Pouring a concrete roof - GIF

[Frank S]

A sloped concrete roof? I've never seen such a critter. What are the advantages of this? Wind uplift, I guess, but it seems you'd still need a weather-tight roofing system installed over top of the concrete. So why use concrete as opposed to other lighter and more cost effective materials? I'm genuinely curious.

I'll give you lighter, but in some countries concrete is the most cost effective construction material there is. Once it is troweled out it will shed water just fine. It it is thick enough it will make a fair heat barrier against the sun