After 10 years in the roof-coating industry and involvement in thousands of roof repairs, we’ve learned an important lesson: not all roof coatings are created equal—and many roofs that are being considered for replacement can actually be restored.
When we first became involved with roof coatings, we saw a recurring problem. Products were being used to repair and restore roofs, particularly flat roofs, only to fail after a relatively short period. The result was frustrating for everyone involved—more labour, more materials, more expense and, in many cases, the need to coat the roof all over again.
Our own experience eventually led us to look beyond the products that were readily available locally and investigate premium silicone roof coatings from the United States.
What we have learned since has fundamentally changed our view of roof restoration and roof repair.
We Didn’t Simply Believe the Claims—we Tested the Product Ourselves
We had already used two roof-coating products that failed after a relatively short period. That experience made us cautious about manufacturers’ claims.
When we first came across Eterna-Kote and APOC, we were impressed by the reputation of the manufacturers, the product specifications, the warranties and the track record of the products.
But we didn’t simply take the claims at face value.
We applied Eterna-Kote to the flat roof of our own house.
The results were exceptional.
That gave us the confidence to start recommending the product to customers. Ten years later, and after involvement with thousands of roof repairs, our experience has continued to reinforce our original decision.
What We’ve Learned From Thousands of Roof Repairs
Over the years, we have been involved with roof repairs and restoration across a wide range of substrates and applications, including:
- Butynol roofs and gutters
- Bitumen and modified bitumen
- Torch-on membranes
- Metal roofs
- Concrete
- Existing roof coatings
- Motorhome and campervan roofs
- Other roof surfaces where the existing substrate is suitable for restoration
One of the most important things we have learned is that the condition of the existing roof is critical.
A roof coating isn’t a magic solution for a structurally unsound roof. If the underlying roof has reached the point where the substrate itself needs replacing, we will tell the customer that re-roofing is the appropriate option.
But where the existing substrate is fundamentally sound, we have repeatedly seen roof restoration provide an excellent alternative to replacement.
In fact, based on our experience with thousands of roof repairs, we estimate that around 9 out of 10 roofs we encounter that are being considered for replacement could potentially be restored with the right roof-coating system, provided the underlying substrate is sound and suitable for restoration.
That doesn’t mean every roof should be coated. Structural condition, substrate integrity, drainage, existing damage and the suitability of the coating all need to be assessed.
But it does mean that re-roofing should not automatically be assumed to be the only option.
Why the Roof Coating Itself Matters
One of the biggest differences we have seen between roof coatings is what is actually in the product.
The word “silicone” on a label doesn’t necessarily tell you everything you need to know about the formulation or expected performance.
In our experience, flexibility and longevity are critical.
A roof is constantly moving. It expands and contracts as temperatures change, and the coating needs to accommodate that movement without cracking, peeling or losing its waterproofing performance.
This is one reason we place so much importance on the formulation and technical specifications of a roof coating.
We have seen first-hand what can happen when inferior or unsuitable coatings are used and subsequently fail.
The coating needs to be selected for the roof—not simply because it is marketed as a roof coating.
Not All Products Marketed as “100% Silicone” Are the Same
This is one of the areas we believe consumers need to understand better.
The term “100% silicone” can be used to describe the type of coating technology, but it should not automatically be interpreted to mean that 100% of the wet product consists of silicone polymer.
Roof coatings contain different ingredients that perform different functions, including silicone polymers, fillers, pigments, reinforcing materials, adhesion promoters and other additives.
Historical technical documentation for GE Enduris 3500 illustrates why it is important to look beyond the marketing terminology.
A historical GE-related technical document identifies dimethylsiloxane at 15–35% by weight, together with calcium carbonate at 20–65% by weight and other ingredients. Historical Enduris 3500 safety data sheets also identify calcium carbonate at 20–<50% by weight.
The current product is still marketed as a “100% Silicone Roof Coating.”
We are not suggesting that the terminology necessarily means the manufacturer is claiming that every ingredient in the wet coating is silicone polymer. Rather, the point is that consumers need to understand what “100% silicone” actually means when comparing products.
This is why we recommend looking beyond the words on the label.
Look at the SDS.
Look at the technical data sheet.
Look at the formulation information that is available.
Look at the performance specifications.
And compare products on the basis of what is actually documented—not simply how they are marketed.
Why Formulation Matters in the Real World
For us, this isn’t simply a theoretical issue.
We have spent 10 years dealing with roof coatings and have seen the consequences when products fail prematurely.
We believe that the formulation of a coating has a major influence on its properties, including:
- Flexibility
- Waterproofing performance
- Adhesion
- Resistance to weathering
- Resistance to ponding water
- Durability
- Ability to accommodate substrate movement
- Long-term performance
This is why we encourage building owners and contractors to compare the actual technical specifications of products rather than simply comparing the names on the containers.
Ponding Water Is One of the Biggest Tests for a Flat-Roof Coating
If you have a flat roof, ponding water is an issue that cannot simply be ignored.
