For this flat roof we used half inch fiber boards that were mechanically fastened. The membrane was glued down with TPO glue and then heat welded at the seams. 

The TPO membrane was ran all the way up the door to prevent any leaks into the home. The membrane was then fastened down with t-bar.

Both of the drains were remade using TPO. This will ensure that no leaks will happen through here since all of the water will be going to these areas. Flashing tape and cover tape were used to seal off the seams.