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Sorry if this is draggin up old ground. I've read and heard conflicting info.
I'm a DIYer with a very small (just over 1m sq) floor to tile. The previous vinyl tiles have been lifted and left some bitumen behind.
EDIT: on reading some other posts it seems that this bitumen can be a few millimetres thick at times. Mine is just a wafer thin layer onto concrete, but definitely smells like bitumen. And there's one small area where it is quite thick, but that's going behind boarding so won't be tiled onto.
Some say it has to be scraped off.
Others say to use SPF adhesive and it can go straight on without scraping it off.
Then I asked in a tile showroom and was told to get most of it off, then PVA, then use their rapid set adhesive. Yet I've heard that PVA isn't a great idea.
At this rate, I'm beginning to think that there's no right solution and I may as well just bash on with it however I see fit.
I'm a DIYer with a very small (just over 1m sq) floor to tile. The previous vinyl tiles have been lifted and left some bitumen behind.
EDIT: on reading some other posts it seems that this bitumen can be a few millimetres thick at times. Mine is just a wafer thin layer onto concrete, but definitely smells like bitumen. And there's one small area where it is quite thick, but that's going behind boarding so won't be tiled onto.
Some say it has to be scraped off.
Others say to use SPF adhesive and it can go straight on without scraping it off.
Then I asked in a tile showroom and was told to get most of it off, then PVA, then use their rapid set adhesive. Yet I've heard that PVA isn't a great idea.
At this rate, I'm beginning to think that there's no right solution and I may as well just bash on with it however I see fit.