Bathroom waterproofing

Why bathroom waterproofing is necessary?

Bathroom waterproofing is a mandatory step to protect both the structural integrity and the aesthetics of a building. This area is constantly exposed to water, and if it is not handled with proper techniques, it will quickly lead to dampness, leakage, and serious impacts on health as well as the lifespan of the house.

A humid environment easily causes water leakage

Bathrooms always have high humidity due to daily activities such as bathing, washing, and personal hygiene. If floors and walls are not thoroughly waterproofed, water will gradually penetrate the surfaces, causing peeling, yellow stains, or leakage to lower floors.

Consequences of improper waterproofing

• Mold and moss appear, causing slippery and unhygienic conditions

• Musty odors develop, negatively affecting health

• Structural components weaken, leading to costly repairs

• Walls become yellow-stained and tiles loosen, reducing aesthetics

Signs that indicate bathroom waterproofing is needed

Early identification of leakage signs helps ensure timely treatment and cost savings. Several typical warning signs indicate that the bathroom needs to be waterproofed again immediately:

Yellow-stained walls, peeling floors, and damp odors

Patchy yellow stains on walls, ceilings, or floors are clear indications that water has penetrated through the finishing layer. In addition, musty odors, loose tiles, or blistering surfaces confirm that the waterproofing system is failing.

Water seeping into adjacent rooms

When water from the bathroom spreads into nearby areas such as bedrooms or living rooms, this is a serious warning sign. Water may leak from pipe collars, tile joints, or concealed floor pipes, requiring thorough and immediate treatment.

What causes bathroom leakage?

There are four main causes of bathroom leakage even when tiles and finishing materials have already been installed. If not inspected and treated early, leakage will spread and cause severe damage to the building.

Poor initial waterproofing installation

Many projects only install tiles while skipping specialized waterproofing layers. In some cases, waterproofing is applied but low-quality materials are used, or pipe collars and wall bases are not treated according to proper technical standards. After a period of use, water begins to penetrate through weak points.

Problems with the drainage system and concealed piping

• Water supply and drainage pipes crack or leak inside walls

• Floor drains are installed incorrectly, causing water to pool around the drain opening

• Insufficient floor slope leads to standing water and gradual seepage

Aging grout and floor tiles

After several years of use, tile grout may crack or peel, allowing water to gradually seep through these gaps into the underlying base layer. If not re-treated with specialized grout materials, leakage will spread rapidly.

What happens if bathroom waterproofing is not treated in time

Ignoring bathroom waterproofing will cause serious impacts on both the building and users’ health. Below are three typical consequences:

Impact on structural integrity

Long-term water penetration weakens concrete layers and brick walls, leading to subsidence or cracking. If prolonged, this can become a hidden cause of severe damage to the entire structure.

Poor hygiene and health risks

A damp environment creates favorable conditions for mold growth, which harms the respiratory system, especially for elderly people and children. Persistent musty odors also reduce daily living quality.

Increased repair costs

When leakage becomes severe, repair work is far more complex and costly than applying waterproofing from the beginning. In many cases, tiles must be removed and fixtures dismantled to achieve thorough treatment.

Which bathroom waterproofing materials should be chosen

Choosing suitable waterproofing materials helps ensure effective construction, cost efficiency, and long-term durability. Depending on project conditions, you can consider the following common material groups:

Advantages and disadvantages of each material

Material recommendations by situation

• Old bathrooms requiring thorough repair: Sika system + grout + pipe collar treatment
• New bathrooms requiring high durability: polyurethane or 3 mm torch-applied bitumen membrane
• Upper-floor bathrooms prone to cracking: polyurethane with elasticity greater than 400%

Bathroom waterproofing price list in Đà Nẵng – SKSumo

The bathroom waterproofing unit price in Đà Nẵng by SKSumo starts from 120,000 VND/m². Prices vary depending on the construction method, materials used, and the required warranty duration.

