How to Waterproofing your bathroom

How to Waterproofing your bathroom

Waterproofing is the method in preventing the penetration of water into the building spaces. The major wet area in houses, office space, showrooms, or anywhere is bathrooms.In this article, I will show everything you need know about bathroom waterproofing in Sri Lanka.

Bathrooms are not alone a place to get fresh; it is a place of rejuvenation and refreshment. Based upon individual choice bathrooms are built. Of all other rooms in the house, the bathroom needs to be waterproofed to a maximum extinct. The whole look of the home gets disturbed when the bathroom is water penetrated. Failure in waterproofing of the bathroom may result in the loss of a good look at bathrooms. Also, it may lead to structural damage to the building. This will increase the overall maintenance cost of the building up to 30 to 35% of the total cost depending upon initial investment in the building. Hence bathroom waterproofing is the important criterion to be considered while constructing a building



  For waterproofing of the technique is cementitious waterproofing, which is the easiest way to waterproof buildings. It is the commonly used method to waterproof frequently wet areas such as bathrooms and toilets. The materials such as PVC like tape, waterproof grout, waterproof coat such as a cementitious polymer, water sealant are used.


Bathrooms and toilets require high protection against moisture. Hence composite waterproofing is preferred. In this composite waterproofing acrylic coating and tiling, the system is done using ceramic covering.


  • Surface preparations: The bathroom surface must be cleaned to make free of dust. The surface must be scrapped to make it smooth.
  • Priming of bathrooms: primer is applied with the help of roller brush up to the required height and floor of the bathrooms.
  • Bond breakers: as the primer is dried, silicon must be applied up to the required height. Silicon is applied vertically and horizontally to avoid gaps.
  • First coat of waterproofing: the membrane is applied to cover joints, sinks, shower fixtures so that all the critical areas are finished. Then the membrane should be applied to the walls and floor.
  • Second coat of waterproofing: after the first coating gets dry, a similar type of second coating is repeated by applying the membrane.


The dampness and leakages are due to the sanitary fittings that are made in bathrooms, weakening of clay material coating between the floor tiles in bathrooms, quality of plumbing materials. The following are the common defects that occur in bathrooms and toilets,

  • Structural join seepage: Low quality of material, poor application of materials leads to the seepage of structural joints.
  • Porous concrete leakage: It is due to improper design and insufficient mixing, concrete absorbs water becomes porous in nature.
  • Tile cracks: When the tiles are not soaked properly, then they lose the water-tightness over a period of time. This leads to damage by further construction activities. 
  • Rusting: Because of moisture-retaining in the floor bed results in leaching of surfaces, growth of algae, and fungi. It is due to prolonged dampness and poor ventilation.
  • Leakage at pipe penetration and joints: Without proper planning of plumbing works and lack of protection in concealed or embedded pipes, which can cause severe damage and structural defects.
  • Floor trap leakage: Floor trap is used to prevent unpleasant odor, seeping of insects into the buildings. Improper laying of floor trap so that water can seep through floors.
  • Tile debonding: because of inadequate provision or wrong detailing joints or excessive shrinkage of the substrate due to improper mixing and sufficient curing.

bathroom waterproofing in Sri Lanka

Rooftop / Bathroom Waterproofing Solutions

Rooftop / Bathroom Waterproofing Solutions

01. Cementitious waterproofing

Cementitious waterproofing is used for high moisture areas like bathrooms and toilets since they are not exposed to sunlight. This is semi-flexible.

02. Liquid waterproofing Method

03. Bituminous layering Method

Bituminous coatings proofings method is the best waterproofing method you can select, here watch video Bituminous layering waterproofing Method.

04. Polyurethane liquid membrane

This is a slightly expensive waterproofing method used to coat flat roof areas. This method provides higher flexibility.

Barralastic waterproofing

Barralastic waterproofing is a mostly used technique in Sri Lanka for water tanks or sumps before tiling or finishing surface. 

