How to lift old floor adhesive

[Twotanks]

Hi
Any advice on removing old adhesive from plywood floor? Previous tiler has used a cement based adhesive to lay glass floor tiles. Problem is whilst the adhesive has stuck really well to the plywood floor, it did not take to the glass tiles. The result is the glass tiles were very easily removed intact.

Have tried scraping the old stuff off, even tried softening it with steam but it wont budge.

Was thinking of the possibility of over boarding the adhesive layer or trying a new flexible adhesive on top of the old stuff.

I'm worried that the old adhesive will let me down in future and wreck the job.

Any tips would be much appreciated.

 

[Gazzer]

Probably easier and quicker to replace wood floor.

 

[White Room]

The adhesive can't be that deep as you had mosaics fixed, will you be fixing mosaics again

 

[doug boardley]

I'm with Sir Ramic, lift the old floor and replace with new wbp ply

 

[Twotanks]

The tiles were approx 8 inches square - blue/green glass type affair. The old adhesive is a solid bed approx 10mm thick.

Was thinking of lifting the wooden floor but that would be the last option.

 

[White Room]

Could prime and self level but be sure the old addy will remain fixed

 

[doug boardley]

I suppose you could go down the sds hammer drill route, with a 2" chisel bit, altho' it may knock hell out of your existing ply

 

[White Room]

Then your'll have to change it:smilewinkgrin:

 

[Twotanks]

Thanks everyone - I'll sleep on it and look forward to what tomorrow brings.

 

[lewis1967]

What did you do .... Self Level .. Re-Board ?

 

[TT Tiling]

i would reboard ,know the jobs good then
good luck

 

[ricmrc]

lifting the old ply and resheeting it is the safest and best option,

 

[Twotanks]

Evening all - I used an SDS drill with a 2" blade and it came off. Very little damage to the underlying ply floor. Will be retiling on top with the same glass tiles that came off. Previous tiler did the job about four years ago - adhesive stuck to the ply floor but not to the tiles. I think the grout was the only thing keeping it all in pace and when the grout started to go the tiles began to shift.

Thanks again for all the suggestions.

 

[Gazzer]

So what adhesive will you be using this time ?

 

[Twotanks]

Made an enquiry with the adhesive manufacturer - they say the problem was probably due to movement in the existing plywood floor. They recommend overlaying it and using a flexible adhesive. The stuff I use is Larsen and I find it very good.

 

[Tomtiler]

id use bals glass/mosic fix adhesive think it comes in a purple bag mite set u back few quid but worth it in my experiance