Standard Roof Pitch And Roof Types: Australia 2023

Pitched roofs are one of the most popular roof types, especially among residential buildings. This type of roof is highly versatile and can be adapted to suit all sorts of building designs, from traditional cottage to modern architecture. Pitched roofs also have enhanced water runoff, allowing rainwater to quickly flow away from the building, providing extra protection against water damage.

Pitched roofs also offer superior insulation properties due to the increased air space they provide. This type of roof structure also requires less maintenance than flat roofs, making them a popular choice for those looking for a low-maintenance roofing solution.

Pitched Roofs – What Are They?

The pitch of a roof determines its steepness in building construction. It is possible to have flat roofs or steep roofs of varying degrees. Depending on the pitch, certain materials are permitted for sheeting, such as corrugated iron, which has a minimum pitch of 5 degrees required. A minimum of 15-degree pitch is required for tiles. A roof design of 45 degrees pitch is would be considered very steep.

If the roof pitch is too low (low pitch) for the type of roofing material, pooling of rainwater can result in leaks.

The most common roof pitches in Australia are 15 or 22.5 degrees, depending on the roofing materials used.

Pitched Roof Issues: What Are The Most Common?

Homeowners can incur huge expenses due to obvious or unnoticed roof problems. In order to prevent future heartache, you should pay close attention to the roof of the property you are considering purchasing.

Cyclone-prone areas are more prone to roof problems. Wind can easily cause the frames to collapse if they aren’t properly braced and supported. A roof that has overhang can become detached from the walls if the wind creates an uplift underneath.

In addition to these issues, we have a number of others that are frequently encountered with roofs. You can get help deciding which property is right for you from an Action Property Inspections expert. Check them out and take note!

A Leak In The Roof

Leaks in the roof can occur for a variety of reasons. You must ensure your roof is watertight to avoid major building damage caused by leaks. Water leaks can be caused by clogged gutters or downpipes, rusted roof sheets, decay damage, mold growth, and major damage to a house. The dislodging or breaking of roof tiles can also cause leaks.

Depending on the roof pitch and the number of trees around the house, cleaning the roof will need to be done on a regular basis. The roof sheeting should be nailed down correctly and seals should be applied to any skylights or vents. Make sure the roof pointing and tiles are not damaged.

It is also important to inspect the flashing around the chimney and any other areas where the roof meets another surface. The flashing should be checked for gaps and any other signs of wear and tear. Properly installed flashing will help prevent water from seeping in. In addition, it is important to inspect the attic space to ensure that the roof decking and insulation are not damaged. Any signs of water damage should be addressed immediately as this can lead to costly repairs. Finally, it is important to keep a regular maintenance schedule to help identify any potential problems before they become major issues.

Downpipes And Guttering

Poor drainage systems and leaf buildup are the most common guttering problems. When the gutters accumulate water, corrosion begins to develop well before it should.

To protect the foundation and the house, gutters collect and divert rainwater. As a result, erosion will be reduced, leaks will be prevented, and painted surfaces will be protected from water damage. You can tell whether the gutters are malfunctioning if you see any water damage here. For the water to flow through to the downpipe and drain, gutters need to have a fall. Water collects in the gutter and corrodes it if this isn’t done, leading to a host of annoying and expensive problems. Check that your Action Property Inspections inspector installs the downpipes and gutters correctly and checks the angle of the pitched roof.

It is important to ensure that all gutters are regularly cleared of debris such as leaves and twigs. This will help to reduce the likelihood of blockages. If blockages do occur, water will overflow, potentially causing damage to the property or even flooding. It is recommended that gutters are regularly checked and cleared of debris to ensure that they are functioning correctly. Additionally, it is important to ensure that all downpipes are not blocked or cracked, and that they are correctly connected to the stormwater system. Regular maintenance will help to reduce the likelihood of costly repairs in the future.

Standard Roof Pitch Australia: Factors To Consider For Roof Pitch And Solar Panels:

You can reduce your electricity bills and increase your energy efficiency by installing solar panels. You need to determine if the roof on your home can support the solar panels you plan on installing if you plan on installing solar panels, specifically in terms of roof pitch. Solar panels produce power according to the angle at which they are mounted.

