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Roof Waterproofing in Perth: Importance of Regular Maintenance and Repair


Waterproofing is a crucial aspect of roof maintenance that helps to prevent water damage, leaks, and structural damage to buildings. In Perth, where rainfall is common throughout the year, regular maintenance and repair of waterproofing to roofs is essential to ensure a safe and efficient living or working environment. In this article, we will discuss the importance of regular maintenance for waterproofing to roofs in Perth, and the repair items required to keep them in good condition.


To ensure the maintenance of a safe and efficient waterproof roof, it is important to follow a checklist of items that will help to identify issues before they become hazardous. The checklist should include:

  1. Visual Inspection: A visual inspection should be conducted regularly to identify visible defects such as cracks, holes, or deterioration of the waterproof membrane. These defects can cause leaks and water damage to the building.

  2. Drainage: The roof should have proper drainage to prevent water from pooling, which can lead to water damage and structural damage.

  3. Flashings: Flashings should be checked for proper installation and tightness to prevent water from entering the building through openings.

  4. Penetrations: Penetrations such as chimneys, vents, and pipes should be properly sealed to prevent water from entering the building through openings.

  5. Coating: The roof coating should be checked for any cracks, blisters, or peeling, as these can lead to water damage and the degradation of the roofing material.

Australian Standard AS 4654.2-2012 (Waterproofing membranes for external above-ground use - Part 2: Design and installation) provides guidance on the design and installation of waterproofing membranes for roofs. This standard should be followed for the design of any structural changes or repairs.


The National Construction Code (NCC) provides the minimum safety standards for building construction and ensures that buildings are safe, healthy, and accessible. The NCC has requirements for fire safety, structural stability, and accessibility that must be met for roofs.

Based on the findings of the checklist, a repair plan should be developed to address any defects and maintenance requirements. The repair plan should include:

  1. Repairs to visible defects such as cracks, holes, or deterioration of the waterproof membrane. These repairs should be made using appropriate materials, techniques, and equipment.

  2. Cleaning and maintenance of the roof surface to remove any debris, dirt, or plant growth that may cause water damage.

  3. Application of protective coatings to prevent future damage to the roof surface. Protective coatings should be correctly specified based on the type of roofing material and the severity of weather conditions.

  4. Compliance with relevant Australian Standards and NCC requirements to ensure the safety and structural integrity of the roof.

In conclusion, regular maintenance and repair of waterproofing to roofs are essential to ensure a safe and efficient living or working environment. The checklist items provided in this article should be followed to identify issues and defects before they become hazardous. Compliance with relevant Australian Standards and NCC requirements is essential to ensure the safety and structural integrity of the roof. A well-maintained waterproof roof will not only prevent water damage and leaks but will also improve the longevity of the roofing material and reduce maintenance costs in the long run.

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