A roof that cracks is not a good thing, and the new roof coatings that companies are now making for roofs are probably not a great idea.
The new coatings are supposed to make roofs less likely to crack, but the reality is that they will probably increase the risk of roofing-related damage.
In the case of this new coating, a team of Australian researchers tested two types of coatings on two different types of roofs: a flat roof that is covered with asphalt and a raised-to-the-surface asphalt roof that’s coated with concrete.
They found that both types of roof had more than double the crack rate of the standard roof coating.
The results are published in the Journal of Engineering Properties.
“A roof that has a high degree of protection against the weathering and abrasion processes of weathering, is the most susceptible to cracking,” says Professor Brian McAlister, a roofing materials expert at the University of Western Australia and one of the lead authors of the study.
“There’s a good reason why a flat-roofed roof will crack, and we’re finding that the new material is likely to do the same.
The best way to protect against it is to not use it at all.”
McAlisters team, led by Professor Michael Hulme, tested two different kinds of roof coatations for two different reasons.
They wanted to test whether the new coatants would be effective at keeping roofs from cracking.
In addition, they wanted to see whether they would be a good alternative to traditional roofing coatings.
“These new roof coating materials are not designed to withstand the stresses that would be experienced in the event of a roof cracking,” he says.
The research team did a controlled trial on three different types and conditions of roof, from the flat to the raised-surface.
The researchers found that the higher the quality, the better the results.
“In this trial, we found that we had a similar pattern of performance in all conditions and in all locations,” McAlians says.
“This is important, because it shows that we can find the coating that is most likely to be effective for the condition we are trying to achieve, and it will be the same for all conditions.”
McAllister says the researchers also used a special roof-covering material to test the new coating on different types.
“It’s the same material,” he said.
The roof coat is made of asphalt.
The coating is made up of three layers of materials.
First is the surface layer, made up mostly of a thin, hydrophobic layer.
This is a type of thin, porous material that allows water to pass through the roof, and also helps to absorb and remove water vapour.
The second layer is made out of a very thick hydrophilic layer, which makes up the entire roof, as well as the sides.
The last layer is a thin layer of polycarbonate that is the material that is used to protect the roof.
McAllisters team wanted to make sure that the hydrophilia layer of the roof coating did not affect the performance of the coating.
“It does have the effect of raising the crack resistance of the material, so it does provide a barrier to abrading,” he explains.
“However, we still do not know how much it actually does.”
He said the new design of the coatings is the same as the one used for the flat roof coating and is the only one available in Australia.
The next step for the researchers is to find out what happens to the new roofs if they were to be used for any other purpose, and how they would fare over time.
McAlisers team has now developed a new coat that is less likely for the material to break down under high stress conditions.
“We have also found that when the coat is applied to a raised surface roof, the crack barrier of the new layer is not reduced by the stress,” McAllisers says.
McClays says that the coat will likely continue to be available in the future.
“As soon as we can get the product approved and the manufacturers do get the products in the shop, we will start to sell the product,” he adds.
“The manufacturer of this product has also put in a request to do a test on the product and we will be happy to provide the results.”
For more information, read our in-depth article about roofing, or visit the Australian National University’s website.