Incorrectly installed panels will not be able to self-clean in the rain, requiring manual cleaning more often, and they may not be effective in terms of the amount of energy they can generate.

The amount of sunlight your roof receives is also an important factor to consider when installing solar panels. If your roof does not get direct sunlight, your panels will not be as effective. You should also consider the direction your house faces, as the direction your house faces can affect the amount of sunlight your roof receives. Additionally, you should consider the weather and climate in your area, as this can affect the amount of sunlight that your roof receives. The angle of your roof also affects the amount of sunlight it receives, so you should consider the pitch of your roof when installing solar panels. The angle of your roof should be between 30 to 40 degrees in order to maximize the amount of sunlight it receives.

Skillion Roofs

Modern homes often feature Skillion roofs. Skillion roofs have a single angled roof that creates a simple, yet modern design. An ideal pitch for a skillion roof is between 5-12.5 degrees, which ensures good water drainage and runoff. Material types available for skillion roofs below 5 degrees are limited due to poor drainage. As an example, standard Colorbond cannot be used on Skillions under 5 degrees. In order to allow for sufficient drainage, materials must have a wider profile. Skillion roofs with low pitches can be constructed with Trimdek or Kliplok, which are commonly used for shallow roof pitches. The roof line can span up to 12m, and they are also called mono-pitch roofs.

In addition to its modern aesthetic, a skillion roof has many practical benefits. It is a great choice for areas with high wind and snow loads, as it is designed to be more aerodynamic and hold up better against extreme weather conditions. A skillion roof is also a great choice for areas with limited space, as it takes up less vertical space than other roof types, allowing for more usable living area underneath. Furthermore, a skillion roof is generally easier to construct than other roof types, allowing for a faster installation. As such, a skillion roof can be an excellent choice for those looking for a modern, practical roof solution.

Gable Roofs

In terms of roof design, a gabled roof has sloping sides that meet at a ridge at the top, forming a triangular extension. Gable roofs come in various designs, including the front gable, the box gable, the cross gable, and the Dutch gable. Roofs with gable pitches of 30 to 35 degrees provide excellent drainage. If gables are designed at the ideal pitch, then there is sufficient fall for snow and water runoff.

Gable roofs are a popular choice for many homeowners because of their attractive aesthetic appeal. The triangle shape of the roof can create a pleasing visual effect and give a building a sense of height, which can be beneficial for smaller homes. Additionally, gable roofs can provide more headroom for tall people, can be constructed with a variety of materials, and are relatively easy to construct and maintain. Gable roofs also offer the advantage of being able to accommodate attic space, making them an ideal choice for homes looking to add an extra level of living space.

Hip Roofs

It is common to have hip roofs with flat eaves because they are the most cost-effective. A hip-style roof has slopes on each side, meaning it has three or four equal-length sides that form a ridge at the top. Suitable for high wind-rated areas, hip roofs are strong, sturdy, and durable. Australian coastal regions are particularly popular for hip roofs, but they’re suitable for all types of climates. A hip roof with tiles should have a pitch of 25 degree pitch, while a colourbond roof (metal roof) should have a pitch of 22.5 degrees.

In addition to providing stability and strength, hip roofs also offer a unique aesthetic to any structure. With their unique ridged shape, they can create a unique silhouette that stands out from the traditional gabled roofs. Hip roofs are also a great way to increase the amount of space available in the upper levels of a building, as the sloping sides can create additional floor space. Hip roofs can also be used to provide a sheltered outdoor area, allowing for outdoor activities to be enjoyed during wet and cold weather. For these reasons, hip roofs are becoming increasingly popular in a variety of residential, commercial, and industrial buildings.

Parapet Wall Roofs

With a roof profile that is simple, with clean lines, parapet wall roofs provide a modern look. To create a modern façade, parapet wall roofs utilize a low pitch hip valley roof or skillion roof. The design, roof, and fall of the building can make construction complex and challenging. This results in a box gutter that aids in drainage behind the parapet wall. It requires more maintenance than other types of roofs, mainly because debris gathers on the roof without any place to go.

