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Is Sarking Required Under Metal Roof?

Sarking is a layer of material that is installed between the roof deck and the metal roofing panels. Its purpose is to act as a barrier, protecting the roof deck from water and condensation.

While some people argue that sarking is essential in order to prevent water damage, others contend that it is not necessary and can actually do more harm than good.

So, what is the truth? Is sarking required under a metal roof? In this article, join Vertec as we look at who is a suitable candidate, weigh up the cost, and discuss what Australian building laws have to say about sarking under metal roofs in Australia.


Metal roofs are designed to shed water, meaning that they do not rely on an internal drainage system like shingled roofs do. This means that water is less likely to pool on a metal roof and cause problems. However, it is still possible for water to get under the roof panels and onto the roof deck if there are gaps or holes in the roof.

This is where sarking can help. By creating a barrier between the roof deck and the metal roofing panels, sarking can help to prevent water from getting through and causing damage.

how sarking under your metal roof can help protect your home


If you live in an area with high humidity levels, then sarking can be especially important. This is because condensation can form on the underside of metal roofs, and this can lead to water damage if it is not properly dealt with. Sarking can help to prevent condensation by providing a barrier between the roof deck and the metal roofing panels.


The two main types of roofing insulation are sarking and (traditional) insulation. Sarking is a layer of material that is installed under the roofing felt, while insulation is a layer of material that is installed between the rafters.

Sarking provides an extra layer of protection against moisture and wind damage, while insulation helps to keep the inside of your home cool in summer and warm in winter.

So, which does your roof need? The answer depends on a number of factors, including the climate you live in, the type of home you have, and your personal preferences.

If you live in an area with severe weather conditions, such as high winds or heavy rains, sarking is a good option. It will help to protect your roof from damage and will also keep the inside of your home more comfortable.

If you live in a milder climate, however, insulation may be the better option. It will help to keep your home cooler in the summer and warmer in the winter, which can save you money on your energy bills.

Ultimately, the decision of whether to use sarking or insulation is up to you. If you are not sure which is right for your home, consult with a roofing professional. They will be able to assess your needs and recommend the best solution for your situation.

sarking vs insulation - which is better under your metal roof?


So, is sarking required under metal roofing in NSW, or Australia?

No, Sarking is not a mandatory requirement under Australian building standards.

With that said, it is generally recommended in order to improve the thermal performance of a home and to prevent condensation from occurring within the roof space. Sarking also provides an additional layer of protection against wind-driven rain and debris.

How Long Does Metal Roof Sarking Last?

The average lifespan of metal roofing sarking is around 50 years. However, this will depend on the quality of the materials used and the installation process. If you are looking for a roofing material that will last for many years, metal roofing sarking is a great option.

Is Sarking Expensive?

Metal roof sarking is more expensive than traditional types of roofing insulation, but it can pay for itself over time in energy savings and increased home comfort. If you live in a climate with severe winters or summer heat waves, metal roof sarking may be worth the investment.


So, what is the verdict? Is sarking really necessary under a metal roof?

Ultimately, it depends on a variety of factors, including the climate in which you live and the design of your roof. However, if you are concerned about water damage, then sarking may be a good option for you. For more information on what might be most appropriate for your metal roofing, or for questions regarding leaking roof repair get in touch with the experts at Vertec today.

One Response

  1. Protecting home from water damage is crucial, and sarking under a metal roof can play a vital role. While metal roofs are designed to shed water, sarking acts as a barrier, preventing water from causing damage to the roof deck. For those seeking expertise not only in roof protecting but also in essay writing, is an excellent online service to ensure high-quality content. Their assistance was instrumental in producing numerous pieces of content for me on cutting-edge technology topics. And your professional website serves as an excellent illustration of effective content creation as well!

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