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DHTiling
To stick the boards down you will need to use an adhesive suitable for adhering to green screeds and the boards are not un-couplers.. just insulators.
The expansion and shrinkage of a new screed might de-bond the boards, so it is worth asking the technical of the adhesive you will be using for it's suitability of what you intend to do and also for it's purpose of sticking insulation boards to a green screed.
The expansion and shrinkage of a new screed might de-bond the boards, so it is worth asking the technical of the adhesive you will be using for it's suitability of what you intend to do and also for it's purpose of sticking insulation boards to a green screed.