Bitumen, also known as asphalt, is a sticky, black and highly viscous liquid or semi-solid form of petroleum. Thanks to its waterproofing qualities, it is widely used in construction. Bituminous membranes are perfect for waterproofing roofs, basements, below-ground structures, bridges and other structures.

Explore our Range of Bitumen Waterproofing Products

Sika Index Bitumen Membranes

Once applied, torch-on bitumen membranes are a thin layer of watertight material fully-bonded to the surface. It is a flexible system, able to maintain its waterproof capacity without causing cracks.

See the general bituminous membrane build-up below.  

Bituminous waterproofing membrane

Main Uses

  • Retaining walls, basements and below-ground structures
  • Flat roofs under protective layers of ballast 
  • Balconies and terraces under tiles
  • Wet areas
  • Underground car parks
  • Bridges
  • Raft slabs and foundations
  • Protection of various substrates in a wide range of applications


  • Fully-bonded system
  • Resistant to the most extreme weather conditions
  • Ease of maintenance
  • Excellent mechanical properties
  • High resistance to mechanical damage and punctures

Bitumen LAM (Cold-applied, Liquid -applied Membrane)

Bitumen liquid-applied membranes are the perfect solution for seamless, fully-adhered and safe systems. They are polymer-modified bitumen emulsions which require no torch or flame to be applied. They are available as water-based or solvent-based coatings.

Application of cold-applied bitumen membrane with a hand trowel

Main Uses

  • Below-ground areas facing ground moisture, such as foundations  
  • Wet areas  
  • Swimming pools  
  • Renovation projects
  • Detailing
  • Typically used for residential and industrial buildings
  • As an adhesive to bond lightweight thermal insulation boards


  • No torch needed
  • Fully-bonded, seamless system
  • Crack-bridging capability
  • Safer, faster installation

Self-adhesive Bituminous Membranes

Self-adhesive bituminous membranes are covered by a release liner, which is removed during application.

Bituminous Membrane Basement from Outside

Main Uses

  • Wood substrates
  • Flammable areas
  • Small areas, vertical surfaces or those areas with difficult access
  • Retaining walls, basements and below-ground structures


  • No torch needed
  • Safer, faster installation
  • No special equipment needed
  • Excellent adhesion, even at low temperatures

Typical Application Fields

For Bitumen Roofs

Close up view of bitumen membrane applied on roof at parapet

Flat Roofs

Bitumen Terrace of Residence building in Muehlau Kirchgasse


Sika flooring system in parking garage Lammermarkt in Leiden Netherlands

Parking Levels

Comet hangar roof after renovation of bitumen roof

Pitched Roofs

Builiding with green roof in the mountains

Green Roofs

Two workers rolling SikaBit bitumen membrane apply on roof

Roof Renovation

For Bitumen Waterproofing

Bituminous Membrane Basement from Outside


Man applying bituminous membrane on a building basement

Below-Grade Structures

Application of bituminous membrane on a podium


Bridge in Klosters Switzerland

Bridge Decks

Waste water treatment plant in Wroclaw in Poland

Tank Lining

General Bituminous Membrane Build-Up

The combination of raw materials can be built up in thousands of possibilities, but this is a typical composition example.