Damage to the glass reinforced polyester can manifest in various types of ways.
To repair the roof the same resin used in the original construction of the fibreglass needs to be used. Matching all repairs as closely to the original build is important as this will act as a secondary bond.
GRP roof cracking usually happens when the fibreglass hasn’t been installed properly. A fibreglass roof can heat up during the summer, this can cause the roof to expand. Then in the evening once it’s cooled down the roof contracts. This is known as thermal expansion and causes the GRP to crack open.
This is due to the roof not being installed without enough space between the perimeter edges and the board.
When a GRP roofing system as reached the end of its lifespan, fibreglass starts to lose it’s elasticity. Once this happens the roof will look shrivelled and cracked. The only solution for this is to replace the fibreglass roof.
Pin holes are small holes on the surface of the GRP roof. This occurs when there hasn’t been enough topcoat added to the roof during construction. When these holes are left alone it can cause water to get stuck and cause leaks.
To fix the holes in a GRP flat roof, fresh resin needs to be applied. This will seal them to stop any further damage.