Socketing (if required)

In case of leakages in the base slab, socketing work should be done in the following manner.

Fill up the BATHROOM slab with 7 cm of water (after plugging trap hole), preferably a day before.

Keep the slab filled with water overnight (i.e. for at least 12 hours).

Check for any leakage in base slab or underneath, the next morning.

If a major leakage is observed, locate the spot with porous concrete and provide a socket for grouting. In addition, provide four sockets at each corner of the slab. Grout the sockets with cement slurry, with consumption rate of 1 bag of cement to 75 to 100 liters of water. To spread the slurry in the porous portion of the concrete, it is required to flow the slurry with velocity. It can be achieved by passing the slurry with velocity. It can be achieved by passing the slurry through G.I. pipe with a head of about 1.5 m to 2.0 m or by using the pressure pump.

If there is a minor leakage in the base slab, put the cement slurry (rala) directly over the base slab with the help of a trowel and brush spread this slurry all over the base area of BATHROOM.

It is further understood that the process of socketing and grouting is to be continued until the leakage in the base slab is totally stopped.

After completion of cement grouting and testing for leakages, remove the sockets.

Base coat for bathroom waterproofing

After stooping any leakages in the base slab, provide 15 to 25 mm thick cement mortar base coat in proportion of 1:4 with a slope of 25 mm. (1”) in 3m (10’0”) from entrance door towards nahani trap.

This base coat should cover all the walls around, upto the outer face wall line at the entrance door and the bottom portion of the nahani trap connection hole made in the wall.

Flood this base coat with water, upto the slab drop, for a minimum of four days, for curing and testing, due care should be taken to plug the nahani trap opening.

Fix the nahani trap and water escape pipe/leakage drain pipe over this base coat. Also lay all the concealed pipes such as G.I. outlet pipe for wash basin etc.

Brickbat coba coat for bathroom waterproofing

Select well burnt (pucca) brickbats. Use of overburnt brickbats should be strictly avoided.

Before laying brickbats, soak thoroughly in water for at least half an hour.

Lay the well burnt (pucca) brickbat on the edge (kadi) and not on a flat surface.

Any gaps between the brickbats should be filled with mortar. Complete the brickbat coba coat with joints filled with cement mortar in 1:6 proportion. Also use water-proofing compound as per the specified dose per bag of cement while filling the joint.

Give the slope of 1:100 in brickbat coba coat from the entrance door to the water escape pipe.

All the holes made in the wall for P.V.C./C.I. pipe connections should be finished with water-proofing coba along with this coat.

Cure this coat by ponding water for four days and check for any leakages.

Topping coat for bathroom waterproofing

After curing the brickbat coba coats, complete the topping coat using 1:4 cement-mortar mixed with water-proofing compound, with a proper slope from the entrance door to the nahani trap. Finish this coat with cement slurry using a metal float/polish patra. Roughen the top coat using a wire brush (or bunch of binding wire), to receive tile mortar bonding.

Ensure that this coat on walls does not project beyond the bathroom wall plastering coat. Projected waterproofing will pose problems at the time of bathroom dado tile fixing work.

Cure this final coast for a minimum of seven days with standing water (minimum 7.5 cm depth).