Whether this is due to:
- lack of upkeep
- lack of care
- a poor original design
- natural aging

Flat roofs can be renovated or totally repaired in different ways. An in-depth inspection and several surveys will be necessary in order to determine the best solution to use:

“Tired” Roof (20+ years) with a waterproof layer in bituminous multi-layers.
The possibility of recovery with a waterproof bituminous membrane on all surfaces while still retaining the existing elements. And better still, the possibility of starting work on a more complex renovation such as a double or improved roof.

A defective roof in which the insulating material is damp or dirty, etc. or a roof at the end of its life (30+ years):

Total repair of this kind of roof. For this type of operation, any roofing system may be considered (see the chapter for the types of roof). Nevertheless, the following points must be considered:
- the slopes present
- the storm water flow system
- heights of decoration
- sorting of waste