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I need to install a suspended (dropped, false) ceiling under a flat roof. The primary aim, is to provide a carrier for a vapour barrier and 25mm of insulation under our POSI joists. At the same time, I'd like to create a generous service gap to carry water, electricity cable, MVHR piping and I suspect there'll be a bit of data cabling too. The span to bridge is less than 2 meters. The load on top of the joists is very small : just some insulation and a waterproof membrane. I have checked with the joist manufacturers and they say that what I propose is well within the design limits, and the BCO, when told, didn't even bat an eyelid. I've read these posts; @vivienz 's : her focus was lighting - there are some good ideas here, and I think we'll incorporate them @Barney12 has a similar focus, with @Declan52 and @Ferdinand contributing ideas on how the ceiling might be suspended . Again the focus was on lighting and visual effect rather than lowering the ceiling per se. I remember part of a post (which I can't find) by @JSHarris which focused on installing an occupancy switch in the space created by the suspended ceiling by his back door. I've watched lots of YooChube videos about the subject here's a list The POSI designer sucked his teeth a bit when I talked about screwing stuff to the bottom of the joists: I explained that SWMBO had vetoed me suspending my engine hoist from the joists.... My instinct is to KISS 3 by 2 wallplates 2 by 2 cross-pieces vapour barrier batten the 25mm insulation (under the vapour barrier) to the 2 by 2 cross-pieces plasterboard skim OR Screw some sort of simple support system to the bottom chord of the POSIs I'm at the ' its keeping me awake at night stage ' Help me untangle my brain about this one please!