Uncoupling membrane - TilersForums.com

[jimbo]

I have a floor area approx. 30m to tile. Half is on exterior ply the other half on screed. Will I need to put down a uncoupling membrane over the whole area before I tile. The tiles are ceramic .

 

[jimbo]

Forgot to mention the floor will have underfloor heating

 

[Daz]

In principle, you do not require a decoupling membrane. You will just need to ensure that you have an expansion joint across the point where the two substrates meet.

However, things to consider are:
How stable is the ply floor? i.e. thickness, deflection etc..
Are you putting insulation boards under the UFH? (I presume it is electric UFH)
Do you intend to apply a floor smoothing compound over the UFH?

 

[White Room]

You will need a control joint between the screed and ply floor, what thickness of ply is fitted

 

[The Legend; Phil Hobson RIP]

Hi Jimbo, what thickness is the ply? decoupling also expansion joints to be considered Thickness of ply important, before we can advise

 

[The Legend; Phil Hobson RIP]

Triple response, same answer

 

[The Legend; Phil Hobson RIP]

Bet that is not a record though, knowing this forum

 

[Yorkshire Tiling Services]

Same

 

[jimbo]

Thanks for the quick response.It is 18mm ply and a wet piped system layed on insulation board. How can I disguise the expansion joint without it looking obvious

 

[Ajax123]

whilst it will do no harm I would not have thought uncoupling essential with ceramic but the joint is essential.

 

[DHTiling]

On domestic jobs, you can use what is called a Cold expansion joint.. this is basicly a joint of around 4mm to 6mm and silicone is used.. same colour as the grout to be used..

Mapei do silicones to match all the grouts in the ultra colour range..

 

[jimbo]

Thanks for your help Dave . I will take your advice

 

[Yorkshire Tiling Services]

Dural will make expansion joints to order, and match them to your grout colour
Based in Wakefield
01924 360110

 

[White Room]

Bet they cost

 

[Yorkshire Tiling Services]

On domestic jobs, you can use what is called a Cold expansion joint.. this is basicly a joint of around 4mm to 6mm and silicone is used.. same colour as the grout to be used..

Mapei do silicones to match all the grouts in the ultra colour range..

A viable alternative to metal expansion joints,but do not have as much longevity ! will inevitably need to be replaced !