Precast Concrete Roof Panels: Strong, Efficient Roofing for Modern Construction

My latest idea is pre-fabricated, arched triangle, roof panels. 12 -18 ft wide--On the ground you build arched triangles in a dish shape. Finish the inside of the dish , flip the dish over, set with a crane and this becomes the ceiling of the dwelling.--No overhead plastering. A row of tiles inside, finishes interior ceiling.

The panels can either be set in a circular pattern to form a "dome" or  alternating in a line to roof a rectangular shaped room. Building triangular dishes-- start with insulation then structural layer and then polish the inside of the dish. THE HARD PART--Turn the dish over and stack it in vertical pile until the crane comes to set 8 dishes. Crane --reality check-- for these dishes on the first floor I'd say 4 hrs at $150/ hr is $600-- or $75 X 8 panels. Set the dishes and stick them together in the valleys-- form work very simple using plaster lath-- mix this pour on site, (pour out of a 5 gal bucket) and vibrate from above.1/2 yd should go a long way

This is the first roof panel we cast in Texas. More or less a sand cast in an old creek bed. This one was quick using semi-skilled folks . After curing a week this panel was drug out of the form with a backhoe.The owner plans on reinforcing/fixing the lower mold since we need 5 more roof panels from it and the idea seems to be working. More coming on flipping and setting the panels.