When Do You Uncouple?

[J Sid]

Over all wood, would you use it on a 4m bathroom floor. Floorboard, hardie, then 300x300 porcelain ?

If floor boards are solid then I would Ditra, even a 1m2 floor, if not so solid then I would HB it

 

[Flintstone]

I still don't see the benefit of it instead of boarding

 

[J Sid]

A lot quicker to prep the floor than HB if sub floor is solid

 

[MW Smith Ceramics]

Personally I would never ditra onto floorboards as this won't stabilise the floor, even if it is solid it's too many separated peices of wood for me, I've always over boarded with Hardi backer or no more ply 6mm or 9mm if possible glued with polyurethane adhesive and screwed......bombproof

 

[MW Smith Ceramics]

I don't always use them. Heated floor of a large size, yes. Small heated floor, not unless I'm fixing some weak stone. Fresh screed, yes. Anhydrite screed, always (at least until I'm convinced by gypsum adhesive). Typical thought process is highlighted by a job I'm soon taking on... 300sqm of high quality porcelain onto heated anhydrite screed. In theory i can tile direct using gypsum adhesive. Will i risk 15k worth of tiles popping? No way. Its ditra for me.

That gypsum based adhesive scares me too impish!.....don't mind laying the decoupling membrane with it ( Bal rapid mat mostly ) then flexi cement based addy

 

[Stef]

That gypsum based adhesive scares me too impish!.....don't mind laying the decoupling membrane with it ( Bal rapid mat mostly ) then flexi cement based addy

I've done a few gypsum floors & give me them any day over a cement screed.
Anhyfix for adhesive & as long as all rules are followed then there's nothing to be worried about.

 

[MW Smith Ceramics]

I've done a few gypsum floors & give me them any day over a cement screed.
Anhyfix for adhesive & as long as all rules are followed then there's nothing to be worried about.[/QUOTE

I've done a few gypsum floors & give me them any day over a cement screed.
Anhyfix for adhesive & as long as all rules are followed then there's nothing to be worried about.[/QUOTE

Are gypsum based adhesives recommended with British standards??.....I'm sure even if it comes to annhy screeds then British standards recommend priming then cement base addy

Can any of you technical gurus confirm???

 

[Stef]

I'm not sure what British standards state but why take the chance of putting cement in contact with gypsum when they are not compatible unless you create a barrier between the 2?

 

[MW Smith Ceramics]

Totally see where you are coming from there Stef........it just baffles me why gypsum based adhesives are not mentioned within British standards regarding tiling onto gypsum screeds, so you have Ardex, Bal & Mapei that all recommend priming then using cement based addy and this is British standards they follow, so regarding gypsum based adhesive who makes the rules

 

[White Room]

Totally see where you are coming from there Stef........it just baffles me why gypsum based adhesives are not mentioned within British standards regarding tiling onto gypsum screeds, so you have Ardex, Bal & Mapei that all recommend priming then using cement based addy and this is British standards they follow, so regarding gypsum based adhesive who makes the rules

They probably haven't caught up yet or haven't a clue about usage of it....