Glass roof over sleeping rooms, sounds of rain

I just quickly researched, this seems to be a good option. Since you can hardly see the roof anyway, it probably isn't too bad visually. What is "UK"?

As Tolentino already said, Unterkonstruktion.

If you want to go further in that direction, I could imagine two variants:

1. Laying/fastening the sandwich elements on minimally dimensioned wooden beams or (more likely) steel beams (depending on the span). Then I would consider leaving the substructure visible (wood looks good anyway, and the steel beams can also be treated accordingly), and otherwise designing everything that comes on the ceiling in the gaps as surface-mounted installation "industrial chic" on purpose.

2. Also conceivable would be a combination of cross-laminated timber ceiling elements (e.g., Ligno or similar) as "substructure," above that PIR/PUR insulation with aluminum sheet cladding – the wooden ceiling elements are available, as far as I know, from a thickness of 90 mm or 130 mm with cavity (total height including the visible wooden underside), with spans up to about 12 meters. This should make it possible without problems to stay around 25 to 30 cm total roof thickness, and you can use the cavities of the wooden roof elements as an "installation level."

If you want to save another 10 cm, you can of course also combine variant 2 with the already mentioned vacuum insulation panels, but the prices for those are pretty outrageous.

The roof surface is inclined so little that the dirt nicely stays on it. I wouldn’t want to have that with glass. On the ground floor it can still be cleaned somehow, but hardly in the attic.

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