Hydrotite is a premium grade hydrophilic water-stop designed for water sealing. It is designed to expand and swell in water and will fill concrete gaps, conforming to the shape and variation of the gap for a tight seal. It’s great for keeping things water tight and is most often used for applications such as sewers treatment plans, train stations, pipe penetrations, swimming pools, basements and underground spaces and in reservoirs. It’s based on hydrophilic technology and can swell to much more than its usual size when it absorbs water.
The hydrotite products are excellent because they are self-adhesive, for easier install and involve a co-extruded design which means that the expansion happens across the joint for a better seal. They also have a delay coating on them which helps to stop them from expanding prematurely. The product can manage multiple wet and dry cycles and is made from non-toxic materials. It can also be applied to rough surfaces and joined with traditional PVC water-stops.
When it is installed correctly Hydrotite can seal water up to 50m and is often used by the construction industry for horizontal seals. To learn how to install it, read on below.
Tips for installing
Before installing Hydrotite make sure you have a clean, smooth surface. That means that there should be no dust, debris, grease or oils. Grout up any air holes or gaps that are wider or deeper than 4-5mm in depth. The product require at least 50mm cover of concrete from reinforced concrete, or 100mm cover from un-reinforced concrete to properly accommodate the swelling from expansion.
To join Hydrotite, simply push butt joints firmly together. All you need to do is cut the ends of the product square with scissors or a sharp knife. A little bit of Leakmaster across the joints can stop any leaking and helps to ensure that the structure is water tight. It is not recommended that you nail Hydrotite as this can cause it to become stretch and can cause concrete slurry to congregate under the seal. Leave 100mm tail on the Hydrotite to allow for butt joining. If you have any 90 degree angles, the product should be cut and butt joined, instead of being pulled around the corners as this can cause voids to form on the corners of your structure. To avoid pre-expansion before you install, make sure the product is kept away from moisture. If the product has had water exposure, check for expansion. The product will turn from dark blue to lighter blue when it has been exposed to water which shows installers visually when there’s a problem and the product has pre-expanded.
If the product has come into contact with moisture or water and has expanded, remove it and replace it with unexpanded material. When dried the expanded piece will return to it’s normal size and can be used again without losing any of it’s normal properties.
The product comes with adhesives or without. If installing it with adhesive, peel off the protective backing paper and press it onto the concrete surface until it bonds with the concrete, put leak master over any joins. If it’s the non-adhesive type then you should use a solvent that can be brushed onto the concrete before putting the product on the concrete for a great bond. Use Leakmaster on any joins. If you’re installing onto hard surfaces, use a caulking gun and try to smooth out the surface and then place the product with Leakmaster If you’re installing it vertically, use concrete nails to secure it properly in place with Leakmaster.