"Flat roofs are typically more cost-effective ... Then look to the existing structure to inform proportions, details, and materiality." ...

In Le Corbusier's 5 points of architecture, he advocates the inclusion of flat roofs hosting roof ... examples of these living roofs, including the structural detailing that makes them possible.

We are designing a pitched roof for our 1950s-era home that has an almost-flat torch-down roof ... building over the top of the existing roof structure. Is this something that might be problematic?