

Simon Dale

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Tiled Limestone floor in Virginia Water longest run over 30 mts no expansion joints. Customer didn't want them no probs after 5yr app
 
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Got very similar sized floor to do in 3 weeks over a flowscreed (anhydrite). 800x800 porcelain. Using anhyfix to tile. Is a decoupler required? And hard or soft expansion joints and where? Am going to see it this week but would imagine there is no expansion joints in the screed. Any information/advice greatly appreciated.
 
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Got very similar sized floor to do in 3 weeks over a flowscreed (anhydrite). 800x800 porcelain. Using anhyfix to tile. Is a decoupler required? And hard or soft expansion joints and where? Am going to see it this week but would imagine there is no expansion joints in the screed. Any information/advice greatly appreciated.
If your using anhyfix by tile master And you want to decouple. Use anhyfix to lay anti fracture matting. Then use setaflex on matting. Cheaper way of doing it.
 
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Thanks. Is a decoupler required? We use them with natural stone but from researching am led to believe with porcelain and a flow screed it isn't necessary.....?
 
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Thanks. Is a decoupler required? We use them with natural stone but from researching am led to believe with porcelain and a flow screed it isn't necessary.....?
It' not really necessary but it' belt and braces. If you think you should use it then do. It will cost you more if the floor fails.
Personally I would Matt it and tile it.
 
D

Dumbo

If you look at the difference in expansion between porcelain and anhydrate there is a difference. Not sure what it is but their is and over a large area it matters because it adds up . So I would very much decouple
 

Chris Gibbs

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Thanks. Is a decoupler required? We use them with natural stone but from researching am led to believe with porcelain and a flow screed it isn't necessary.....?
I would use an anti fracture mat. Anhydrite floor isn't prone to big movement but when heating goes on underneath you cant be too careful. it also gives the customer confidence in your methods too knowing you're covering all bases.
 

Chris Gibbs

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on an Anhydrite floor

IMG_2077.JPG IMG_2083.JPG
 
D

Dumbo

I would use an anti fracture mat. Anhydrite floor isn't prone to big movement but when heating goes on underneath you cant be too careful. it also gives the customer confidence in your methods too knowing you're covering all bases.
I believe from figures quoted by @Ajax123 on a previous thread unless I misunderstood that the porcelain expands more than the anhydrate
 

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