There are two main flat roof systems for a timber deck roof:
1. Cold roof construction
2. Warm roof construction
Cold roof construction is probably the most commonly known type of flat roof, however most new builds are opting now for warm roof construction, primarily because the insulation value is greater. There is nothing wrong with “cold roof construction” as long as it is correctly constructed and insulated and adequate ventilation is provided. The advantage of cold roof construction is that the overall depth of the roof can be kept to a minimum which may be necessary to allow for window openings, Fascia depth, etc. The roof surface is more solid and less likely to be damaged by foot traffic or falling objects and is slightly cheaper to install. Properly constructed roofs will last a lifetime if correctly installed from the start.