An exterior ceiling covers areas outside the main enclosed living area of a house such as entertainment areas (Alfresco), carports and garages.

The different environments of exterior ceilings are often severe and can be effected by:

• The generally constant high humidity,
• The climate of the region,
• Wind loads,
• Garage Roller Door Vibration,
• Insufficient perimeter support.

To overcome potential problems in these areas it is important to consider the following points:

• The correct choice and installation of lining materials,
• fasteners, jointing and coating materials, designed to suit the environments,
• Correct placement and installation of battens and installation methods,
• The design and detail of the structural components and their protection from moisture,
• Final paint decoration.

Condensation

Surface condensation and wind loads can be the main causes of lining board and jointing system failure. Insufficient protection can lead to the plasterboard distorting as well as potential mould attack.

Use sarking or foil backed insulation underneath metal roofing as metal is more susceptible to condensation build up than roofing tiles.

It is important that ceiling cavity areas are well ventilated to prevent condensation build up. The installation of eave and gable vents, roof ventilatiors etc. can assist in this by providing permanent cross flow ventilation.

Building materials and systems may be adversely affected by these severe environmental and physical conditions, which if not installed correctly can lead to ceiling failure and or collapse.

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