For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.
Warm or cold flat roof construction.
Installing a warm roof can be extremely straight forward and simple to do.
Warm roof insulation ensures the entire roof structure is insulated meaning a warm deck roof is more energy efficient than a cold roof.
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.
Basically there are two options to choose from when insulating a flat roof.
A cold flat roof insulation requires more work taking off old boards and replacing them and the roof surface.
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.
When we talk about a warm roof vs a cold roof what we re really talking about is the insulation of the flat roof.
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.
Hot tar and gravel.
The 3 most common materials used for flat roof construction.
The breakdown warm roof vs cold roof.
Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.
In case of warm roofs they have an insulation above the roof deck in this way it keeps the deck warm.
The recognised flat roof build ups for best design practices are.
When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.
Others would treat even steeper pitches as flat roofs.
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.
Ventilation is required for these roofs.
Flat roof constructions are generally classed as either cold or warm roofs depending on the position of the thermal insulation.
The cold roof although not recommended today and actually banned in scotland until recently cold flat roofs were fairly common.
It is the most acceptable type of construction for domestic possessions and belongings as it avoids the need for aeration of the 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.
This usually keeps the deck warm.
