An underground sump containing two fire tanks, one pure water tank, and a pump room needed to be watertightened. As per the structural engineer’s requirements, we needed to water-tighten the internal sump before applying the waterproofing.

PREPARATION

First, we removed all the previous waterproofing materials from the concrete surface and found the concrete surface of the sump to be sound throughout. The construction joints had been previously treated with some materials, which we removed while applying the T cut on the vertical surface.

TREATMENT STARTED WITH QS 510 GG

h QUICSEAL 510 GG construction grout. All other prepared cracks were also treated with QS 510 GG. It was easy to repair those cracks with the gun-grade 510 because it adhered to the cuts properly.

1ST POND TEST – After preparing the construction joints with QS510 GG, the first pond test was conducted. However, when the tanks were being filled with water, it started leaking from outside the sump. At that point, we drained the water again and began identifying where the leak was occurring from inside the sump. We then discovered that water was seeping through the concrete walls of the sump. 

POND TEST 2 – pond test 2 was taken place after that application and results were succesful. All three tanks were completely water tighten 

WATERPROOFING APPLICATION

After the pond test waterproofing application was done with 3 coats of QS 104 as per the specifications