Warm Or Cold Flat Roof Construction

Cold roof construction requires that a suitable ventilated air space exists above the insulation layer within which the air is constantly mobile being replenished by fresh incoming air whilst the air resident within the void space is being expelled via a natural vent action at another point.

Warm or cold flat roof construction.

Flat roof constructions are generally classed as either cold or warm roofs depending on the position of the thermal insulation. Installing a warm roof can be extremely straight forward and simple to do. A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface. On a flat roof this could be air in at.

When we talk about a warm roof vs a cold roof what we re really talking about is the insulation of the flat roof. The recognised flat roof build ups for best design practices are. Others would treat even steeper pitches as flat roofs. The simplicity of a warm flat roof makes it one of the most popular designs providing an effective and easy way of insulating a building.

The breakdown warm roof vs cold roof. There are several methods and materials for the design of the exterior surface of a warm or cold flat roof. Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof.

Ventilation is required for these roofs. The cold roof although not recommended today and actually banned in scotland until recently cold flat roofs were fairly common. Basically there are two options to choose from when insulating a flat roof. This usually keeps the deck warm.

When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. The 3 most common materials used for flat roof construction. The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof. Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.

It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. Hot tar and gravel. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.