Twinseal Compound

Waterproof Sealing Compound

Product Documentation


Twinseal Compound is a trowellable, active sealing compound formulated using APAN™ technology, the latest Active Pre-Applied Nanoseal technology. It is designed for a variety of surface preparation and waterproofing sealing details for use with PREMCRETE Waterproof Membranes.

Its unique formulation ensures that the applied compound remains pliable and active for the lifetime of the structure to which it has been applied. When Twinseal Compound comes in contact with water it will swell to achieve a watertight seal. Its thixotropic consistency ensures ease of application to most substrates.


Twinseal Compound is suitable for use on structural concrete and masonry and other non-porous substrates. It is used for creating a waterproof seal around penetrations through Premcrete Waterproof Membranes, and other difficult junctions, where it is important to maintain the integrity of the membrane.

It is particularly suitable for sealing membranes to waterproof coatings where the use of lap tape is not suitable.

Next Steps

Share Product


  • Provides effective watertight seal at difficult junctions.
  • Remains active and will swell upon contact with water, to provide a watertight seal.
  • Produces effective seal between otherwise incompatible membranes.
  • Easily applied by trowel.

Related Case Studies

Civic Campus Scheme
Whittington Hospital
Bam Construction
Old Kent Road, London
Malt Street
Berkeley Homes