After releasing of the shuttering we inspect and ensure that the area where waterproofing system needs to be install shall made free from all other activities that could disrupt the installation of the system and also ensure that the substrates are free of cracks, protrusions and damage to surface integrity. We carry out all the necessary rectification and preparatory works before the installation of the specified waterproofing system. The methodology, which we commonly followed for doing waterproofing job are as under:
Cleaning and removing of loosely adhering particlesfrom the exterior underground surface with wire brush/blower/ high pressure water jet wash and made free from any other contaminants (if any).
Preparation of construction joints by opening in “V” shaped groove in 20 x 20 mm and 50 x 50 x 25 mm around the tile holes, further grooves and holes shall be filled 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 section 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 expanding grouting compound.
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. Before application, the surface should be SSD.
Coving of 50 x 50 mm at all the junctions between slab and wall in CC 1:2:4 with 12mm nominal size stone ballast, under the drip coarse finish with CM in 1:3 admixed with waterproofing admixture.
Installed waterproofing shall be further protected with 12-15mm thick plaster in CM 1:4 or other any suitable means.