Before carry out the waterproofing treatment of terrace, we inspect and ensure that substrates are free of cracks, protrusions, damage to surface integrity etc. In addition, our special attention shall be given for openings of drain pipes on substrate and detailing at the penetrations of any pipes, cables, air-con mountings, etc., shall be carefully carried out.We have done all the necessary rectification and preparatory works before installation of system. The methodology, which we commonly followed for doing waterproofing job are as under:
All the drain pipes openings shall be just above the prepared substrate surface, and if they are not, either the substrate shall be repaired or the drain pipe relocated suitably.
Cleaning and removing of loosely adhering particles with wire brush/blower/ high pressure water jet wash and made free from any other contaminants (if any).
Surface shall be prepared with ready to use repair mortar or polymer modified mortar to receive the waterproofing properly after opening of cracks in 10 x 10 mm “V” Shaped grooves and 20 x 20mm in brick wall, in case of live cracks the same shall be filled with flexible sealant. The pipe joints are to be sealed specially with epoxy mortar.
Grouting operation shall be done at construction joints at a distance @ .75 to 1.0 Mtr C/c with NSGC or Epoxy strengthening grout.
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.
Coving of 100 x 100 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 protect with minimum 50mm thick M-15 grade cement concrete in panels of 2.5 x 2.5 Mtr. by maintaining 10 x 10mmgroove completely sealing with flexible sealing compound.