Vapour barrier foil
DS BLAU
Eurovent® DS BLAU vapour barrier foil has a high Sd value of ca. 100 m and provides an effective barrier limiting water vapour migration from inside the building into the thermal insulation. Its high diffusion resistance limits moisture ingress into roof, wall and ceiling structures, supporting the protection of thermal insulation and reducing the risk of condensation. High tear resistance ensures durability and facilitates quick and efficient installation.
Eurovent® DS BLAU is used as a vapour barrier layer in roof, wall and ceiling structures.
Advantages
- High vapour resistance – Sd value ca. 100 m
- Limits water vapour migration
- Reduces the risk of condensation
- Tear-resistant
Application and Technical Data
Eurovent® DS BLAU is designed to protect thermal insulation against excessive water vapour and moisture migration from inside the building. It can be used in ceilings, pitched and flat roofs, as well as vertical wall structures.
The foil can be installed parallel or perpendicular to the rafters, directly on the thermal insulation. Eurovent® UNISAN and Eurovent® DUO are recommended for airtight sealing of foil overlaps, while Eurovent® UNO is recommended for sealing connections with structural elements.
Vapour-tight
Fotos
System products
For proper and airtight performance of Eurovent® DS BLAU, it is recommended to use:
- Eurovent® UNISAN and Eurovent® DUO for durable and airtight sealing of foil overlaps,
- Eurovent® UNO for sealing connections with structural elements,
- highly vapour-permeable Eurovent® roof membranes, supporting moisture evacuation from the roof structure,
- Eurovent® windproof membranes, providing an external protective layer in wall structures.
Using compatible Eurovent® system solutions helps create an airtight and durable layer build-up and supports the protection of thermal insulation against excessive moisture ingress.
GOOD TO KNOW
How does DS BLAU differ from active membranes?
It is an LDPE foil with high, fixed vapour resistance. Its purpose is to strongly restrict water vapour migration through the assembly.
When is such a high Sd value used?
Where required by hygrothermal calculations or the adopted design solution. It is not an automatic choice for every attic.
Does foil thickness matter?
It influences mechanical properties and handling during installation, among other things, but is not the only parameter determining vapour control performance.
Can DS BLAU be used in flat roofs?
The product is also intended for these constructions, but flat-roof build-ups must be designed with particular care regarding moisture transport.
Are airtight overlaps still important with a high Sd value?
Yes. Even a very vapour-tight material will not form an effective layer if air can pass through leaky joints.
