Honestly if you have enough humidity in your loft to get server condensation problems then you need not to be worried about water proofing your equipment, you have bigger problems.Little bit of a "Necro" post, but thanks to all on here as this information will be properly helpful.......... when I can figure out what the heck any of it means...!!!
My situation is almost identical so be very interested to hear what the OP ended up doing and if possible what set up they used. @chukwe
Only difference is that I was going to try and waterproof the gear up in the loft as we have previously had sever condensation. We're hoping a new ridge tile system will prevent it happening again, but for the sake of a few quid on the right housings I think I won't risk it...
Oh, and with WiFi 6a now being a thing... is it worth me looking into that as an option for the AP's...?