bitumikermistä

Bitumikermi is a roofing material commonly used in Finland and other Nordic countries. It is a type of roll roofing manufactured from a base material, typically glass fiber or polyester felt, which is then saturated and coated with bitumen. The bitumen is a viscous, black, and sticky petroleum byproduct that provides waterproofing and durability.

The surface of bitumikermi is often protected with mineral granules. These granules serve multiple purposes: they reflect sunlight, which helps to reduce the temperature of the roof surface, and they protect the bitumen from UV degradation, thus extending the material's lifespan. Different colors of granules are available, allowing for aesthetic customization of the roof.

Bitumikermi is typically installed by applying heat, often with a torch, to melt the bitumen layer on the underside of the roll and the surface of the roof deck or previous layer. This heat-activated adhesive creates a strong, continuous, and watertight bond. It can be used on various roof slopes, but is particularly well-suited for low-slope or flat roofs where traditional shingles might not be effective. Installation requires careful attention to detail to ensure proper overlap and sealing of seams, which are critical for preventing water penetration. Bitumikermi is known for its cost-effectiveness and good performance in harsh weather conditions, making it a popular choice for residential and commercial buildings.