Dual Seal Waterstop is a Bentonite based waterstop which reacts in contact with water by swelling to form a watertight seal in concrete structures. Dual Seal Waterstop has been independently tested up to 30 metre head of water, it has full WRAS approval for use with potable water.
Dual Seal Waterstop has been specifically designed to seal construction joints against the ingress or outgress of liquids in water retaining or excluding structures. Dual Seal Waterstop is fixed by nailing to the face of the existing pour prior to placing the next pour. It is installed directly onto scabbled surfaces and will swell into voids up to 12mm deep. Changes of direction and end joints are simply achieved by butting together, no welding or adhesives are required.
Dual Seal Waterstop can be applied to green concrete and in damp conditions.
7mm x 25mm – Supplied in 8 metre rolls.
| Physical Properties | Value | Test Method |
| Colour: Grey/White | ||
| Pliability: 180° bend over 2.5 cm mandral @ -32°C | 1000 | ASTM D146 |
| Tensile strength | 44.8N/mm2 | ASTM D412 |
| % Elongation – ultimate failure of membrane | 600% | D638 Type 4 |
| Resistance to water migration | No migration at 31 m head | |
| Water migration at or through joint | None | |
| Permeability through membrane | 0.001 Perm | |
| Installation Temperatures | -20°C to +60°C | |
| Operating Temperatures | -43°C to +132°C | |
| Life Expectancy | Longest life expectancy of all organic membranes | |
| Toxic/Staining | None | |
| Freeze/thaw and wet/dry cycles | No affect | |
| Cycling over 38mm joints | No deterioration 2000 cycles | |
| Salt Water Grade available for use when salt content exceeds 2000p.p.m. | ||
