Wet UFH in screed, between joists covered with ply.

[Sean Kelly]

Wet UFH in screed, between joists covered with ply. Is this a thing?

I got a call the other day from a builder describing the above. He wants it tiled asap. I wont go and see it until the ply is down plus its a 40 mile round trip to the house.

English is not his first language and it was difficult to understand exactly what he was saying. However, the screed went down 2 weeks ago and he says it is dry. The UFH has not yet been commissioned. I won't go until it is dry, commissioned and ply'd.

I had to turn down a job last week as there was too much deflection in a 25sqm ply'd kitchen with wet ufh. It was like a bouncy castle.

Has anyone else seen this scenario?

 

[J Sid]

It is a thing😳
But very far from ideal

 

[Ajax123]

Definitely a thing but drought with danger...

 

[ttt tiling]

Those who supply the system say its perfectly suitable for tiling .....yeah right

 

[J Sid]

Those who supply the system say its perfectly suitable for tiling .....yeah right

They would say that.
Will they spec how it should be tiled and what fixing materials and methods they will guarantee?

 

[Dumbo]

They would say that.
Will they spec how it should be tiled and what fixing materials and methods they will guarantee?

Agree , I'm sure they just dream these systems up . Have any calculations been done on the joists for the extra load of 1.7kg per milimetre per square metre of the screed

 

[Ajax123]

It all depends on how the timber substrate is engineered. Some will no doubt be well built and properly engineered but other will not. Its the latter that you'll need to watch out for.