Katusealustena

Katusealustena, often translated as roofing underlayment or felt, is a crucial component in a roofing system. It is typically a thin, flexible membrane installed directly onto the roof deck, beneath the primary roofing material such as shingles, tiles, or metal. Its primary function is to provide an additional layer of protection against water penetration. While the outer roofing material is designed to shed most of the water, the underlayment acts as a secondary defense, catching any moisture that might blow under the primary covering or seep through minor breaches.

This protective layer is especially important in preventing water damage to the roof deck and the interior of the building, particularly during heavy rain or snow events. It also serves to shield the roof deck from the elements during the construction phase, before the final roofing materials are installed. Different types of katusealustena exist, including asphalt-saturated felt, synthetic underlayments, and rubberized asphalt membranes. The choice of underlayment often depends on the climate, the type of primary roofing material, and building codes. Synthetic underlayments have gained popularity due to their lighter weight, greater tear resistance, and improved water-shedding capabilities compared to traditional felt. Proper installation of katusealustena is essential for its effectiveness, ensuring it is laid with appropriate overlap and securely fastened to the roof deck.