The concrete roof supports hardened nicely and were ready for the roof.
The metal parts that form the roof framework were delivered and a few days later about 6 workers turned up to bolt the parts together. The parts were all marked like a flat pack piece of furniture from Ikea. This work only took 3 1/2 days. Impressive.
The metal parts were bolted / screwed together and had been manufactured by Modern Truss.
The roof tiles and heat reflector material were delivered a week later. In the meantime the construction of the walls began.
The foil like heat reflector and tiles were put in place the day after they were delivered. This time there were about 10 guys on the job. The roof was finished in a day. So all in all it took 4 1/2 days to make the roof. I was quite impressed.