Causes of seepage and effective waterproofing methods

 Mastering the process of outdoor waterproofing paint, you can supervise the construction team. And make sure that you will get the house you want, worth the cost. Today, due to the strong increase in waterproofing demand, the use of exterior paint is not enough, then the use of outdoor waterproof paint ensures the best wall waterproofing effect.

Causes of seepage and effective waterproofing methods

Waterproofing experience

There are many causes of seepage, such as because the concrete structure is not well compacted, because the masonry is not saturated, the plaster is not strong, the water-proof paper is damaged, and the outdoor waterproof paint film is damaged. … Common leaky locations such as roof floors, terraces, etc. especially vertical walls. Therefore, when using outdoor waterproof paint to prevent and overcome, you need to apply the following experience:

Should be waterproof

Carry out wall waterproofing from the side of the water source to be able to actively and effectively waterproof, also known as forward waterproofing. Waterproofing from behind the water source is performed only when it is not possible to waterproof it, hence the name reverse waterproofing.

Should waterproof "x2 layers x2 layers".

That is, using successive waterproofing measures instead of just one time is done. As with rough, convex wall surfaces, you can't just apply a coat of waterproof paint outdoors. You need to pay special attention to these defect locations for lasting waterproofing effect.

For concrete structures, before applying outdoor waterproofing paint, it is necessary to compact the concrete to increase its ability to prevent water.

Choosing a quality outdoor waterproof paint product will give the best effect

Because in addition to paint, other by-products such as primer, as well as thorough wall cleaning are also important factors for successful waterproofing.

It is recommended to paint outdoor waterproof in dry weather

The surface to be waterproofed must be very dry because if it is wet, the outdoor waterproof paint will blister or cause mold. That's also why outdoor waterproofing should be done on dry days.

Should clean the wall thoroughly before waterproofing

Scrape off peeling paint and clean thoroughly to provide a clean, smooth wall surface. This not only increases the waterproofing effect but also increases the aesthetics of the wall surface.

Outdoor waterproof coating process

Step 1: First scrape off the peeling paint or powder dust with a stiff brush.

Step 2: After the walls have been smoothed, they need to be cleaned and disinfected.

And do not allow stains or dirt to remain because they will reduce the adhesion and effectiveness of outdoor waterproof paint.

Step 3: To effectively waterproof the old and new walls, it is necessary to ensure the following requirements: the surface must be dry, clean of dust, soil, and grease.

Step 4: Before applying waterproofing, to stabilize the surface, seal all cracks (if any).

Step 5: To enhance the adhesion and coverage of the material, apply a coat of Revinex® mixed with water in the ratio Revinex®:water-1:4.

Step 6: After 12 h of dry primer, thoroughly stir Silatex®Super with a mixer at 500 rpm, then roll/sweep at least 2 layers at right angles. The first layer is mixed with water (5%). The second layer is applied after 24 hours, pure.

The reason construction experts always recommend projects to conduct waterproofing at the beginning of construction, because well-constructed construction works not only bring high durability, stability Predetermine the impact of the environment and peace of mind for users, but also give efficiency and save maximum time, effort and money for the project owner.

Choosing the right home wall waterproofing method

The walls of the house are the most susceptible to seepage, but the easiest to waterproof. The simplest and most widely used solution today is to use waterproofing. The waterproofing agent will create a bonding film that prevents water from entering the wall surface. The stronger the bonds, the more resistant to abnormal environmental factors and the higher the waterproofing effect.

New construction wall waterproofing has many construction methods such as:

Use specialized waterproofing membranes.

Use sweeping waterproofing materials.

House wall waterproofing is classified into indoor wall waterproofing and outdoor wall waterproofing.

Therefore, the newly built wall waterproofing method depends on the choice, using waterproofing materials, but all must go through the preparation stage before using the materials as follows:

Walls need to be carefully inspected before construction, detecting cracks, holes, weak grout areas.

For cracks under 4mm, it is necessary to punch a V-shape with a depth of about 1.5-2mm, then seal with Jointex matt.

