Step 1 :
Incase of construction of new water tanks, dense, impermeable concrete should be made by incorporating Conproof IWC (an integral waterproofing compound having plasticizing action).
Step 2 :
Sealing Tape at the joint between vertical wall and horizontal slab . Application Procedure : Cut the Colossus Sealing Tape to the required length and press onto the still fresh Colossus sealing compound, which serves as the adhesive base. Ensure that there is a tape overlap of at least 5 cm. Use a smoothing trowel to level out any uneven areas or distortions. Apply two or three coats and ensure that the tape is fully covered with the sealing compound. Use Colossus moulded Inside Corner and Out Side corner where ever it require. Colossus Inside Corners / Outside Corner are used as durable, watertight sealing in corners beneath ceramic layers. The inside corners / outside corners are embedded full surface in the sealing compound used
Step 3 :
Dilute Polyflex WP 1: 4 : 5 with water and mix with cement and pour on the bear slab to be treated. This will penetrate the pores of concrete, seal them and also improve the adhesion of sealing coats
Step 4 :
Prepare a slurry using 1 part by weight of Polyflex WP and 1¼ fresh white or grey ordinary Portland cement. Use a mix by weight of 1:1¼ for the first coat and 1:1.5 for subsequent coats. The mixing is best done using a low- speed stirrer, but continuous hand-mixing to a lump-free consistency is also adequate. Apply the slurry by brush to the damp surface. Prepare only as much slurry as can be used within 30 minutes. Keep the mix continuously stirred. Apply by brush two more coats of similar slurry at 24 hour intervals and allow to set for 48 hours. Cure the coating for 7 days by sprinkling water thrice a day on the vertical surface (external walls) and by moist gunny bags on the horizontal surface.
Step 5 :
Lay 20 mm plaster on vertical wall and 40 mm screed on floor ( cement / Sand 1:4 ) incorporating Conproof IWC / Polyflex WP with proper slopes towards the drainage points. Top of the screed to be smooth IPS finish.