Fitting Limestone to new concrete flow screed 80mm, wet UFH and main room is 11m x 5m!

[SteveH]

Hi all,
Ive been asked to lay limestone to a new extension, it has a main room 11 x 5m with smaller rooms off.
At present no expansion joints in slab and they say they are going to grind 8mm deep joint in middle of room and in doorways!
In my mind 8mm won't achieve anything ? I am proposing joints in stone in doorways and wanted one across middle of main room all fitted on decoupler.
However i am nervous that concrete has no full depth joints.
Any thoughts please?

 

[LM]

Hi all,
Ive been asked to lay limestone to a new extension, it has a main room 11 x 5m with smaller rooms off.
At present no expansion joints in slab and they say they are going to grind 8mm deep joint in middle of room and in doorways!
In my mind 8mm won't achieve anything ? I am proposing joints in stone in doorways and wanted one across middle of main room all fitted on decoupler.
However i am nervous that concrete has no full depth joints.
Any thoughts please?

Is there under floor heating in the screed?

 

[J Sid]

🙄title says wet ufh Lee

 

[LM]

🙄title says wet ufh Lee

Oh dear I did it again 🙁

Forums and looking after fighting teenagers doesn’t mix😵

 

[Dumbo]

Oh dear I did it again 🙁

Forums and looking after fighting teenagers doesn’t mix😵

Video the teenagers and we can take bets on them

 

[SteveH]

Is there under floor heating in the screed?

Yes mate, wet ufh 75-80mm down and zoned heating all in one slab?

 

[Ajax123]

Any cut joints are for shrinkage control unless they are made to the full depth. Shrinkage joints should be a minimum of 1/3rd of the total depth of the slab. 8mm deep joints are pointless

 

[SteveH]

Any cut joints are for shrinkage control unless they are made to the full depth. Shrinkage joints should be a minimum of 1/3rd of the total depth of the slab. 8mm deep joints are pointless

Thanks, yes I thought as much, probably more to appease the customer who asked about them whilst not wanting to nip a pipe! Shouldn’t there be full joints in slab if heating is zoned?

 

[SteveH]

Are there Brit standards for expansion joints in concrete with UFH and zones?There are none, manufacturer only says typically there should be and builder who fitted UFH etc says its screed suppliers fault!