Laps are then hot air welded to form seams which are stronger than the membrane itself.
Sarnafil cold roof ventilation.
Sika sarnafil is the leading manufacturer of single ply roofing membranes for flat roof waterproofing.
You only need ventilation 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.
Sarnafil s327 el is mechanically attached to the substrate using either the sarnafast or sarnabar system and suitable sarnafil fasteners.
Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof construction this videos show detailed drawings.
This is when a gap appears in the insulation which becomes far colder than the main areas leading to condensation issues.
Mainly due to the added requirement for roof void ventilation and the likelihood of cold bridging occurring.
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They also work well over non nailable substrates such as concrete steel and wood decks.
Installation is carried out by sarnafil trained contractors.
Sarnafil adhered systems sarnafil adhered roofs are best for low sloped uniquely shaped or pitched roof applications composed of non nailable substrates such as pre cast or pre stressed concrete cementitious wood fiber or gypsum.
Fleece cushion layer.
No insulation is on top.
In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall.
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.
Sika s experience would be to avoid cold roof design where possible.
In general the installation of a cold roof is not recommended for the construction of new properties.
In this way the roof itself is kept cold.
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.
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.
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.
Ventilation is not needed in a warm roof.
The design of cold roofs usually occurs when external abutment height provision is problematic thus making a warm roof not achievable.
