Tiling over a concrete floor which has already had a coat of PVA - TilersForums.com

[Harry89]

Hi

I have had specialists in to remove vinyl floor tiles containing asbestos leaving behind the bitumen adhesive (also containing asbestos) which they have encapsulated by giving a coat of PVA. What is the best way to go about tiling the floor? Its a concrete floor mostly covered in bitumen with a coat of PVA on top which I will tile with either a ceramic or porcelain tiles.

-will self levelling compound adhere to the PVA?
-will flexible tile adhesive adhere to the PVA?
-will a tile primer over the top help?

Any advice would be much appreciated.

 

[Time's Ran Out]

If you think there is asbestos in the bitumen and you paid specialists to remove it - GET THEM BACK!!
It's against the law to do it yourself and there's nothing you can do till it's removed.

 

[Harry89]

Thanks for your reply John, the quote I had from the asbestos company was only to remove the tiles and encapsulate the adhesive which is what they've done, they are a reputable company and I'm happy with what they've done. My main concern is will it be ok tile over the PVA/ bitumen? If so what is the best way to prep the floor? Removing the bitumen is not an option as it will be far to expensive.

 

[Time's Ran Out]

Unfortunately I'am not qualified in the handling of asbestos, but PVA would normally break down with the addition of a water based adhesive.
I would suggest you contact one of the major tile adhesive manufacturers technical departments for definitive advice.

 

[Harry89]

Thanks John I'll do that

 

[Tile Shop]

Would be interested to know who you speak to and what the outcome is on this one.

 

[Stevev]

Hi

I have had specialists in to remove vinyl floor tiles containing asbestos leaving behind the bitumen adhesive (also containing asbestos) which they have encapsulated by giving a coat of PVA. What is the best way to go about tiling the floor? Its a concrete floor mostly covered in bitumen with a coat of PVA on top which I will tile with either a ceramic or porcelain tiles.

-will self levelling compound adhere to the PVA?
-will flexible tile adhesive adhere to the PVA?
-will a tile primer over the top help?

Any advice would be much appreciated.

Just asking, how does one know that vinyl tiles has asbestos? what made you suspect they had asbestos in them?

many thanks

 

[ExplodingPudding]

Pretty sure that the Bitumen would blow the floor in the long run?

 

[Matt Bott]

Pretty sure that the Bitumen would blow the floor in the long run?

Like an exploding pudding ?

 

[Ajax123]

Thanks for your reply John, the quote I had from the asbestos company was only to remove the tiles and encapsulate the adhesive which is what they've done, they are a reputable company and I'm happy with what they've done. My main concern is will it be ok tile over the PVA/ bitumen? If so what is the best way to prep the floor? Removing the bitumen is not an option as it will be far to expensive.

whilst you are happy that they have fulfilled their contract i am not certain they have applied due dilligence and fullfilled their duty of care. if they knew you were going to tile the floor they should have highlighted the fact that PVA is not suitable to tile over. also, encapsulation implies temporary in the respect that if you tile the floor then at a later date you or a new house owner after you takes up the tiles you are potentially exposing them or yourself to asbestos which could be pproblematic particularly if you want to sell the house. have they given you any safety certificationmor assurance. many a reputable company routinely do poor work.