This is also true of structural waterproofing. For what good is it if 99.9% of the roof is watertight, but rain gets into the building at one point? And usually the most expensive machine or most valuable piece of furniture is directly below this point! Only reliable waterproofing ensures long-term waterproofing success. Connections to penetrations, fixtures and rising structural components represent the biggest failure points on flat roofs and constitute the weak areas of the waterproofing. Traditional materials, such as bitumen sheeting or plastic roof sealing sheets frequently reach their limits here, leading to water ingress.