Torch-On Bitumen Systems

Flat Roof Waterproofing | Flat Roof Repair-

Once applied, Sika’s bituminous 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.

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

mineral torch on.jpg
Mineral ( Stone Chip)

Box Gutter - Bitumen

Repair & Waterproofing

The box gutter leak is and can be depending on the size and type, one of the most costly repairs for any business or factory roof leak scenario.

What we offer, is a solution catered to the immediate leak solution before the dreaded replacement is a need. As torch on is so pliable and generally easy to work this enables a total torch solution for the gutter.

Whether there are rust spots or just a decaying box gutter we will fit plates where necessary treat rust and then torch on. 

Is this the ultimate solution, no. What this does though is give the client a dry solution that is financially viable and then from the clients point of view a financial solution to replacement can then be planned.


The bituminous waterproofing membranes are unfolded on the site and laid firmly on the surface with tar-based adhesives using blowtorches.


A layer of bituminous waterproof membrane is laid over the structural roof which acts as a shield against the seepage of water onto the roof. Roof tiles & membrane is applied over the filler material laid to slope to pass the flow of water into drains. A proper slope is necessary to allow the water to flow steadily to drains.

These membranes have 2 to 4 mm thick waterproof materials. The membrane should be flexible with elongation 150 % to cover any small cracks, strong, chemical & UV resistant, flexible enough to take any shape over which it is laid.



Screeds are to be sand cement laid to minimum falls of 1 in 60, the strength and thickness as per engineers specification. The moisture content is not to exceed 7 % prior to torchon applications.

Should lightweight screeds be employed an additional sand cement screed is to be placed on top of the lightweight screed, the strength, and thickness as per engineers' specifications.

Under no circumstances must the torchon material be applied directly onto the lightweight screeds. Special care must be given to all expansion/construction joints, refer to you’re a.b.e.® Technical Representative concerned for specific details.


Surface areas should be dry, clean and sound, free of voids, sharp protrusions or contaminants. The surfaces shall have a light steel trowelled or fine wood float finish.

    Prime all surfaces with bitu.® prime, including all verges, and around outlets and protrusions and allow the solvent to flash off. Extremely porous surfaces should be re-primed

    Strip existing waterproofing before priming all surfaces with bitu.® prime, including all verges, around outlets and protrusions and allow the solvent to flash off.
    Some existing waterproofing materials may be overlaid only in consultation with the a.b.e.® Technical Representative concerned