Neither of those products are vapor barriers, so you need to assess the design and decide if a vapor barrier is required. Also, what is the finish? If its a ceiling, likely not tile. Will forward you the info in a separate email.
email me - robin@spectraspecs.com
Considering the level of quality you seem to be getting I’d be very hesitant to trap moisture in your ceiling assembly. I agree with the ‘tear it out’ attitude. Either that or they can pay for an air handling unit to provide a constant stream of ventilation and dehumidification above the ceiling (and the energy costs to run it) and the waterproof coating at the underside.
Realistically your client is probably best off just being on record to the developer that the assembly provided does not meet the Contract Docs and that future issues can reasonably be expected (I wouldn’t enumerate further).
Thanks Ken, your last statement would describe the entire project, this is the project where the developer insisted the Project Manual thickness be reduced…its been a problematic job from day one and as I’ve said the Developer refused to extend my services during construction administration, so all this time helping the architect solve problems has been pro bono. I must be slipping in my old age, this is one of those clients that has gone sans specs.
Still I believe in loyalty and in the past this has been a good client. Its amazing too because one of the partners has told me that he has learned how valuable specs are for construction, seems that his revelation has not translated into action.
For school shower rooms and interior swimming pools, I specify a water-based epoxy coating system. My understanding is the epoxy coating system has a low perm rating. Which takes care of the field area but not penetrations. Of course, the objection is cost. The painter must mix multi-component primer and finish coating.
It comes down to, if you want cheaper oats, buy the kind that have been through a horse once.