Kerabit 3300 UTL

Kerabit 3300 UTL is a line-torch-on underlay membrane in multi-layer membrane system.

The carrier consists of polyester. The underside of the product is coated with torch-applied bitumen, the top surface with sand.


Manufacturer / Manufactured for Kerabit Oy, Lohja plant
Country of origin Finland
Conformity marking CE
Reaction to fire Manifacturer´s declaration of the fire test
Fire Classification


Manufacturer’s declaration of conformity Kerabit modified bitumen roofing
Quality control Quality control carried out at the Plant quality control and a quality control agreement between the Plant and Eurofins Expert Services Oy
SFS-labeling K-TMS 170/3300 torch
Product category TL 2
Nominal thickness approx. 2,5 mm
Nominal weight 3300 g/m²
Weight of the supportive layer 170 g/m² (+/- 10 g/m²)
Supportive layer polyester
Surface type

sand granules

Rolls size 1 x 10 m / 10 m²
Packages / pallet 24 rll
Weight / package 33 kg
Weight / pallet 817 kg

Handling and storage 

Modified bitumen membranes are to be stored on pallets in a dry and cool place. Use a plastic hood or tarpaulin for protection. When the outdoor temperature exceeds +40°C, the rolls must be protected from sunlight.


This product can be used as an underlayer in multi-layer bitumen roofing or under discontinuous roofing as well as vapour barrier membrane.