Epoxy Water Vapour Barrier
Boscoseal 21 is a surface applied material which waterproofs and protects concrete in-depth. It provides a deep seal penetration and permanent protection against fresh and salt water under pressure. It consists of Portland Cement, specially treated quartz sand and a compound of active chemicals.
When Boscoseal 21 is applied to a concrete surface, the active chemicals combine with the free lime and moisture present in the capillary track, to form insoluble crystalline complexes. This is known as crystallisation processs. Once the crystals have been formed, they remain permanent. These crystals block the capillaries and minor shrinkage cracks in the concrete to prevent any further water ingress. However, the layer will still allow the passage of water vapour through the structure (i.e: the concrete will still be able to "breathe").
Further contact with water will reactivate the sealing process. Thus the lower depths of the concrete form an intergral mass with the surface, which cannot be blown off by hydrostatic pressure. In addtion to waterproofing the structure, Boscoseal 21 protects concrete against sea water, waste water, aggressive ground water and certain chemical solutions.