Weak or protruding mortar areas need to be chiseled out and then plastered with a layer of Revinex mixed with mortar in the ratio Revinex: water 1:3:0.2 (cement, sand, revinex) to smooth.

Clean the wall surface with a grinder, an industrial vacuum cleaner, etc. to ensure maximum adhesion to the waterproofing material.

Mix Revinex with water at a ratio of 1:3 then sweep, roll or spray at a rate of 0.2 kg/m2

Conduct construction using Neoroof waterproofing material rated 0.3 kg/m2/2 layers

The first layer is mixed with water (5%). The second layer is applied after 24 hours, pure.

Choose wall waterproofing materials

In the rainy season, the humidity is high, the rainfall is abundant, the seepage occurs rapidly. When the weather is dry, moisture in the air flows through the tiny holes in the wall, accumulates and causes serious damage to the structure. Therefore, choosing a specialized waterproofing material for house wall items is an urgent requirement for new constructions.

Clean the surface before waterproofing the toilet floor

The first important toilet floor waterproofing technique is to ensure the surface of the toilet floor. First, it is necessary to remove, remove and clean up obstacles: formwork, wood, iron and steel, debris, standing water...

Technical boxes in toilets (if any) and walls should be built and plastered with cement mortar at least 30 cm high to reinforce waterproofing in sync with the concrete floor.

Surface treatment where waterproofing of toilet floors is carried out

Chop, chisel away excess layers of cement mortar and concrete to expose the structural concrete surface with hand tools: hammer, chisel, sharp chisel...

On the surface of structural concrete, check and open the mouth of large long cracks or through the floor (if any) along the groove 1-2cm wide, 2cm deep.

Around the mouth of the neck of the drain pipe through the concrete floor (if it is located right during the concreting process, but the equipment has not been installed), install the expansion product (Hydraulic bar) and reinforce it with mortar non-shrink offset.

In case the concrete floors are skewed floors (WC area), in addition to the leveled concrete side ledge, the side ledge of the wall that is covered with bricks and mortar right above will be treated with waterproofing reinforcement at least 20cm high. more (to avoid water seeping on the base of the wall for actual use later).

Grind the entire surface to be treated for waterproofing with a grinder fitted with an iron brush to remove all remaining impurities and dirt to have a clean, firm surface for the penetration of good waterproofing solution.

Clean dust and dirt on the entire surface to be treated with a broom, brush or hand blower.

Treatment of pipe neck through the toilet floor

Pump foam glue to create a base around the neck of the pipe with a thickness of about 2 – 4cm

The rubber band expands around the neck of the tube

Pour non-shrink grout until almost full

Then take the iron rod to stuff the mortar around the neck of the pipe

Apply coating around engineering duct area with Neoproof Pu 360

Stick the reinforcing mesh around the neck of the pipe.

Apply the next coat of technical floor mesh and pipe necks

The waterproofer injects glue around the neck of the pipe

With just the above steps, you can safely and effectively step into the process of waterproofing the toilet.

Consequences if not waterproofing apartment toilets

The situation of waterlogging, stagnation for a long time causes damage to the surface of the toilet floor.

Moss appears everywhere, reducing the friction of the floor surface, which is dangerous in moving you and your family.

The toilet space is always stuffy and stuffy.

Many pathogens appear to you and your loved ones, house paint to dry, especially young children and the elderly such as dermatological diseases, respiratory diseases, ...

The ceiling and walls are leaking and cracked.

The apartment is deformed and degraded quickly

Danger to users:

Penetrating the toilet wall causes a dangerous fire and explosion. In the long run, leaking toilets spread to the whole apartment, damaging the structure, causing confusion for residents. So what is the importance of waterproofing apartment toilets? Or why should apartment toilets waterproof?

The benefits of waterproofing apartment toilets are:

Saving on repair costs incurred:

 Because the initial cost of waterproofing the toilet is very little. But the price to pay when a leak occurs is extremely large, including the cost of perforating the tiles, the cost of pouring it away, the cost of waterproofing, the cost of re-tiling….

