Quote Originally Posted by nova_robotics View Post
I disagree with you there. Concrete has an atrocious r value. Poured concrete is closer thermally to steel than any kind of insulation. It's the sitting down on a cold toilet seat of building materials. Generally we pour 4" over q-deck which I think is industry standard in North America, so assuming this pour is roughly the same thickness that'll get you an r-value for that whole roof of around 0.3.

Normally around here concrete roofs are specified with 4" of iso insulation laid on top for an r-value of 25, then the water-tight roofing system is installed over top of that. One single inch of iso insulation will get you an r-value of over 6. So one inch of iso insulates as much as 75 inches of concrete.
Maybe that is why most buildings in Kuwait were made with 12 to 24" thick concrete walls no other insulation, you can cool a reasonably sized apt with a single unit mounted in a window though, Central HVAC is or was when we were there was almost unheard of except for large hotels malls or things like that. But the roofs of buildings that were not steel would have several layers of bitumen sealed and topped with 2 to 3 inches of gravel.
Sorry but North America still mostly builds stick frame tender boxes waiting for a match to light them ablaze.
When this 50 year old 1800sq ft shack we live inn either gets blown down or burned down it will be rebuilt out of concrete and steel but with 4 inches of closed cell PIR insulation in every wall and 8 inches of metal clad PIR sandwich panels for the roof. When I tore the back room down to the studs after we got this place to get rid of black mold I built it back with 3-1/2 inches of closed cell self extinguishing PIR panels in the walls 6" in the celling 2 1/2inch layers of treated OSB decking and sheet metal roof the outer cladding has 3/4inch construction board covered with Hardy cement siding 2 3ft by 6 foot double pane vinyl framed windows. It is on the East and South side of the house and is not connected to the HVAC heat pump system so we heat it in the winter by a single 1200 watt electric space heater even when the temps last year stayed below freezing for 13 days it never got below 60°f, but that may be because the room is only 200 sq ft with 7 1/2 ft ceiling on slab.
However back to the sloped roof video there is nothing to suggest that they don't have insulation under the concrete nor that they will not be sealing the surface with some substrate. My money would be for gel coat then painted with a 100% UV stable paint. or colored gunite pool coating