Sarnafil Cold Roof Ventilation

Insulation is laid below the roof deck typically between the rafters.

Sarnafil cold roof ventilation.

Good external ventilation is also essential to minimize the risk of condensation in a cold roof. 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. 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. Since the 1960 s the performance and longevity of sika sarnafil roofs has been demonstrated in.

Roof spaces must have ventilation openings on two opposite sides. You only need ventilation in a cold roof. Sika sarnafil is the leading manufacturer of single ply roofing membranes for flat roof waterproofing. Berkshire uses sika sarnafil s single ply membrane system on its roofs terraces and balconies.

This should ideally be in the form of soffit vents to the underside of the fascia boards but as many flat roofs were built without soffits it is often in the form of unsightly mushroom vents on top of the roof or soffit vents incorrectly fitted in to the fascia boards. Sika s experience would be to avoid cold roof design where possible. In a cold roof. 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. Sarnafil cold roof ventilation in a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall. 2018 recommends warm deck roofing designs wherever vertical space permits. Ventilation for cold roofs.

Without ventilation there is a risk that condensation will form on the underside of the roof deck. 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. 2011 code of practice for control of condensation in buildings stipulates that there should be a. 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.

Without ventilation there is a risk of condensation forming on the underside of the roof deck. In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall.