Bathrooms are highly abused area when compared to all other areas at the residence. The temperature inside the bathroom varies anywhere between 40-45 degree Centigrade to 10-15 degree Centigrade. This sudden & drastic change in temperature will affect any kind of system applied. Cement has alkaline in it and the water along with the acid content in the Soap, Shampoo, Cleaning Agent etc., will stay for a long period and slowly react with the Cementitious surface. Added, to that we generally clean the bathroom with acidic materials, and hard brush on the surface which helps in etching the grout leading the water entering between the tile joints.
Looking at the problem little deep we can see that the water is entering from the Top floor bathroom to the below roof and walls. The water is travelling thru the tile joints and touching the upper portion of the roof slab and walls. Since there are invisible cracks in the roof slab the water passes through that and is visible on the below roof and wall as dampness or seepage or leakage.
1. Worn out of Tile Joints
2. Worn out of Packing in Gully Trap
3. Cracks in the Concrete
This is also causing corrosion in the steel rods. As the rods starts corroding it will start blistering and swelling which pushes the concrete and creates crack and also it becomes weak which leads to sagging and further development of cracks and the plaster falling.
As per the latest building standards, water proofing is done to the mother slab using 2 Components Part A consisting of Cementitious product and Part B consists of polymer chemicals mixed and applied together which forms a monolithic membrane, on which protective plastering is done with a cement mortar added with integral water proofing chemicals by giving slop towards the weep pipe. This protects the slab and also fills the voids and cracks. To avoid the water stagnation on the slab which enters thru the tile joints a weep pipe or sweat pipe is inserted along with the exit pipe which helps in draining out the water before it could stay & damage the slab.
It is easy to implement the latest specification in all the newly constructing buildings and it is also easy to implement at the construction stage when compared to existing building where already people are staying and using. Today at this stage it is neither recommended as it is time-consuming and needs to block from usage for almost a week nor financially viable to carry out.
Today’s technology we have polymers and epoxy which has better life span as it can withstand the temperature and abrasion due to its elongation nature.
It is recommended to wash the entire area using acid to clear the muck and fungus formed inside the tile joints and washed with high-pressure jet water. The entire area to be wiped using a mop and let too dry for some time. Using mechanical cutting tool the old tile joints should be removed and vacuumed. Apply masking tape on the both side of the tile joints to protect from the spillage of polymer /epoxy. Apply polymer / epoxy using blade adding some pressure for deep penetration. Allow the polymer / epoxy to dry for next 24 hours and remove the masking tape.
As in western countries, we do not wipe the bathroom after the shower to keep it dry. Provide good ventilation, use exhaust fan after the shower to push out the steam and help the bathroom to keep dry. It is better we use Hydrogen per oxide or vinegar along with backing soda to clean the tiles and the tile joints which has very less effect on the Cementitious materials and use tooth brush to clean the tile grouts.
Proprietor D K Associates