A 50mm air gap must be left.
Epdm warm flat roof construction.
This approach uses insulation with no air gap either immediately above or below the roof deck.
For that reason cold flat roof construction needs to keep in mind the need for unblocked airflow.
Continuously changing building regulations mean that the way your epdm flat roof is insulated insulation may need to be changed and your roof turned into a warm roof rather than the typical cold roof.
A vapour control layer must be used below the insulation.
Epdm rubber roofing has firmly established itself as one of the most popular options for flat roofing of all sizes.
It consists of six basic elements.
This is where the insulation is typically packed between the rafters.
The insulation material is placed immediately above the ceiling between the rafters.
The 3 most common materials used for flat roof construction.
A waterproof layer which resists water.
From there the flat roof system you choose will determine the materials you apply.
Hot tar and gravel.
Consider geography budget and use for the roof to determine the best option.
The guttering and gutter board has been remov.
A vapour barrier to prevent moisture.
Thermal insulation which retains heat within the building rather than allowing it to escape through the roof.
This option avoids the requirement to ventilate the roof.
Warm deck flat roofs can be constructed on most modern construction material types such as concrete timber and timber based sheets.
This type of roof construction has an insulation layer above the rafters and another layer immediately below its weather proof epdm membrane.
It helps to avoid condensation in the roof structure by ensuring the deck is maintained at a suitable temperature.
Warm deck roof construction repair and replacement with an epdm rubber roofing membrane most new flat roof extensions are constructed using the warm roof method.
To use epdm for a warm deck flat roof construction solid closed cell roof insulation such as kingspan or celotex should be placed on top of the roof deck rather than in between the rafters.
The benefits it provides and its cost effectiveness over a long term period have seen it become the flat roofing system of choice for many property owners.
A note to consider before construction.
Flat roof construction flat roof construction diagram warm roof.
There are several methods and materials for the design of the exterior surface of a warm or cold flat roof.
Above is a typical construction of a warm flat roof.
Less thermally efficient than a warm roof construction cold roof construction remains the most common form of construction for existing flat roofs.
