Kerabit LESSNOX is a torchable multi-layer top membrane for multiple roofing that breaks up the hazardous nitric oxides.

The carrier consists of polyester felting. The bottom surface of the product is coated with torch-on modified bitumen and the top surface with light grey slate.
This product can be used as the top membrane of a multi-layer membrane.

See the LESSNOX-video (texts in Finnish) >



Manufacturer / Manufactured for
Nordic Waterproofing Oy, Lohja plant
Country of origin
Conformity marking
Reaction to fire
Manufacturer’s fire testing certificate
Fire Classification


Manufacturer’s declaration of conformity
Kerabit modified bitumen roofing materials
Quality control
Quality control agreement between the Plant and Eurofins Expert Services Oy
Nominal thickness
n. 4,4 mm
Nominal weight
5000 kg/m²
Weight of the supportive layer
170 g/m² (+/- 10 g/m²)
Supportive layer
Surface type

Light grey LESSNOX® slate

Rolls size
1 x 8 m / 8 m²
Light grey
Packages / pallet
24 rolls
Weight / package
40 kg
Weight / pallet
985 kg


This product can be used as a top membrane of a multi-layer roofing.

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.