Preserving the beauty of the apartment with the years

Protect the health of residents

Safety for the user

Improve the durability of use

Waterproof walls are a common phenomenon nowadays. Not only old houses but also newly built houses are hard to avoid this phenomenon.


Common materials have capillaries (distances between particles) that are between 20 and 40 micrometers in diameter. Therefore, when the surface of the material is in contact with water, water will penetrate through the gap at the surface, thereby permeating through the capillaries into the interior (capillary), causing permeation.

The house wall is permeable due to the location of the floor drainage pipes, the technical box, the border of the wall, the gutter on the roof floor... Water and moisture will come from below through the cracks in the crow's feet, cracks in the ceiling. , the hollow capillaries of the wall flow downwards, for a long time, the walls of the house are soaked with water, causing rotting of the water-based paint layer, forming patchy patches.

Water from the toilet floor, originating from the floor drain pipe, spreading from the base of the wall to the surface will cause the wall to crack. This is also one of the causes of wall leaks.

In the house, if there are ceiling cracks, the risk of wall penetration will be high. Because rainwater easily flows in, over a long period of time, it leads to large-scale wall penetration.

Note: In order to minimize the situation of walls being soaked, during the construction process, it is necessary to pay attention to the technical stages, choose the best materials and use effective waterproof paints.

Consequences of the wall being permeable

Permeable walls are not only unsightly but also cause some serious consequences below:

The building deteriorated rapidly

Leakage is one of the leading causes of rapid deterioration of building quality. The peeling, cracking of concrete is a warning sign that your building is deteriorating and contains potential dangers that are unpredictable.

Therefore, as soon as you start seeing seepage, you need to take corrective measures to avoid letting them spread to other places for a long time.

Losing the aesthetics of the entire building

This is one of the first consequences that we can easily see when a leak occurs. Concrete cracks, yellow stains and even moss will make the building lose its beauty.

After only a few rains or when the plumbing system leaks, each patch will spread gradually, the paint color will gradually fade, peeling occurs, the aesthetic beauty of your house is also lost.

Potential risk of fire

The wet condition of the walls and ceilings not only produces harmful mold but also carries a deadly danger. Electrical outlets or wall-mounted electrical equipment are inherently considered safe, but when soaked in water for a long time, it will lead to damage and reduce the durability of electronic items in the house: televisions, refrigerators, washing machines. …

Even more dangerous can lead to fire, explosion, short circuit, electric shock, ....

A humid environment is harmful to health

Long-term humid environments, especially places where there is no gas such as walls and walls, are favorable conditions for mold to grow.

The black and green molds are home to hundreds of bacteria that, when inhaled, lead to respiratory diseases such as rhinitis, sinusitis, skin fungus... These diseases are especially dangerous for the elderly and young. small. Because of the above serious consequences, it is necessary to have thorough waterproofing methods for your walls.


The waterproofing of the house right from the start of construction will bring absolute efficiency and save maximum time, effort and money for each family.

Indoor wall waterproofing.

For new house walls, waterproofing in the house seems simpler and easier. Because at this time, the new wall shows signs of being permeable, has not yet spread, and has not appeared crow's feet or peeling paint.

Your job now is to prepare wall putty, primer, ... and specialized tools such as paint brushes to handle.

First, use wall putty to cover the surface of the place where waterproofing is required. Then smooth and smooth the surface of the wall, use a special tool to apply the primer, then the waterproof paint, then wait for the paint to dry.

Exterior wall waterproofing.

Outdoor wall waterproofing method can only be applied in the following cases:

Walls of separate buildings, not adjacent to or sharing walls with other buildings

The wall of your house is built first, not covered by the following construction works

Walls of apartment buildings and high-rise buildings can be waterproofed outdoors

How to handle waterproofing of exterior walls of newly built houses as follows:

Prepare tools such as concrete, cement, sand, etc. to mix 1 or 2 component waterproofing mortar. Or you can apply wall waterproofing or suitable waterproof paint on the outside of the concrete to prevent water from seeping inside.