We have seen many situations where coatings that were not suitable for permanent ponding water have failed.
That’s why we consider the ability to withstand ponding water one of the most important characteristics when selecting a coating for a flat roof.
There is an important distinction, however.
Ponding water can also indicate drainage or structural problems, and excessive water can place additional loading on a roof. A coating should never be used as a substitute for addressing a structurally defective roof.
Our approach is simple:
Assess the existing roof first, then determine whether restoration is appropriate.
Roof Restoration Can Be a Very Different Proposition From Re-roofing
Over the years, we have spoken to many customers who initially believed their only option was to replace their roof.
Once they discovered the possibility of restoring the existing roof, many were extremely happy with the results.
The financial difference can be substantial.
Based on our experience, in appropriate situations roof coating can cost around one-fifth of the cost of re-roofing. On larger commercial projects, we have seen potential savings amounting to hundreds of thousands of dollars.
But the financial saving isn’t the only benefit.
Roof restoration can also mean:
- Less disruption to occupants or a business
- Less labour
- Less waste going to landfill
- No need to remove an otherwise serviceable existing roof
- Faster completion
- Less disruption to the building
- Potential energy benefits from a reflective cool-roof coating
For commercial buildings in particular, avoiding a major roof replacement can be extremely valuable. A business may be able to continue operating with considerably less disruption while the existing roof is restored.
Why We Don’t Think Every Roof Needs to Be Replaced
This is one of the biggest lessons we have learned over the past 10 years.
A roof that looks old does not necessarily need to be replaced.
In our experience, many roofs are being considered for replacement when the existing substrate is still capable of being restored.
We estimate that around 9 out of 10 roofs we deal with that are being considered for replacement may be suitable for coating restoration, provided the underlying roof is structurally sound and the correct preparation and coating system are used.
The key phrase is “provided the underlying roof is sound.”
We would not recommend coating a structurally unsound roof.
But where the substrate is sound, we believe restoration should always be investigated before a building owner commits to the cost and disruption of a complete re-roof.
One of the Biggest Mistakes We See Is Using the Wrong Product
After 10 years in this industry, one of the biggest mistakes we see is surprisingly simple:
The wrong product is being used for the roof.
A coating may look fantastic when it is first applied. That doesn’t necessarily mean it is the right long-term solution.
We have seen coatings fail after being used in applications for which they were not suitable.
For example, a product that performs adequately on a pitched surface may not be appropriate for a flat roof with permanent ponding water.
This is why we don’t believe in simply selling someone a bucket of coating and telling them to paint it on.
The first question should always be:
Is this product actually suitable for this roof?
What We’ve Learned About Australasia’s UV Conditions
We frequently hear that roof coatings need to be specially formulated for Australasia because our UV exposure is exceptionally high.
Australasia does experience relatively high UV compared with similar latitudes in the Northern Hemisphere. However, that doesn’t mean it has the highest UV exposure in the world.
Our experience is that premium silicone roof coatings perform extremely well in Australasian conditions, despite the fact that these products are also used internationally in climates that can experience substantially higher UV exposure.
UV isn’t the only factor affecting the life of a roof coating. Temperature changes, moisture, rainfall, humidity, substrate movement and application quality can all affect performance.
The important question isn’t simply whether a product can handle Australasia. The question is whether the product is proven and suitable for the conditions in which it will be used. For more information about our UV, visit NIWA Scientist Dr Richard McKenzie’s article.
A Premium Roof Coating Isn’t Just About Waterproofing
Another benefit that is often overlooked is the reflective nature of white silicone roof coatings.
A bright white roof can reflect a significant amount of solar radiation, helping keep the roof surface cooler.
For commercial buildings, this means the decision to restore a roof can potentially provide benefits beyond simply stopping leaks.
A reflective roof coating can contribute to a cool-roof system, potentially reducing heat absorption and cooling demand depending on the building, climate, insulation and other factors.
What Would We Tell a Building Owner Considering a Re-roof?
Do your homework before you replace your roof.
A roof replacement is a significant investment. Before committing to it, compare all the available options.
Consider:
- The condition of the existing substrate
- Whether the roof can be restored
- The expected life of the proposed replacement
- The cost of removal and disposal
- Labour
- Business disruption
- Building occupant disruption
- Waste
- The possibility of roof restoration
- The warranty provided
- The actual performance characteristics of the coating or roofing system
And don’t rely solely on a salesperson’s claims.
Read independent information. Look at reviews. Examine the warranty. Ask questions.
Most importantly, make sure you understand why a particular solution has been recommended.
When Should You Replace a Roof Rather Than Coat It?
This is an important question, and our answer is straightforward.
If the existing roof is structurally unsound, we would not recommend coating it simply to avoid replacement.
A roof coating cannot repair structural failure.
However, when the existing substrate is sound and suitable for restoration, we believe a premium silicone roof coating can be an excellent alternative to re-roofing.
