Kattohuovan

Kattohuovan is a Finnish term referring to roofing felt, a common building material used for waterproofing roofs. It is typically made from a base material, such as fiberglass or polyester, which is then saturated with bitumen (asphalt) or a similar petroleum-based compound. This saturation process gives the felt its water-resistant properties.

Kattohuovan is often used as an underlayment beneath more durable roofing materials like shingles, metal roofing, or tiles. Its primary function is to provide an extra layer of protection against water penetration, preventing leaks and protecting the underlying roof structure from moisture damage. It can also be used as a standalone roofing material on certain types of structures, particularly those with low slopes or flat roofs, though it is often reinforced or covered with a protective coating for increased durability and UV resistance.

The installation of kattohuovan usually involves rolling out the felt over the roof deck and securing it with nails or adhesive. Seams between adjacent pieces are overlapped and sealed to ensure a continuous waterproof barrier. The specific type and thickness of kattohuovan used can vary depending on the climate, the type of roofing system, and local building codes. Its cost-effectiveness and ease of installation have made it a popular choice for many roofing applications.