Before starting the application process of waterproofing treatment, we identified the construction joints, cracks and damage to surface integrity etc. We carry out all the necessary rectification and preparatory works before the installation of waterproofing system and we ensure that the area where waterproofing system needs to be install shall made free from all other activities that could disrupt. The methodology, which we commonly followed for doing waterproofing job are as under:
Cleaning and removing of loosely adhering particles, dust etc. with wire brush/blower/ high pressure water jet wash and made free from any other contaminants (if any).
Surface shall be prepared by providing of 10-12mm thick plaster admixed with waterproofing admixture for making smooth finish to receive the waterproofing properly after casting of PCC, if required in horizontal surface.
In vertical surface, the identified construction joints shall be treated by opening grooves in 20 x 20 mm and sealing the same with ready to use repair mortar or polymer modified mortar.
Grouting operation shall be done after fixing of 12mm dia GI/NMBS half the depth of the concrete at a distance @ .75 to 1.0 Mtr C/c along the construction joints and other areas approx. 1.0 to 1.5 Mtr C/c with non-shrink free flow expanding grouting admixture.
To stop the ingress of water from the peripheral gaps between pipes and concrete/ brick masonry work shall be treat with a moisture insensitive, saline resistantand corrosion resistant epoxy putty followed by cement sand grout highly enriched with polymer emulsion.
Choice of waterproofing systems is depends on various aspects such as requirement of site, locations, applicability of products, flexible to movement, durability and combination of layers etc.
For better strength and reinforcement to waterproofing layers it is recommend that a suitable woven fiber mesh of 45-60 GSM shall be placed between the layers except vertical surface.
Waterproofing systemsshall be further covered with plaster admixed with integral waterproofing compound after applying a bond coat.
The food grade epoxy based (weather, oil, grease and mild dew resistant) layers shall be applied on entire surface.