Good luck,I can't imagine you'll have any joy from suppliers,I have a job in October with same issue,the architect has specified many things,in keeping with 'old ways' but negats the fact it's not practical
i passed it back too him too specify which product exactly I'm too use and confirm in writing he takes responsibility,suprisingly he at first said that's fine .....but several weeks later he's struggling too confirm the materials too be used