Bathroom waterproofing price list by material

Below is the bathroom waterproofing service price list in Đà Nẵng by SKSumo, updated according to each type of material and the actual condition of the project. Prices include basic materials and labor:

Additional treatment unit prices under WC waterproofing scope

What is an effective bathroom waterproofing process

A technically correct bathroom waterproofing process must ensure thorough treatment from floors and walls to pipe collars and floor drains. Below are the two most common processes currently applied by SKSumo:

Waterproofing with torch-applied membranes and self-adhesive membranes

Waterproofing using the Sika Latex – Sika Membrane coating system

Step 1: Prepare a dry surface, remove dust, and fill cracks

Step 2: Treat pipe collars with SikaGrout mortar and an expanding gasket

Step 3: Form wall base corners using cement mixed with Sika Latex

Step 4: Apply a primer layer (cement + water + Sika Latex) over the entire floor

Step 5: Apply 2–3 coats of Sika Membrane, spaced 4–6 hours apart

Step 6: Perform a 24-hour water test and acceptance inspection

Areas and items to inspect when waterproofing a toilet

Before carrying out bathroom waterproofing, a thorough site inspection is an extremely important step to help select the correct method and suitable materials, while also avoiding missing areas with potential risk of reverse leakage. Below are the key items and locations that need to be carefully inspected:

Bathroom floor and wall surfaces

It is necessary to check surface flatness, drainage slope, cracks, peeling, or signs of reverse seepage from the floor upward. Areas with bulging tiles or crumbling grout are clear indicators that the substrate has deteriorated and needs to be re-treated with proper waterproofing.

Drainage system and floor drains

Floor drains must ensure complete watertightness, with no water leakage around the drain opening or along the pipe. Concealed floor pipes should also be checked for blockages or hidden leaks.

Concealed wall water pipes

This is an area where failures are likely to occur but are difficult to detect visually. Specialized equipment should be used to check for leaks or pipe cracks, especially at joints or aging pipe sections.

Tile grout and tiled floor base

After several years of use, grout often shrinks and develops fine cracks, allowing water to seep beneath the floor. If the floor is old, it may be necessary to remove the entire tile layer and reapply waterproofing from the beginning.

Floor drain pipe collars and wall–floor intersections

These are two locations that are extremely prone to leakage. Careful treatment is required by forming proper corner fillets and sealing with specialized waterproofing materials such as polyurethane sealant and non-shrink mortar, combined with wrapping expanding gaskets around the pipe collars.

When all the above items are inspected and treated according to proper technical standards, toilet waterproofing performance will be more durable for many years and will significantly minimize issues during use.

What makes SKSumo bathroom waterproofing services special

SKSumo Đà Nẵng waterproofing company specializes in bathroom waterproofing with more than 10 years of experience, a professional workflow, and clear warranty policies. Customers choose us for our technical expertise, transparency, and strong commitment to quality.

Outstanding advantages in technology and materials

• Simultaneous application of multiple technologies such as Sika Latex, polyurethane, bitumen membranes, and self-adhesive membranes
• On-site inspection to identify the root cause of leakage and provide thorough solutions
• Proper technical execution, with construction drawings provided upon request
• Use of genuine branded waterproofing materials (Sika, Visco, Flintkote, Polyurea)

Clear warranty and on-schedule execution

• Commitment to on-time handover, clean and orderly construction, and minimal disruption to daily activities
• Warranty policy ranging from 3 to 10 years, depending on materials used and actual site conditions
• Clear contracts and detailed acceptance for each work item, ensuring customer rights

Bathroom waterproofing is a mandatory solution to maintain the durability and aesthetics of a building. Choosing a reputable contractor like SKSumo together with suitable materials will help you completely resolve leakage issues and save long-term costs. Do not let hidden water leaks silently damage your living space-take proper action starting today.

Frequently asked questions about bathroom waterproofing

How much does bathroom waterproofing cost per square meter

The price typically ranges from 150,000 to 800,000 VND/m² depending on the materials used. Sika Latex, Kova, and torch-applied membranes are common choices. Premium polyurea systems cost more but can last up to 15 years.

Does an old toilet require tile removal for waterproofing

Tile removal is not mandatory. SKSumo offers bathroom waterproofing methods that do not require tile demolition, with treatment applied from the surface. However, if the existing tiles are too old or peeling, full reconstruction is recommended to ensure effectiveness.

How long after waterproofing can the bathroom be used

In most cases, the bathroom can be used normally 24 to 36 hours after waterproofing. If the floor is re-tiled, the completion time may extend by an additional 1 to 2 days.

Is there a warranty for toilet waterproofing

Yes. Bathroom waterproofing services at SKSumo come with a warranty ranging from 3 to 10 years depending on the applied method. Clear contracts and acceptance records are provided.

Is free on-site inspection available

SKSumo provides free on-site inspection services in Đà Nẵng and surrounding areas. Contact the hotline at 083 999 0123 to schedule an appointment quickly.