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Hi, I live in a 1930s top floor apartment with a flat roof above me. I’ve been considering getting new double glazing but I think my main issue is the roof is really poorly insulated which means the apartment gets freezing in winter and boiling in summer(31c at 1am and 26c at 7am). Is there a specific type that works best for residential? My brief searching seems to be that it’s mostly meant for commercial use and would make my apartment look a bit office like. Not sure if battening some type of lightweight insulation board against the roof and plastering over it would be a better solution? thanks

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!