Tyvek® SD2 - Air leakage barrier / vapour control layer

Tyvek® SD2 is an internal Air Leakage Barrier/Vapour Control Layer for roofs, walls and floors.
Installing Tyvek® SD2 as part of the internal lining will help to reduce the rate of heat lost by convection through the building fabric. A continuous layer of Tyvek® SD2 will provide a barrier to air movement around the habitable space of the building.

Tyvek® SD2 has been specifically developed for use as an air leakage barrier, but will also contribute in controlling the passage of vapour through a structure. This will particularly apply to ‘vapour open’ constructions where a vapour permeable membrane is specified externally.

The overall 'breathability' of the construction is maintained with Tyvek® SD2 providing a balance between internal and external vapour resistances.