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.
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.
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.
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.
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.
Sika s experience would be to avoid cold roof design where possible.
A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck.
Ventilation is not needed in a warm roof.
No insulation is on top.
Sarnafil type a and type t.
They also work well over non nailable substrates such as concrete steel and wood decks.
In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall.
Sarnafil s327 el is mechanically attached to the substrate using either the sarnafast or sarnabar system and suitable sarnafil fasteners.
Installation is carried out by sarnafil trained contractors.
You only need ventilation in a cold roof.
Mainly due to the added requirement for roof void ventilation and the likelihood of cold bridging occurring.
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 cold roof ventilation in a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall.
In this way the roof itself is kept cold.
In general the installation of a cold roof is not recommended for the construction of new properties.
Sika sarnafil is the leading manufacturer of single ply roofing membranes for flat roof waterproofing.
Laps are then hot air welded to form seams which are stronger than the membrane itself.
