Warm Or Cold Flat Roof Construction

A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface.

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. This usually keeps the deck warm. It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the roof construction. The cold roof although not recommended today and actually banned in scotland until recently cold flat roofs were fairly common.

Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs. Hot tar and gravel. On a flat roof this could be air in at. 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.

Installing a warm roof can be extremely straight forward and simple to do. The 3 most common materials used for flat roof construction. Basically there are two options to choose from when insulating a flat roof. Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof.

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. Others would treat even steeper pitches as flat roofs. In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction. For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.

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. The recognised flat roof build ups for best design practices are. Warm roof designs will make the entire structure of the building warm in order to avoid cold bridging an element of the building that allows heat or energy loss. 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.

Ventilation is required for these roofs. In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm. The breakdown warm roof vs cold roof.