Tiles won’t stick to bsa membrane

[Krystie]

hi advise is needed please I’m not a professional, we installed a wet room in December
Maxxus former
Bsa membrane
Mapei flexible adhesive
Ceramic tiles
Thought we had done a good job however this week we have noticed some of the tiles are squishing water through when we lifted said tiles they don’t seem to have stuck to the mebrane what have we done wrong.

 

[widler]

Did you comb the adhesive or put dabs under the tiles ?

 

[Bill]

Did you prime the membrane before you put the tile adhesive on it?

 

[Boggs]

Pictures always help.

 

[Time's Ran Out]

@Tom Astley - Prime the membrane?

 

[Waluigi]

Any UFH in the wet area?

 

[Bill]

@Tom Astley - Prime the membrane?

Yeah - I always do.

 

[One Day]

It's a bitumen membrane.
Why oh why oh why (etc etc etc) do people still install these?
Cement just doesn't like bitumen.
Underfloor heating definitely doesn't like bitumen.
Hot water makes it melt and release oil into the already weak adhesive bond.

With these membranes, if installed correctly you will achieve waterproofing. But in my experience everything on top gets ruined.

 

[Dumbo]

It's a bitumen membrane.
Why oh why oh why (etc etc etc) do people still install these?
Cement just doesn't like bitumen.
Underfloor heating definitely doesn't like bitumen.
Hot water makes it melt and release oil into the already weak adhesive bond.

With these membranes, if installed correctly you will achieve waterproofing. But in my experience everything on top gets ruined.

Am I right in thinking impey still have it as an option , if so why as waterguard is a far better product .

 

[widler]

Impey is brilliant, im sure impish doesn’t mean them

 

[Dumbo]

Impey is brilliant, im sure impish doesn’t mean them

I know as op mentioned bsa but I was just saying I don't understand why they still do it as they have waterguard .

 

[Waluigi]

Impey used to make a Bitumin membrane. You had to limit the temp of the UFH. It’s now been superseded by waterguard.

 

[Dumbo]

Impey used to make a Bitumin membrane. You had to limit the temp of the UFH. It’s now been superseded by waterguard.

But I believe they still sell tilesafe

 

[Waluigi]

Daft if they do.

 

[Qwerty]

Not sure if they do any more ..... @Impey Showers can you please confirm ???

 

[One Day]

I think many plumbers merchants are still supplying devil's flypaper because it's simply old stock.
I've been presented with it recently and sent it back to exchange for the new one (which is better but still rubbish in my opinion)

 

[Dumbo]

I think many plumbers merchants are still supplying devil's flypaper because it's simply old stock.
I've been presented with it recently and sent it back to exchange for the new one (which is better but still rubbish in my opinion)

Do you not use membranes or do you use them but a better one in your opinion

 

[One Day]

Do you not use membranes or do you use them but a better one in your opinion

Normally no. Odd time I've been asked to waterproof a room with an impey type tray I prefer to use kerdi.

 

[Time's Ran Out]

I love all the Impey products.

 

[widler]

I’ve only used impey and another, (I’ve only done about 10 wet rooms )no idea which ones they were,but I most defo preferred the impey way than any other , although impey is hard work , I prefer it to paste

 

[Krystie]

Hi guys many thanks for all your response it didn’t say with the instructions to prime the membrane on top but we primed underneath what would we prime on top with going to lift all the tiles it’s got a wet room former underneath the membrane

 

[Krystie]

There is no u dear floor heating

 

[Krystie]

 

[Krystie]

This is the kit that we brought but tray is 1200x900

 

[Bill]

Hi guys many thanks for all your response it didn’t say with the instructions to prime the membrane on top but we primed underneath what would we prime on top with going to lift all the tiles it’s got a wet room former underneath the membrane

A tiling primer - if you are happy with the Mapei adhesive then use the mapei primer. you can buy it 1kg bottles and that is all you will need.

PRIMER G - https://www.mapei.com/gb/en/products-and-solutions/products/detail/primer-g

 

[Time's Ran Out]

Although primer G is an excellent product , I see no need to add another layer of any primer to a waterproof membrane. Just make sure it’s clean an dust free. IMHO the tile adhesive is meant to fix direct to the membrane.
What type of adhesive did you use 1st time round?

 

[Krystie]

Mapei flexible for wetroom and swimming pools

 

[Krystie]

This is the product

 

[Dumbo]

This is the product

View attachment 105862

Did you buy that from b and q

 

[Bill]

can you take photos of the shower area, please?