How To Build A Cold Flat Roof

Types of flat roof construction warm and cold flat roofs.

How to build a cold flat roof.

As the name suggests a pyramid roof is a roof in the shape of a pyramid and is designed for a square building. There are several methods and materials for the design of the exterior surface of a warm or cold flat roof. The 3 most common materials used for flat roof construction. There must be an adequate void minimum 50mm between the deck and the insulation traditionally mineral wool to allow free movement of air and to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof.

Consider geography budget and use for the roof to determine the best option. Building regulations state that a ventilation gap of at least 50mm must be in place between the insulation and the underside of the flat roof deck. This arrangement allows the deck to become cold. A note to consider before construction.

In a cold weather such roofs are inherently prone to condensation which can cause material decay and deterioration. If insulation is installed below the flat roof deck this is called a cold roof. In the case of cold roofs the residential flat roofs have the waterproof placed directly on the deck and any insulation would be placed above the ceiling. Hip and pyramid roofs.

For both a warm and cold flat roof a vapour control layer must be installed. As such they allow for outdoor living gardens or a living space on top. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow. These roofs are mostly flat but usually have a bit of a slope.