For many years, traditional perforated ‘breather’ style wall wrap products have been the preferred choice to allow moisture to escape from building structures. However, the drive for more energy efficient construction has increased the requirement to better seal buildings as well as increase insulation levels to compensate for the greater use of lighter weight construction materials. These changes allow the external building structure to become colder and as a result management of internal water vapour becomes an important issue to avoid condensation formation. In this changing environment, selecting the right wall wrap is an important decision.

Unlike traditional perforated ‘breather’ wall wrap products, the high water vapour permeability of the Bradford Enviroseal range of vapour permeable membranes allow the escape of water vapour from within a building structure whilst preventing the entry of liquid water and dust from the outside environment. Positioned on the external side of the building frame, with the cladding spaced from the membrane to allow a drying and drainage path for moisture, Enviroseal membranes allow condensation to safely drain away from the building. These membranes provide superior permeability over perforated ‘breather’ products and meet the high water hold-out requirement for lightweight construction materials such as fibre cement sheet.

Benefits during construction:

  • Protects the frame and roof structure from water damage and saturation prior to the application of external cladding.
  • Wall wrap can improve on-site work flow efficiency by allowing some internal trades to commence work before the external cladding is applied.

Benefits after construction:

  • Reduces the risk of unseen mould and moisture related issues compromising the health of the occupants.
  • Improves air tightness which in turn improves energy efficiency, but still allows water vapour to escape without condensing on the inside of the building frame.
  • Protects the interior of the building from dampness by allowing it to dry quickly which helps maintain the structural integrity.

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