Showing results 1-12 of 16

Rust on zinc/aluminium or aluminium/zinc alloy-coated steel roofing

  • Erosion of or scratching damage to the zinc/aluminium or aluminium/zinc alloy coating, exposing the steel

    How to repair

  • Lack of rain washing. Rain washing tends to be less effective on roofs with less than 15 degrees slope

    How to repair

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Rust on alloy-coated pre-finished steel roofing

  • Paint failure and subsequent erosion of or scratching damage to the zinc/aluminium or aluminium/zinc alloy coating, exposing the steel

    How to repair

  • Roofing material is in contact with or has run-off from cedar or redwood, or timber treated with a copper-based preservative treatment 

    How to repair

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Rafters or ridge beams sagging

  • Rafter spans too great for the timber size and/or roofing type, or roof framing has been overloaded

    How to repair

  • Poor quality timber, or cracked or broken timber

    How to repair

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Ceiling joists sagging

Zinc roofing – white surface corrosion

  • Lack or rainwashing. Rain washing tends to be less effective on roofs with less than 15 degrees slope

    How to repair

  • The roofing material is in contact with, or has run-off from, cedar or redwood, or timber treated with a copper-based preservative treatment 

    How to repair

  • View all repairs

Timber shingles/shakes – splits in the timber

Timber shingles/shakes – rotten shingles

  • Roof remains continuously damp due to insufficient cleaning or accumulation of debris such as leaves from overhanging branches 

    How to repair

  • Roof at the end of its serviceable life

    How to repair

Timber shingles/shakes – warped shingles

Timber shingles/shakes – moss and lichen

Timber shingles/shakes – stained shingles

Staining from cedar shingles