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I'm affraid the problem with Bitumen is that it can be reactivated by the adhesive, despite it looking harmless enough now and so you must either get rid of it or prime it with something to seal it before using the adhesive and tiles. www.weberbuildingsolutions.co.uk is a good source of advice...

Hiya, I work for a natual stone flooring company and we always strongly recomend you either make sure all the bitumen is removed or better still use a de-coupling membrane before laying adhesive and tiles. Bitumen can often react with the adhesive which can lead to bleeding up through the...