Points to be Remember while Waterproofing Water Holding Structures

Fixed and portable tanks, reservoirs, filtration plants, water features and ponds are some typical structures that hold water. These water holding structures are subject to pressing water exposure constantly, particularly when they’re built as part of a new building, using standard building materials such as concrete and concrete block-work. Applying a waterproofing membrane to these areas is therefore crucial, especially underground tanks where detecting and repairing leaks is more challenging and expensive.

Most of the water holding structures are made of concrete or precast built which, over time undergoes shrinkage which leads to cracks in the substrate and subsequent leakage. Durotech has available a range of materials suitable for waterproofing tanks and water holding structures for a variety of purposes including water retention, potable (drinking) water and chemical resistance. There are some other points to be considered prior to waterproofing, please see below;

1.       It is critical to establish exactly what is required of the waterproofing membrane system before waterproofing, to ensure the correct procedure and products are used. For example, it must be identified if there’s any Hydrostatic resistance required, potable water certification or chemical resistance, UV exposure and fish among other factors because this will affect which membrane is most applicable to each given circumstance.

2.       Ensure all protective equipment/breathing apparatus is used, particularly in situations with limited ventilation.

3.       In case of underground tanks, partially buried tanks or marine tanks, it is important that the tank be treated from both in inside and outside (in much the same way as a retaining wall). The internal waterproofing will ensure that all water inside the tank remains inside the tank. External waterproofing is critical to ensure that no moisture can enter the tank from outside, which would create issues with the quality of water as well as creating hydrostatic or negative pressure which can push the membrane off the inside of the tank as the pressure builds up over time.

4.       The surface of the water structure should be dry and free of all contaminants prior to installation of system.

5.       Finally, it is recommended that a test are be waterproofed first, to ensure adequate adhesion of both the primer to the substrate, and the membrane to the primer. Please contact Durotech, or consult the Technical Data Sheets for products to be used for waterproofing inside & outside tanks and other water holding structures.