Every roof needs to be assessed on its own condition.
What We’ve Learned After 10 Years in the Industry
We didn’t enter the roof-coating market simply because we wanted another product to sell.
We entered it because we had experienced failures ourselves and were looking for a better solution.
We wanted to provide premium roof coating products that were genuinely fit for purpose, backed by reputable manufacturers and strong warranties.
After 10 years and involvement with thousands of roof repairs, we remain convinced that premium silicone roof coatings can provide an excellent alternative to re-roofing when the existing roof is suitable for restoration.
Our experience has also taught us that building owners should not automatically assume that an old or leaking roof needs to be replaced.
In our experience, around 9 out of 10 roofs we encounter that are being considered for replacement may be capable of restoration when the underlying substrate is sound and a suitable coating system is used.
We also believe consumers need better information.
There are good roof coatings and there are coatings that may not be suitable for the job. There are good contractors and there is poor workmanship. And there are roofs that should be restored and roofs that genuinely need to be replaced.
Our philosophy is simple: don’t automatically replace a roof before you investigate whether it can be restored. Do your homework, compare the alternatives and choose a product that is genuinely fit for the application.
That’s what we have learned after 10 years in the industry—and it’s why we continue to recommend premium silicone roof restoration where we believe it is the right solution.
Frequently Asked Questions About Roof Coatings
Can most roofs be restored instead of replaced?
In our experience, many roofs that are being considered for replacement can be restored if the existing substrate remains structurally sound. Based on the thousands of roof repairs we have been involved with, we estimate that approximately 9 out of 10 roofs we encounter may be suitable for restoration, subject to proper assessment.
Is roof coating a good alternative to re-roofing?
It can be, provided the existing roof substrate is structurally sound and suitable for restoration. A premium roof coating can restore waterproofing without the cost and disruption of completely removing and replacing an otherwise serviceable roof.
Can silicone roof coating be used on a flat roof?
Yes, silicone roof coatings are commonly used for flat and low-slope roofs. However, the particular product must be suitable for the roof substrate and its conditions, including any areas of ponding water.
Can silicone roof coating stop a leaking roof?
A properly selected and correctly applied roof coating can restore waterproofing and seal suitable roof surfaces, but the existing roof must first be properly assessed and prepared. Structural problems and significant substrate failure cannot simply be coated over.
Can silicone roof coating be applied over Butynol?
It can be suitable for Butynol roofs where the existing membrane is sound and properly prepared. Compatibility, preparation and application are critical, so the specific roof should be assessed before coating.
How much cheaper is roof restoration than re-roofing?
The saving varies considerably depending on the roof, its condition, access, labour and the replacement system being considered. Based on our experience, suitable roof restoration projects can cost around one-fifth of a complete re-roof, with substantially greater savings possible on some large commercial projects.
What does “100% silicone” mean on a roof coating?
The term can refer to the coating technology or resin type rather than meaning that every ingredient in the wet coating is silicone polymer. Different silicone roof coatings can contain different proportions of silicone polymers, fillers, pigments and other ingredients. This is why we recommend examining the technical data sheet and SDS rather than relying solely on the words “100% silicone” on the label.
Does ponding water damage roof coatings?
It depends on the coating. Some roof coatings are not designed for permanent ponding water and may fail when continuously exposed to standing water. For flat roofs, we consider ponding-water resistance an important factor when selecting a coating.
When should I re-roof instead of using roof coating?
If the roof is structurally unsound, the existing substrate has failed or the roof cannot provide a suitable foundation for restoration, replacement may be the better option. Roof coating should not be used to disguise structural failure.
What should I check before buying a roof coating?
Look at the technical data sheet, SDS, warranty, substrate compatibility, ponding-water suitability, application requirements, expected performance and independent customer experiences. Don’t choose a coating solely because the words “100% silicone” appear on the label.
Is roof restoration better for the environment than re-roofing?
Where an existing roof can be successfully restored, roof restoration can reduce the need to remove and dispose of existing roofing materials. It can also reduce the amount of new material required compared with a complete roof replacement.
Our Advice: Investigate Restoration Before You Replace
If you’re told that your roof needs replacing, don’t automatically assume that re-roofing is your only option.
Have the existing roof properly assessed.
If the substrate is sound, ask whether a professional roof restoration system could provide a longer-lasting and more economical alternative.
After 10 years and thousands of roof repairs, this is one of the biggest lessons we can share:
A roof that looks old does not necessarily need to be replaced.
Sometimes it needs to be restored.
About Us
We have been involved in roof coatings and roof restoration in Australasia for 10 years, with experience across thousands of roof repair projects.
Our focus is on supplying premium roof coating products that are fit for purpose and suitable for the application—not simply selling a coating because someone wants a cheaper solution.
We encourage every building owner to do their homework, compare alternatives and understand the product and warranty before making a major roofing investment.
If you have any questions, please feel free to contact us