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The Proctor Roofshield and ProctorWrap breather membranes are textile products with a very low vapour resistance of less than 0.3MNs/g. These products should not be confused with some perforated foil type products labelled as ‘breathable’ that have a vapour resistance 10 to 70 times the minimum requirement in Europe.

Due to the increasingly high levels of insulation required, insulating and ventilating the roof is becoming more complex and the building industry is starting to recognise the need for real breather membranes

If using a foil faced blanket under a metal roof be aware that adding more insulation at ceiling level will likely bring the foil below dew point.

Fortunately if you are aware of the potential problems, expensive and embarrassing rectification can easily be avoided at the design stage for a fraction of the cost of fixing a problem once the building is occupied.

High humidity projects such as swimming pools, museums and libraries are particularly at risk and we recommend you carry out a condensation risk analysis. For further information on these issues, visit www.dctech.com.au/mba where an on-line presentation and a list of related resources are available.