Underlay felt Rankka 60 m² – condensation-protected underlay covering

Aluskate Rankka is a premium-class condensation-protected underlayment developed for demanding Nordic conditions. The product consists of a five-layer laminate where the foundation is an HDPE mesh that provides excellent mechanical strength and dimensional stability.

Above the mesh is a waterproof polyethylene layer with sanded surface treatment for increased slip resistance and secure installation on sloped roofs. Beneath this is a highly absorbent fiber fabric layer that captures any condensation formed under the roof covering — eliminating the risk of droplet formation and allowing the under-roof to quickly ventilate moisture. 

Aluskate Rankka is delivered in the format 1.5 m × 40 m, providing a coverage area of 60 m² per roll. It is approved for roofs with metal or tile coverings, even in environments with high load and moisture exposure.

• Format: approx. 1.5 m × 40 m (covers 60 m²) 

• Construction: five-layer laminate – HDPE mesh + waterproof polyethylene + absorbent fiber fabric.

• Sanded surface treatment for increased slip resistance and secure installation on sloped roofs.

• Condensation management: integrated absorbent layer that prevents droplet formation.

• Application: Roof coverings with tile or metal in Nordic climate.