Parapet wall roofs are generally constructed with a parapet wall of masonry, metal or wood. The wall serves to hide the roof edge, water and other roofing elements. It also provides additional protection from the wind and rain. These walls act as a guard for any roofing material that may be used, and they provide an additional layer of safety in case of a roof collapse. The walls and roofing materials must be maintained regularly to ensure that the roof remains watertight and secure. To prevent water from entering the building, the parapet wall should be constructed with a waterproof membrane and a gutter. These features help to ensure that the roof is kept watertight and secure.

Butterfly Roofs

Two planes slope toward a central point to form a butterfly roof that resembles a butterfly’s wingspan. While butterfly roofs are attractive, they are a complex roof structure and therefore are difficult to install, increasing labor and material costs. A butterfly roof is extremely aerodynamic, so it is more resistant to wind damage than a conventional roof. The central drain area can, however, become clogged with debris, resulting in drainage problems.

In order to avoid drainage issues, it is important to ensure that the butterfly roof is properly sealed and that any gaps or openings in the roof are covered with a waterproof sealant. It is also important to use quality materials when installing a butterfly roof to ensure it is able to withstand the elements. Additionally, gutters should be installed to collect and direct rainwater away from the roof. The butterfly roof should also be regularly inspected and maintained to ensure the roof is in good condition and functioning properly.

Cost Implications Of Roof Pitch

The cost of your build will increase significantly if the roof pitch is over 35 degrees, as engineered trusses are required. There are only a limited number of roof sheeting products that are suitable for a shallow roof pitch of 2 degrees: Trimdek and Kliplok, for example. A roof design that can withstand the weight of snow is also important if you live in an alpine area where it snows. For example, if your roof pitch allows snow to drain from the roof, you’ll need a roof design that can carry the weight. A mesh gutter guard and roof snow guard are also required. Buildings are also often required to have French drains around the perimeter.

Labor costs will also increase with a steeper roof pitch. Contractors will need to take extra safety precautions when working on a steeper roof, which can add to the cost. More time will be needed to install the roofing material, and additional materials may be needed to brace and support the structure. Additionally, the cost of materials such as flashing and sealants will be higher for a steep roof pitch.

Overall, the cost of a roof with a steep pitch will be significantly higher than one with a shallow pitch. It is important to factor in all of the costs associated with the roof, including materials, labor, and safety precautions. Additionally, it is important to consider the weather in your area and the roof design needed to withstand the elements.

In regard to roof material needed for the entire roof, a low roof pitch typically requires more materials per square meter compared to a higher pitched roof. This is because a lower pitched roof has a larger surface area, which requires more roofing materials, such as shingles or tiles, to cover. On the other hand, a higher-pitched roof has a steeper slope and a smaller surface area, resulting in less material needed.

Pitched Roofs On Verandahs In The Tropics

You may want a hipped or gable roof for your house because they shed water easily and provide more ventilation in tropical climates. Being able to keep the area cooler definitely has a positive impact. Compared to other complex designs, their simple design makes them very easy to build and much cheaper to manufacture.

A quick way to dispose of water and provide shade is absolutely necessary in a tropical humid climate such as Queensland. During the summer months, you wouldn’t want a house with rainwater collecting on the roof – the roof would sag and you may even sustain water damage. Colourbond or corrugated iron are the most commonly used materials for pitched roofs in tropical parts of Australia because they are lightweight compared to tiles.

Since the roof is pitched, it will provide a natural way to draw air up and out of the area, allowing for a better circulation of air and cooler temperatures. This is especially important in the tropics because it can get extremely hot and humid. Additionally, the roof can be angled to direct rainwater away from the verandah and into gutters, allowing for easy drainage. Having a pitched roof on your verandah will help to keep it safe from water damage and provide a pleasant place to spend time during the hot summer months.


Q: What is a 22.5 degrees roof pitch and what are its benefits?

A: A 22.5 degrees roof pitch refers to the angle at which the roof slopes. It is a common roof pitch in Australia and offers several benefits. It provides good water runoff, prevents rainwater from collecting on the roof, and reduces the chances of water damage. Additionally, it offers superior insulation properties and can withstand high wind and snow loads, making it suitable for various weather conditions.

Q: Why is it important to adhere to roof pitch Australian standards?

