AF Colorbond 

Colorbond roofing has been used as far back as 1966. While not immediately popular, by the 90’s it was one of the go to roofing materials. Now, with its low weight, clean lines and aesthetic appeal, it is arguably the most popular roofing choice for homeowners. Being lighter than tiles also improves the thermal aspects of a steel roof at night. The lower mass means that it will cool down more rapidly than tiles so will not radiate as much heat into the home after the sun goes down. It does, however, get much hotter than tiles do during daylight hours. Surface temperatures on a steel roof can exceed 120 degrees Celsius on hot days. That’s hot enough to cook on!

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Metal roofs also begin to rust over time. They are typically coated with secondary steels that resist rust better and Colorbond also has a powder coating incorporated into it. These protective coatings wear off over the years however and rust then inevitably ensues. Once the roof begins to rust it will only survive for a few years before replacement becomes necessary.

Older Colorbond roofs, particularly those that were installed pre 2000, can fade and begin to look unsightly. Issues with a blue pigment in the late 80’s and through the 90’s has led to many blue and green roofs failing quite badly. Many also develop a striped appearance that detracts hugely from the aesthetics of the home.

The successful restoration of a steel roof is a highly specialised skill. Metal is not porous like timber or concrete tiles. Any coating will just sit on top of it, not penetrate in like other surfaces. The extreme heat fluctuations in steel also mean that expansion and contraction occurs much more frequently, and to a greater degree than in concrete tiles. Paint peels off as a result of this this expansion. Many companies will not agree to restore a metal roof, and many that do, have not completely considered the complexities involved. Thermaguard roof restoration have developed a unique roof restoration system that not only protects and preserves the beauty of your roof, it will  also significantly decrease the internal temperatures of your home saving you thousands in energy bills. With over 30 years experience we know what works and what doesn’t. We have perfected our techniques to the point that we can guarantee our metal roof restoration system for 10 years! Our claim? To provide you with a finished roof restoration system that is better than new! Please read on to see how we go about returning your roof to its former glory while also introducing important energy saving technology.

Our Process

Please read on to see how we go about returning your roof to its former glory while also introducing important energy saving technology.

1. Safety

All work on roofs require physical edge protection to be erected by law. Falls from roofs are amongst the most common workplace injury. If our tradespeople don’t feel safe, they also find it difficult to provide you with the high quality we demand. Prior to commencement of any of our roofing projects, full perimeter rail is erected around the roofline.

2. Roof fixture assessment and replacement

Roof screws often rust prematurely. If your Colorbond roof is over 20 years of age, it is possible that an incompatible steel was used in the screws. Old style galvanised screws react with Colorbond. Rust will occur and, as the screws fail, they will swell and irreparably damage the roof sheet. It is imperative that prior to restoration works the screws are carefully checked and rusted ones are replaced. Older galvanised roofs with nails securing the sheets should be fully refined using specialised roof screws prior to coating.

3. High pressure cleaning

Roof screws often rust prematurely. If your Colorbond roof is over 20 years of age, it is possible that an incompatible steel was used in the screws. Old style galvanised screws react with Colorbond. Rust will occur and, as the screws fail, they will swell and irreparably damage the roof sheet. It is imperative that prior to restoration works the screws are carefully checked and rusted ones are replaced. Older galvanised roofs with nails securing the sheets should be fully refined using specialised roof screws prior to coating.

4. Priming application

Thorough cleaning is vital for successful steel roof restorations. Getting perfect contact between the applied products and the steel surface is crucial for a long lasting finish. Dust and pollutants left behind are the number one reason for rapid failure, even when using sophisticated products. Thermal utilise commercial pressure cleaners that are capable of exerting in excess of 4,100 psi of pressure. This means that we can ensure a perfect clean without the use of cleaning agents or chemicals. Foreign chemicals can remain on the roofs surface and react with the subsequent membranes. They will also adversely affect your garden.

5. High solids colour coat

Our first colour coat is a very thick high grade acrylic membrane. Most roofs are pitched. Applying standard paints to them will mean the the paint will run down the roof slope resulting in an uneven finish. Our first colour coat is very dense (in excess of 40% solids or around three times thicker than a normal paint) with added emulsifiers to help it coagulate. It applies very evenly and, because of the very low water percentage, drys very rapidly also. When applied by an expert applicator, the end result is virtually indistinguishable from a brand new roof.

6. Heat reflective topcoat

Our first colour coat is a very thick high grade acrylic membrane. Most roofs are pitched. Applying standard paints to them will mean the the paint will run down the roof slope resulting in an uneven finish. Our first colour coat is very dense (in excess of 40% solids or around three times thicker than a normal paint) with added emulsifiers to help it coagulate. It applies very evenly and, because of the very low water percentage, drys very rapidly also. When applied by an expert applicator, the end result is virtually indistinguishable from a brand new roof.

