200sqm floor, prep discussion

[Doozy]

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

 

[Dumbo]

Ask the builder and the screede if they will put it right if it goes wrong if you do it their way . Me I would decouple and expansion joints

 

[Andy Allen]

What tiles are they using....??

 

[Simon Dale]

Decouple, expansion every 8mts i think ? My thoughts on expansion if their not in the substrate already do they work ??

 

[Simon Dale]

Tiled Limestone floor in Virginia Water longest run over 30 mts no expansion joints. Customer didn't want them no probs after 5yr app

 

[Doozy]

Tiles are 900 square Andy

 

[Ajax123]

Cant see what it has got to do with the screeder as to whether decoupling is needed or not.

 

[Alex Reed]

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.

 

[Benn Simmonds]

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.

 

[Alex Reed]

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.....?