A: It is important to adhere to roof pitch Australian standards to ensure structural integrity and safety. These standards provide guidelines for designing and constructing roofs that can withstand various weather conditions and minimize the risk of damage. Adhering to these standards also ensures that your roof meets the requirements set by regulatory authorities and building codes.

Q: What is the minimum roof pitch for snow in Australia?

A: Of course there are not many parts of of Australia where this is an issue. The minimum roof pitch for snow in Australia depends on the specific location and the amount of snowfall in that area. In general, a steeper roof pitch is recommended in areas prone to heavy snowfall. This helps the snow to slide off the roof easily, preventing excessive weight accumulation that can lead to structural damage. It is advisable to consult local building authorities or professionals to determine the appropriate minimum roof pitch for snow in your specific area.

Q: What are the benefits of a 35-degree roof pitch?

A: A 35-degree roof pitch offers various benefits. Firstly, it provides excellent water runoff, reducing the risk of water damage to the building. Secondly, it has a steeper slope which helps in the natural removal of snow from the roof, making it suitable for areas with heavy snowfall. Additionally, a 35-degree roof pitch offers enhanced insulation properties and can withstand high wind loads, ensuring the safety and stability of the roof.

Q: What is the standard roof pitch in Australia?

A: The standard roof pitch in Australia can vary depending on the specific location, architectural design, and other factors. However, commonly used roof pitches in Australia range from 15 degrees to 30 degrees. It is important to consult with professionals or refer to local building codes and regulations to determine the appropriate standard roof pitch for your specific project.

Q: What is the minimum fall for corrugated iron roof in Australia?

A: The minimum fall for a corrugated iron roof in Australia refers to the minimum slope or pitch required for effective water drainage. The recommended minimum fall for corrugated iron roofs is typically 5 degrees. This ensures that rainwater flows efficiently and prevents water from pooling on the roof, which can lead to leaks and water damage. It is important to follow manufacturer recommendations and building codes for the specific corrugated iron roofing product being used.

Q: What type of roof is a 22.5 degree roof pitch in Australia?

A: A 22.5 degree roof pitch in Australia refers to a moderately sloped roof that is suitable for many common roofing types and meets relevant building standards across different regions. It offers a good balance of drainage, weather resistance, and material suitability.

Some key points:

  • 22.5 degrees is a common roof pitch used in Australia (Sources [3], [4]). It provides good water drainage and runoff compared to flatter pitches.
  • It is suitable for both metal/Colorbond roofing and tiled roofs, while meeting requirements for waterproofing and wind resistance (Sources[2], [3], [5]).
  • For metal roofing like Colorbond, 22.5 degrees is an optimal pitch recommendation by manufacturers (Source[6]).
  • For tiled roofs, 22.5 degrees meets the minimum pitch requirements according to building standards (Source[7]).
  • Other common roof pitches in Australia are 15 degrees for lower-pitched metal roofs and 25-35 degrees for steeper tiled roofs (Sources[3], [5]).
  • Factors like roofing material, climate/weather conditions, and building codes determine the ideal pitch (Sources[3], [5]).


Some Related Terms

Standard corrugated roof:

The most common roof type in Australia, made of corrugated metal sheets.

Minimum slope:

The shallowest angle at which a roof can be installed to still shed water effectively.

Roof slope:

The angle or slant of a roof surface, typically measured in degrees or roof pitch.

Minimum roof pitch:

The lowest roof slope that is acceptable per building standards and codes. In Australia this is often around 15 degrees.

Roof angle:

The precise angle measurement of a roof’s slope, ranging from close to flat to very steeply pitched.

Pitch of the roof:

Another term for roof slope or angle, referring to how much the roof rises vertically for each horizontal unit. For example, a tile roof will typically be from 15 to 30 degrees.

Length of the roof:

The horizontal dimension or span of the roof. This affects choices of roof slope and pitch.


Overall, the type of roof you choose for your home is a very important decision. Different roof types have different benefits and are suitable for different climates and conditions. When selecting a roof type, it is important to consider the style of your home, the weather in your area, the cost implications, and the maintenance requirements. By carefully considering all of these factors, you can choose the best roof type for your home that will provide the best protection from the weather and last for many years.

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