![]() If there is a problem with the boards, unfortunately it is a possibility the boards will have to be re-installed correctly. New resin should be applied by an accredited GRP roofing specialist. Once the area which is suffering from cracking is removed. If a roof is suffering from cracking due to a problem with the top coat, the best thing to do is to cut out and replace the affected area. We go into more detail about this later in this article.Īnother reason for cracking is if the top coat of GRP resin was applied to quickly or on top of the laminate whilst still wet. Due to the rigidity of GRP systems OSB boarding ( 2) should be used. As this process repeats pressure is put on the GRP surface and cracks will eventually form due to no movement being allowed for in the boards underneath.Ĭracks can also appear in the surface of a GRP roof if the incorrect timber boarding is used. As the roof is exposed to changes in temperature such as during the day in summer and then the cooling down during the night. The reason for this is due to thermal movement. If this is not the case cracks will occur in the surface of the GRP flat roof. This rigidity means there must be room let between the perimeter edges and the timber boards. Most GRP systems are very rigid, with the exception of UltraFlex ( 1). The most common reason for a GRP roof to suffer from cracking is because of a poor installation. The roof will either have a typical crack going through it or a flaking effect. Cracks In Fibreglass RoofĬracking on a fibreglass roof in most cases can be identified from the moment you look down on the flat roof. Once this resin has been applied correctly the pinholes will be sealed and no water ingress will occur through this part of the GRP roof. Although this sounds straight forward is important both the correct mixture of GRP resin is prepared and the resin is applied in the correct quantity. The contractor will apply fresh resin to your roof to fill the pinholes. ![]() It is recommended you hire a professional flat roofing contractor with expertise in fibreglass roofing systems to do this to prevent any further problems with your roof. Thankfully if your GRP flat roof is suffering from pinholes it is possible to fix it. During these times water ingress is likely to occur. The time when a roof with pinholes is especially vulnerable is when there is heavy rain and high winds. These pinholes can lead to the development of leaks which have the potential to cause significant damage. Although it may seem as though such small holes could lead to no damage to the roof, in fact they can. The reason this problem develops is because not enough top coat resin has been applied during the installation of the flat roof. As the name suggests this problem resembles the roof having been pierced repeatedly by a pin. But upon close inspection pinholes on a fibreglass flat roof are unmistakable. It is hard to identify pinholes from afar.
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