Sarnafil Cold Roof Ventilation

Berkshire uses sika sarnafil s single ply membrane system on its roofs terraces and balconies.

Sarnafil cold roof ventilation.

Sika s experience would be to avoid cold roof design where possible. You only need ventilation in a cold roof. 2011 code of practice for control of condensation in buildings stipulates that there should be a. 2018 recommends warm deck roofing designs wherever vertical space permits.

Roof spaces must have ventilation openings on two opposite sides. Cold roofs by the way are not recommended for high humidity areas see the blog on how to insulate roofs of swimming pools saunas and high humidity areas. 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. Sika sarnafil is the leading manufacturer of single ply roofing membranes for flat roof waterproofing.

Cold roofs have the principal insulation below the structural deck and are recommended only for small or domestic roof areas where it is possible to provide cross ventilation above the insulation. In a cold roof. Insulation is laid below the roof deck typically between the rafters. Good external ventilation is also essential to minimize the risk of condensation in a cold roof.

Since the 1960 s the performance and longevity of sika sarnafil roofs has been demonstrated in. Some of britain s best known buildings feature sika sarnafil roofs and it is the system of choice for applications in education commerce retail leisure travel and many other sectors. Without ventilation there is a risk that condensation will form on the underside of the roof deck. Ventilation for cold roofs.

Sarnafil g 476 20 pds 0913 repl 0812 1 4 product data sheet sarnafil g 476 20 polymeric loose laid and concealed membrane for roof waterproofing product description sarnafil g 476 20 is a multi layer synthetic roof waterproofing membrane. Cold roofs are generally considered as difficult to design and construct and future upgrading of insulation requires invasive destructive means which should be kept in mind. 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. The design of cold roofs usually occurs when external abutment height provision is problematic thus making a warm roof not achievable.

An open cross ventilation space is required above the insulation to prevent condensation occurring in the insulation layer and compromising the integrity of the roof. Without ventilation there is a risk of condensation forming on the underside of the roof deck.