Help!: Hi popped over from the electrical forum

[t&earth]

Hi Guys

I’m an electrician popped over from the other forum for some advice Please.

I want to tile my entire ground floor 60sqM using porcelain tiles, the only problem is that the previous floor covering was Marley tiles, which were all taken up to run central heating pipes etc. Now I’m left with a black sticky bituminous based adhesive, which I understand can not be tiled over!
I’ve been told by BAL that I can either re-screed the floor 30mm), scarify the floor removing the bituminous, or ply wood the area, all these suggestions are not an option for various reasons. However I’ve heard that you can lay a slurry mixture of SBR & cement powder and coat the floor with this first before tiling? Is this true or does anyone have a better idea if so I would be very grateful for some help on this.
As stated I’m an electrician and I have decided to do this myself having been let down twice with this job.

Many Thanks
Steve

[Dave]

Hi Steve and welcome

You need to remove as much as possible before you can even slurry coat

I take it that it is a screed floor and not timber, just with BAL saying to over board with ply on a screed IMO is wrong


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[t&earth]

Hi Dave

Thanks for taking the time to reply, yes it is a concrete screed floor. Can you suggest a method of removing the old bitumen. I've tried scraping it off but it takes forever just to do a small patch.
Many Thanks
Steve

[Dave]

The use of a hot air gun.. this will make it easier but on 60 mtrs it will be tiresome.. Have you thought about a floor sander... much quicker and not as messy as scabbling/scarifying .

The only other option is to use a backboard and mechanical fix but a pricey route..but do not use ply..

[tilerjason]

hi ive recently done a similar floor made from asphelt, due to the bitumen and chemical compounds the floor has to be totally sealed either by sbr with cement being added to create a creamy mixture and then brushed on and left to set or by using epoxy bond, normal acrylic bond will only last about a year or so before the chemicals start reacting with each other and start to break down the adhesive , ( thats only if its asphelt like mine ) hope this helps .

[t&earth]

Hi Jason

Thanks for the advice, I think I will probably first SBR the floor then when dry paint on the SB/ cement paste.

Many Thanks
Steve

[t&earth]

Hi dave
thanks once again for the advice, did think about sanding but thought the tar would clog up sand paper. Will try hot air gun.

Cheers
Steve