For walls that are permeable in old or degraded houses, follow these steps:

Step 1: Scrape off the peeling paint of the wall. Then clean the affected areas, usually covered with moss.

Step 2: Find large cracks and crevices caused by stretching of construction materials for a long time.

Step 3: Use mortar to fill these gaps with interior walls. And use specialized powder for exterior walls.

Step 4: Treat with waterproof paint. Apply one or two coats of waterproof paint. Provided that the painted surface needs to be clean and dry, the required moisture content of the wall is less than 16%.

Note: When treating with waterproof paint, you must clean the old wall or the new paint will not adhere well and ensure quality.


Cracked and cracked walls are one of the common conditions today. Depending on the severity of the crack, we will have different waterproofing methods.

If the wall is new, the cracks, or the cracks are small, you can just use a specialized waterproofing glue to seal the cracks.

However, for old houses with large cracks and cracks, you need to pay attention to clean dirt and walls before construction, follow these steps:

Carry out chiseling 3-4cm wide and deep around the crack in the wall

Spray clean curse

Use specialized materials to seal cracks

Cover the surface with stretchy waterproof membrane

Note: For indoor items, it is possible to cover with a protective mortar layer (paste) with a thickness of between 03mm and 10mm depending on requirements. After a 12-hour period, water curing is required to ensure optimum performance.


In big cities or urban areas, most of the houses are built adjacent to each other, with almost no gaps. Therefore, when experiencing some impact from the weather or the environment, the walls will be seeped and cracked...

There are a number of reasons why adjacent walls often seep, such as:

The location is narrow, difficult to waterproof. Or waterproof construction is not effective due to space constraints.

Prison space, secret, easy to accumulate rain water, so it often causes leaks.

In case your house is built behind the neighbor's house, there will be no space to conduct waterproofing from the outside in.

Unstable foundation, subsidence causes walls to crack and leak.

Leaking from the neighbor's wall when building close to the wall. Especially that wall area has a drainage pipe system.

Therefore, to waterproof the adjacent house, you follow some methods below:

Waterproofing adjoining houses by treating the gap with a drain chute.

The adjoining wall between the two houses has a small gap and that is the position where the water will seep in. To prevent this situation, the most effective method is to design corrugated iron gutters to prevent water from flowing down into the wall.

At the junction between 2 wall slots, place a fixed piece of corrugated iron along the wall slot. Water will be blocked by this corrugated iron gutter, thereby preventing water from entering between the 2 wall slots.

Waterproofing of adjacent house walls at the beginning of construction.

This is considered the safest and most effective solution. During the exam, in the adjacent adjoining position, you use solid bricks, mortar mixed with waterproofing concrete, plastered with high marks. The adjoining wall thickness requires a minimum of 220mm to ensure the prevention of wall leakage from the outside.

In case your house is built first, you can completely plaster the outer protective wall layer through which the waterproofing ability of your wall will be higher. After building and plastering the outer wall, you can use many different types of waterproofing materials to apply the outer wall.

Reverse waterproofing for adjacent walls

When it is not possible to waterproof the junction between two houses since new construction, the reverse waterproofing method will be considered the most.

Case 1: Reverse waterproofing for newly built houses.

For newly built houses, when the brickwork is finished, do not plaster the walls, but carry out reverse waterproofing.

Case 2: Reverse waterproofing for old houses

For old houses with seepage, it is necessary to cut off the inner wall, then reverse waterproofing treatment and then re-plaster to achieve the highest efficiency.

To conduct reverse waterproofing, follow these steps:

Step 1: Use a waterproofing additive as a bonding agent.

Step 2: Use Water Seal DPC crystalline waterproofing solution to spray 2 layers for waterproofing, each layer is 4-5 hours apart.

Step 3: Wait 2-3 days for Water Seal DPC to dry completely inside the wall, then splash water to check the reverse waterproofing. If the water is not penetrated, the standard is met, the locations are still seeped, then re-scan.

Step 4: Finish plastering and proceed with the house painting process as usual.

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