Thursday, September 8, 2011

WATERPROOFING OF SUNKEN SLABS IN THE TOILETS AND WC'S


(Click to Enlarge)

This is a very important and often neglected area. For this proceed as below after ensuring that work of the plumber is over:

  • Injection grout the areas as detailed before but placing the nozzles at every 50 cms in lace of 75 cms.

  • Prepare haunches on the entire vertical horizontal joints with a polymer admixed mortar over a polymer slurry.

  • Ferrocement the sides.

  • Provide a 25-mm slope in the mortar towards one side and at the point where the slab wall opens into the shaft place a nozzle leading out of the slab to drain out water.

  • Apply penetrating slurry on top of this plaster, to seal the same.

  • Apply an acrylic or polyurethane coating on top of the pipes to prevent the same from rusting.

  • Lay minimum 50mm thick concrete screed for laying the floor using 10 mm aggregate.

  • Use tile adhesives for all the floor titles.

  • Use waterproof tile grout for the entire tile joints.

  • Ensure proper slope in the toiled/bathroom floor.

  • Ensure proper grouting of all traps with rich mortar.

  • Seal wit butyl sealant all joints of the fittings to the floor as also the joints of the traps to the floor.

  • Seal the joints of the bathtub and the wall with a cartridge silicone sealant.


    Avoid the following

    • Use of tiles of the water absorbing type such a slate etc.

    • The practice of encasing the C.I. pipes in concrete, as the same offers no advantages whatsoever and creates weak points.

    • Filling up the sunken portions with cinder.

1 comment:

  1. interesting blog. It would be great if you can provide more details about it. Thanks you



    Waterproofing

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