Painolevyjärjestelmä

Painolevyjärjestelmä refers to a type of roofing system that utilizes ballast to hold the roofing membrane in place. This ballast is typically made of materials like gravel, pavers, or vegetation. The weight of the ballast provides resistance against wind uplift, which is a primary concern for flat or low-sloped roofs.

The fundamental principle behind a painolevyjärjestelmä is that the mass of the ballast overcomes the lifting forces exerted by wind. This eliminates the need for extensive mechanical fastening of the roofing membrane directly to the roof deck, which can be a source of potential leaks. The ballast also offers protection to the underlying membrane from UV radiation, extreme temperature fluctuations, and physical damage.

There are several common types of painolevyjärjestelmä. Extensive green roofs, for instance, feature a shallow layer of soil and drought-tolerant vegetation. Intensive green roofs have a deeper soil profile and can support a wider variety of plant life, even small trees. Gravel ballast roofs are a more traditional and cost-effective option. Paver systems involve laying decorative or functional pavers over the roofing membrane, often used on accessible rooftops like balconies or patios.

The installation of a painolevyjärjestelmä requires careful consideration of the roof's structural capacity, as the ballast adds significant weight. Proper drainage is also crucial, especially for green roof systems, to prevent waterlogging and hydrostatic pressure. Despite the weight consideration, painolevyjärjestelmä are valued for their durability, longevity, and the added benefits they can provide, such as improved insulation, stormwater management, and aesthetic appeal.