Kerabit 3300 UTL Nature

The low-carbon status of Kerabit Nature® products is achieved, among other things, by replacing part of the traditional raw materials with renewable and recycled raw materials.The carbon emissions (GWPtotal) during the manufacture of Kerabit Nature products are approximately 59 % lower than for corresponding basic products. Apart from environmental impact, the characteristics of the products correspond to the analogous basic products. We are especially careful about the waterproofing properties – we don’t compromise on them!

Kerabit 3300 UTL Nature 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.