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Can these boards be applied to existing plastered walls (in this case breeze blocks) and/or skimmed plasterboard? or does the existing layer have to be removed? Also - can you plaster over these or is plasterboard on top recommended?
TB4000 is a product that must be mechanically fixed, it cannot be bonded into position.
TB4000 must be finished with a mechanically fixed board such as plasterboard over the top. You cannot apply a plaster finish directly to TB4000.