Our metal roof restorations are much more than just a painted steel roof. The Specifically engineered compounds have been tailored to meet and exceed the harshest of Australian conditions. The combination of nano technology, molecular manipulation and infrared reflective pigments makes our coatings amongst the very best in the world today. Designed for durability and aesthetic enhancement, a steel roof restoration from Therma-Guard Roof Restoration will keep your home looking fantastic for many years.

Our metal roof restorations are much more than just a painted steel roof. The Specifically engineered compounds have been tailored to meet and exceed the harshest of Australian conditions. The combination of nano technology, molecular manipulation and infrared reflective pigments makes our coatings amongst the very best in the world today. Designed for durability and aesthetic enhancement, a steel roof restoration from AF Prestige Roof Restoration will keep your home looking fantastic for many years.

Frequently asked questions

Can I repaint my Colorbond roof?


Yes, but care is recommended. Firstly, it is not recommended to paint a Colorbond roof within the first 12 months of it being installed. The original coating is still to fresh for adequate adhesion of the subsequent coatings. Secondly, the correct primers and membranes are required to ensure that the finish lasts for a suitable period. If it is done by inexperienced tradespeople, peeling can occur. Once the roof begins to peel it is a very expensive procedure to have the peeling paint removed. Contact Therma-Guard Roof Restoration for an assessment and quotation on your upcoming metal roof restoration.




What is the best way to paint a steel or metal roof?


Professionally coating a metal roof is a specialised industry. Steel is much more difficult to paint because it has a smooth nonporous surface that reaches temperatures far in excess of timber or concrete. Most people associate peeling paint when they think of an old galvanised roof. This is because it has always been notoriously difficult to prevent peeling when applying paint to steel. The two most vital aspect of a long lasting steel roof restoration are the primer and the top coat. It is essential that the primer is exceptionally high In acetones to make it more adhesive than normal coatings. Secondly, the top coat must be able to reflect heat to minimise expansion of the paint. Expansion leads to peeling over time. If a more adhesive primer is used and then the coatings expansion is minimised by the application of a heat retardant coating, a professionally coated steel roof can last 15 years or more.




Can I paint over my rusted steel roof?


No. The rust must be completely removed prior to coating a metal roof. Many products claim to be able to convert rust or successfully encase it. Standards Australia have published material that refutes many of these claims. AS 2312:2002 states that in most cases only a change of colour occurs when a rust converter is applied. Rust inhibitors are great to prevent rust from occurring, but, according to their specifications, they must be applied to a rust free surface. Light, isolated areas of rust can be mechanically removed by hand. More extensive rust has to be removed by sand blasting. The cost of sand blasting added to the restoration cost often works out to be as much as a new roof. Heavy rust can not be removed at all without perforations occurring in the steel. Sadly, in most cases, it is too late once the roof begins to rust. No other viable recourse except replacement is available. Professionally coating the steel prior to rust occurring can prevent the roof from rusting for many decades.




How much does it cost to paint a Colorbond roof?


By the time roof scaffolding and high quality compounds are selected, the cost of steel roof restorations can be quite high. Even cheap paint jobs that do not have adequate primers consistently come in at over $5,000 for an average sized home. Low quality paints without good primers can also sometimes begin to peel within months of application. They may last as long as 5 years, but the yearly cost still works out to over $1,000 per annum. It is better to look at exceptional quality that will last for many years. Therma-Guard’s heat reflective technology can save an average household many thousands of dollars in energy costs over the life of the restoration. While initially more expensive, we generally work out to be around half the cost per annum once savings are factored in.




What should I do if my steel roof has peeling paint on it?


Unfortunately, nothing. If your roof restoration has gone south and begun to peel, their is not a lot that can be done to solve it without a very expensive sand blasting operation or full roof replacement. Applying new paint over the old paint is not a good idea. After all, the old paint is peeling because it was inadequately applied. If the new paint goes on over it, this paint will soon begin to peel off along with the faulty paint underneath. The original faulty paint would need to be entirely removed prior to repainting. This is hugely onerous if done by hand and sand blasting it off often costs in excess of 10K. It is better to either replace the roof or wait 5-10 years for the old paint to become powdery. When this happens, a nano primer can be applied after a vigorous clean that will the adhere adequately.




Why are my roof screws are rusting?


Older Colorbond roofs were often secured using galvanised screws. The older galvanised metal is not compatible with the new zinc and aluminium coated steel that is present in Colorbond roofs. A Galvanic Reaction occurs and the screws begin to rust. It is very important to have the screws replaced when this begins to occur. If the rusting is left to run its course, the screws will eventually swell and irreparably damage the roof sheets.




How long does it take to paint a Colorbond roof?


That depends on what type of job you are having done. Most of a day is required for the mandatory roof scaffolding or safety rails. Add another day to have them removed. After that, preparation works like re-screwing the roof or attending to faulty areas like damaged flashings will usually take another day. Cleaning or spraying will take half a day for each application. So in total, for a highly professional job, five days is usual for a medium sized home. Of course many companies attempt to do the work without safety rails and slap on one or two coats of paint without a thorough clean. This type of job could be done in a day or two, providing they don’t fall of the roof…





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