Tiếng Việt
Bathroom waterproofing isn’t just a cosmetic issue — it directly affects your family’s health and the building’s durability. According to Sai Gon Home Repair 247‘s internal data, over 80% of water leak cases in homes originate from the bathroom area, leading to serious consequences such as:
Health impact: A damp environment creates ideal conditions for mold growth, causing respiratory issues, skin allergies, and other health problems — especially risky for young children and the elderly.
Financial damage: Prolonged leaks damage the concrete structure, crack walls, and cause paint to peel, requiring repeated repairs at increasing cost.
Daily life impact: Bad odors, mold, and the constant sound of dripping water are unpleasant and affect day-to-day quality of life.
1. Sai Gon Home Repair 247 — A Trusted Bathroom Waterproofing Provider in Ho Chi Minh City
With over 10 years of experience in home repair and renovation, Sai Gon Home Repair 247 has established itself as a leading bathroom waterproofing provider in Ho Chi Minh City and surrounding provinces.
Key Strengths
- Skilled team: 50+ certified technicians with an average of 5 years of experience, trained in advanced waterproofing techniques.
- Modern technology: Applying 10+ international waterproofing methods, using genuine imported materials from Singapore, Japan, and Europe.
- Quality commitment: 5–15 year warranty depending on the method used, 3-stage quality checks during construction, and 24/7 supervision.
2. Professional Diagnosis of Leak Causes
2.1. Most Common Causes
1. Faulty plumbing system (45% of cases):
- Cracked water supply pipe, loose joints
- Clogged, backed-up drainage system
- Damaged floor drain trap or shut-off valve
2. Low-quality waterproofing materials (30% of cases):
- Using cheap materials of unclear origin
- Incorrect installation technique, skipping important steps
- No waterproofing layer, or a layer that’s too thin
3. Structural issues with the building (25% of cases):
- Floor without enough slope to drain water
- Wall cracks from shrinkage or thermal deformation
- Poor design creating spots where water pools
2.2. Sai Gon Home Repair 247’s Diagnostic Process
Step 1: Overall survey
Technicians use specialized moisture meters and leak detectors to pinpoint the exact location and severity of the leak.
Step 2: Cause analysis
Checking every detail: the plumbing system, wall and floor structure, and the condition of the current waterproofing material.
Step 3: Report and consultation
Preparing a detailed report with photos, and proposing 2–3 solutions suited to the customer’s budget and requirements.
2026 Bathroom Waterproofing Price List
| ITEM | PRICE (VND) |
|---|---|
| Bathroom waterproofing with Sika | 1,200,000/unit (tile re-laying not included) |
| Bathroom waterproofing with Kova | 800,000 – 1,000,000/unit (tile re-laying not included) |
| Floor drain waterproofing | On-site survey & quote |
| Removing tiles, waterproofing, and re-laying new tile | 3,500,000 – 5,000,000/unit |
| Cutting out old grout and re-grouting the bathroom | 1,500,000 – 2,200,000/unit |
#Note: The prices above are for reference only. Please call HOTLINE: 076 806 7114 (English & Korean support) for the latest advice and quote.
3. Best Bathroom Waterproofing Methods in 2026
| Solution | Advantages | Important Notes | Expected Lifespan |
|---|---|---|---|
| Liquid PU (polyurethane) membrane | Highly elastic, bridges small cracks | Base must be dry and clean; needs a suitable primer | 7–10 years |
| Cement-polymer mortar (Sika 107, polymer-modified cement) | Handles damp substrates well, easy to apply | Needs enough coats and proper moist curing | 5–8 years |
| Elastic coating (emulsion/KOVA) | Fast, moderate cost | Limited effectiveness on large dynamic cracks | 3–5 years |
| Torch-on/self-adhesive bitumen membrane | Excellent waterproofing on a stable substrate | Sensitive to surface condition; joints need careful sealing | 7–10 years |
| PU/epoxy sealant + additives | Good for localized repairs | Not a substitute for a full waterproofing system | 2–4 years |
| Fiberglass mesh reinforcement | Improves resistance to hairline cracking | Always combine with a waterproofing coating | Depends on the main coating layer |
*Durability depends on workmanship, substrate condition, use, and maintenance.