Rooftop waterproofing

Rooftop waterproofing can be done in two ways; one is a liquid applied membrane, which is a liquid form, will be used on the surface, and the other way is the preformed sheet membrane, which is a sheet that will be applied by heat or attached with an adhesive. 

Slab Waterproofing Sri Lanka

Now you may have a question on your mind whether waterproof paint can solve all these issues. True. When compared to the other waterproofing techniques, waterproof paints sound like cost-cutting options since various types of paints are available in the market at a competitive price. At a glance, you may find it helps to lower the budget, reality it is not. Will reveal the truth behind the scene.

Waterproofing paints are usually applied to the wall or the structure via a spray applicator, a brush or a roller. Once it dried on the wall, they are making a strong bond with the concrete by coating a continuous layer. These products consist of an oil or latex base. So you will feel like this is the perfect solution. Unfortunately, up to today, no one has found a waterproof paint which works in dependably. So we are not in a position to rely on these kinds of products. As well as there is a considerable disadvantage in these kinds of paints. It doesn’t last long. The coating of waterproof paint will begin to flake and peel off the walls with the time. So it is a gigantic task to remove this coating once it is dried. So this will not add a pleasant appearance, and you have to pay an extra amount of money and waste time to redo another process. Apart from these issues, waterproofing paints don’t come with consultations or warranty period. So you have to be mindful and see the long term before jumping into a conclusion.

MRC Waterproofing in Sri Lanka

So we, MRC Engineering Solutions, are the pioneers of the Waterproofing industry in Sri Lanka. We are the masters of providing exceptional pre and post consulting services for all the roofing and waterproofing issues. Our company has over six years of proven performance record. We are the service providers of all the exterior fields, which include roofing waterproofing (above and below-grade) exterior facing systems, brick, precast, and many other types of building facades. We have expertise in every area to serve you with the best. We serve our customers with an ulterior vison that to provide proficient and reliable service to our customers in all the four corners of this small island.

MRC Engineering Solutions serves the customer with multiple protection modes to its consultation services such as;

Waterproofing Systems

• Heat/fusion applied (torch on) membranes
• Self-adhesive membranes
• Polyurethane systems
• Cementation systems
• Acrylic systems
• Rubberized bitumen emulsion
• Polysulphide and polyurethane joint sealants ∙ Hypalon/ epoxy joint sealing membrane

Why should you choose us?

For the time being, waterproofing is an amateur function for the majority of Sri Lankans, when you go through this piece of work, you might get a clear idea of what exactly waterproofing is.
So if you want to invest in waterproofing your roof or any other structure, you have to consult a professional unless otherwise your money and time will be in jeopardy. So the correct choice will be ended you up with a truly watertight property. A good professional company is always going to work hard to ensure that you get the right consultation and the service. Finally, they make sure you will get the waterproofed property for the value of the money you have paid. It is always really important to check on the customer reviews since you need up working with a trustworthy service provider.

So, MRC Engineering is a well-reputed and trustworthy waterproofing company in Sri Lanka. There are experienced professionals as well as young generation professionals with more genius minds who are under our shelter to render yeoman service to our customers. Our works are crystal clear. Always we maintain transparency to keep trust with our customers. Most importantly, we make sure to use quality waterproofing products to serve the best results. Our new customers can review past work and spend plenty of time to look for different reviews. So you will get the possibility to express yourself, and we are flexible and open-armed for our customers’ ideas. If you want more clarifications or have any doubts, our team is always there for you with the free consultation service. Even after our service is done, we make sure our customer is getting the post-service consultation.

Few our major projects are All Swimming pools and waterproofing works of Southern Constructions and Engineering, Residence of Mr Sunil Mendis (former Governor of Central Bank of Sri Lanka), Residence of Mr Eric Upashantha (former Sri Lankan cricketer) at Kirulapana, Swimming pool of Mr Kithruwan Vithanage (former Sri Lankan cricketer) at Dehiwala. For more project reviews, our web site is always open for you.

Cost-effective best waterproofing company, 10 years of an industrial Warranty