roof tile

Many home owners are eager to get their roof inspected when they book with us.

The roof can be an area of concern when buying a house, as you generally cannot make a good visual assessment of the entire roof from ground level.  Building and Pest inspectors are limited as to how much of the roof they can inspect.

In this blog we will explain the limitations of the building inspection and the various issues that can be found in roof area.

However, you should know exactly what parts of the roof are and are not inspected, during a building inspection.

The limitations of a building and pest inspection and your roof

When conducting a building inspection, there are limitations as to what can be inspected.

Firstly, safety must be considered. As such our roof will be inspected if it is safe to do so.

For the internal roof cavity to be inspected will depend on the dimensions of the manhole and roof cavity.

The manhole must be 400mm x 500mm to considered safe for an inspector to enter.

Similarly, the crawl space must be 600mm x 600mm for it to be safe to inspect.

In addition, the inspector will not enter a roof cavity unless it is safe to do so.  Hazards such as foil installation will prohibit a physical inspection of the area.

For the external roof, the inspector is also limited by the height of the roof. An inspector can conduct a visual inspection from only a 3.6m ladder if it is safe for them to do so.

Likewise, an inspector cannot climb onto a roof. This is for their own safety as well as the possibility it could do damage to your roof.

If closer investigation of the external roof is required, you should engage a company specialising in this service who has the equipment to perform the inspection safely.

Common Issues with roofs

Metal roof cladding

Metal cladding is commonly used as a form of roof exterior.

However, metal roof cladding comes with its own set of problems that can be found during a building inspection.


An example of metal roof cladding.

Rust and corrosion

During a building inspection, any rust found on your roof exterior, soffit, interior or anywhere else will be made note of.

Rust can come from many different places.

Metal proof cladding is designed to resist rust, which is brought about by exposure to moisture.

Damage such as scratches can expose the more vulnerable core of the metal to moisture, leading to rust and corrosion.

Similarly, if the metal cladding is designed using incompatible metals, this results in galvanic corrosion.

If a roof is made with steel and aluminium for example, it will quickly rust.

metal roof rust

A metal roof experiencing rust.

Using wrong type of roof sheeting for roof pitch

Particular types of roof cladding can be completely wrong for roofs of a certain pitch.

For example, having corrugated iron on a low-pitched house is a bad idea.

This is because of the dips found in corrugated iron, called valleys.

During heavy rainfall, these valleys overflow with water and pours into the gaps between adjacent roof sheets.

It trickles over the edge of the roof sheet and into the roof cavity. This can result in leaks, mould and other moisture damage occurring.

heavy rainfall

Heavy rainfall can result in major damage if you use the wrong type of roof sheeting for your roof pitch.

Roof tiles

Tiles are a popular form of roof exterior.

Roof tiles have different problems that your building inspector will look out for, compared to metal roof cladding.

roof tiles

An example of roof tiles on a residential house.

Exterior damage

Over time, the tiles that make up your roof will age and deteriorate over time.

Furthermore, they can become damaged due to exposure to the elements, protruding nails and people walking on your roof.

Damage such as cracks can cause water to leak into the roof cavity.

Tiles can also be knocked loose by animals or severe storms.

roof tile

An example of a damaged roof tile, seen from underneath.


Inspecting gutters is a regular part of a building inspection.

The main thing an inspector will look out for is if there is damage to the gutters or they are clogged by debris.

If your gutter is damaged or clogged, this can cause water to spill onto your property and seep into the foundation, causing structural issues long term.

A building inspector will let you know if these problems exist and will refer you to someone who can fix them.

debris in gutter

Debris in gutters. Debris can build up if trees overhang your gutter.

Looking after your roof following the building inspection

After your building inspection is completed, you will receive a detailed report with photo evidence of any issues found by the inspector.

The defects in your home will be considered either minor or major.

The report will also have recommendations listed. For example, an issue found in your roof will come with a comment such as “Maintenance by a licensed roofing contractor is recommended”.

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