3.1 Liquid PU Membrane
- When to use: Substrate at risk of minor cracking that needs elasticity; ideal for apartment bathroom floors.
- Process summary: Roughen the surface → apply primer → brush/roll 2–3 coats of PU (to the correct coverage rate) → reinforce corners and pipe collars with mesh and PU sealant → protect the surface → lay tile.
- Common mistakes: Applying too thin a coat, not addressing moisture → causes bubbling.
3.2 Cement-Polymer Mortar
- When to use: Substrate is still damp and needs strong adhesion to concrete.
- Process: Dampen the substrate (no standing water) → mix at the correct ratio → apply 2–3 coats perpendicular to each other → moist-cure as recommended → lay tile after the required waiting period.
- Mistakes: Mixing too thick or too thin; skipping the curing step → causes hairline cracking.
3.3 Elastic Coating (Emulsion)
- When to use: Quick fix, moderate budget, surface with minimal dynamic cracking.
- Process: Clean → primer coat → 2–3 coats of elastic coating → check the application rate.
- Mistakes: Laying tile too soon, or applying too thin a layer → reduces lifespan.
3.4 Torch-On/Self-Adhesive Bitumen Membrane
- When to use: Stable concrete floor with no major movement; ideal for ground-floor bathrooms in townhouses.
- Process: Bitumen primer → torch or adhere the membrane, sealing joints tightly → treat pipe collars with specialized pipe-collar fittings → protect the membrane layer.
- Mistakes: Open joints, or overlaps not angled correctly with the drainage direction.
3.5 PU/Epoxy Sealant + Mixed Additives
- When to use: Fixing localized cracks or open tile grout; not a replacement for a full waterproofing system.
- Process: Open up the crack/grout line → clean → inject sealant → finish the fill → apply a waterproofing topcoat.
- Mistakes: Only injecting sealant without a full topcoat → the leak recurs.
3.6 Fiberglass Mesh Reinforcement
- When to use: Substrate with hairline cracks, at wall-floor corners, or around pipe collars.
- Process: Prime → lay the mesh → apply a waterproofing topcoat → make sure the mesh is fully covered.
- Mistakes: Laying the mesh without enough coating on top → water finds its way through.
4. FAQ — Common Questions About Bathroom Waterproofing
How soon after the work can I use the bathroom again?
It depends on the material: elastic coating/cement-polymer mortar usually needs 24–48 hours; PU/torch-on membrane may need 48–72 hours before tiling and use. Always follow the manufacturer’s recommendation.
Do I need to waterproof the walls, or just the floor?
At minimum, the floor plus 20–30 cm up the wall. If the wall gets wet often (standing shower area), raise it to 1.2–1.8 m.
Is it durable without removing the tiles?
Yes, if the cause is grout lines, pipe collars, or corners and the work is done to standard. If the substrate is porous, badly cracked, or has the wrong slope, removing the tiles is the better option.
What’s the difference between PU and cement-polymer mortar?
PU is more elastic, suited to small cracks; cement-polymer mortar handles damp substrates well and bonds strongly to concrete. Choose based on the substrate condition and how much elasticity is needed.
5. Book a Free Survey with Sai Gon Home Repair 247
- We visit the site, check the slope, pipe collars, corners, grout lines, and cracks in the substrate, take measurements, and advise on a solution.
- We send a detailed cost estimate per square meter, plus the construction timeline and warranty terms in writing.
- Work is carried out following the correct process, with proper material coverage, and a photo log.
- Acceptance is confirmed with a 24–48 hour water-soak test.
Call Hotline: 076 806 7114 (English & Korean support) or 0707 759 247 to book Sai Gon Home Repair 247 for the same day. On-site surveys are free in Ho Chi Minh City.
