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CONCRETE SPALLING REPAIR
Expert repair of concrete spalling caused by reinforcement corrosion, carbonation, or water damage. We restore structural integrity and prevent further deterioration.
Concrete spalling is a common issue in Singapore's humid climate. When reinforcing steel corrodes, it expands and causes the concrete cover to crack and fall off. Left untreated, spalling accelerates and compromises structural safety. Our professional repair process addresses both the symptoms and root cause.
Why Us
WHY CHOOSE OUR CONCRETE SPALLING REPAIR SERVICE
- Stops further structural deterioration
- Restores structural integrity
- Prevents reinforcement corrosion
- Long-lasting repair solution
- High-strength repair materials
- Proper surface preparation
- Warranty coverage
- Experienced specialists
What We Offer
COMPREHENSIVE COVERAGE
01
Rust Treatment
Thorough cleaning and treatment of corroded reinforcement with rust converter and protective coating.
02
Concrete Restoration
High-strength repair mortar to restore concrete profile and cover.
03
Protective Coating
Anti-carbonation coating to protect repaired areas and prevent recurrence.
04
Crack Injection
Epoxy injection to seal cracks and restore structural bond.
05
Surface Preparation
Proper preparation including sound concrete exposure and bonding primer.
06
Aesthetic Finishing
Color-matched finishing for a seamless appearance.
What It Is
WHAT CONCRETE SPALLING IS
Concrete spalling is when pieces of concrete crack, bulge and break away from a ceiling, beam, column or wall. It almost always starts with the steel reinforcement inside. When that steel rusts, it expands to several times its original volume, and the pressure pushes off the concrete cover in front of it.
Signs to look for:
- Brown rust stains or streaks on a ceiling or beam
- Cracks that follow a straight line, often along the path of a steel bar
- Bulging or bubbling paint and plaster
- Patches that sound hollow when tapped
- Flakes or chunks of concrete on the floor, or exposed rusty steel
Not every crack is spalling. Fine plaster cracks without rust or bulging are usually a finish issue, covered under wall crack repair.
Causes
WHY SPALLING HAPPENS IN SINGAPORE
Carbonation
Fresh concrete is alkaline, which protects the steel from rusting. Over many years, carbon dioxide from the air reacts with the concrete and lowers that alkalinity from the surface inwards. Once the carbonated zone reaches the steel, the protection is gone and rust can start, especially where moisture is present.
Chlorides
Chlorides break down the protective layer around steel even in alkaline concrete. They can come from sea air in coastal areas, from contaminated materials in older construction, or from cleaning chemicals used over time.
Moisture and leaks
Singapore's humidity, plus bathroom and kitchen steam, keeps concrete damp. A leak from the floor above makes it much worse, which is why spalling is so common on bathroom and kitchen ceilings. If a leak is feeding the area, it needs water leakage repair first, or the new patch will fail.
Thin cover and age
Where the concrete cover over the steel is thin, carbonation and moisture reach the steel sooner. Ageing HDB ceilings, particularly in bathrooms, kitchens and service yards of older flats, are where spalling shows up most often.
Step By Step
HOW SPALLING CONCRETE IS REPAIRED
- Make safe. Remove anything about to fall, protect the room and furniture, and set up dust control.
- Hack off loose concrete. All cracked, hollow and loose concrete is removed back to sound material, and far enough around the steel that the whole rusted length is exposed.
- Treat the steel. Rust is cleaned off the reinforcement and an anti-corrosion primer is applied. If a bar has lost a lot of its section, it may need extra steel, and that is when an engineer's view matters.
- Bonding agent. A bonding coat is applied to the prepared concrete so the repair material sticks properly.
- Polymer-modified repair mortar. The profile is rebuilt in layers with a repair mortar designed for this job, then left to cure.
- Finish. Skim coat, sanding and painting to match the surrounding ceiling, with a protective coating where it is useful.
If the cause is a leak, the source is repaired first. Our guide to concrete spalling in HDB flats and condos explains the warning signs and how to tell spalling from ordinary cracks.
Who Pays
HDB, CONDO AND LANDED RESPONSIBILITY
| Property | Who usually handles it |
|---|---|
| New HDB flat | Defects found during the defects liability period are reported to HDB for rectification. |
| Older HDB flat | Spalling repair is one of the essential works under the Home Improvement Programme for eligible flats, and HDB has offered repair assistance for spalling in older flats. Outside those, repairs inside the flat are generally the owner's responsibility. Check HDB's current scheme and eligibility before booking. |
| HDB common areas | Spalling in corridors, staircases and external walls is reported to the Town Council. |
| Condominium | The MCST generally handles common property such as external walls, corridors and the roof. Spalling inside a unit may be the owner's or shared, depending on the strata plan and by-laws. Ask the managing agent first. |
| Landed home | The owner is responsible. |
Where spalling has damaged a ceiling finish or false ceiling, we can handle the ceiling repair in the same visit. For beams, columns or widespread damage, see structural rectification.
Our Process
HOW WE DELIVER RESULTS
01
Inspection
Assess extent of spalling, test concrete strength, and identify affected areas.
02
Concrete Removal
Remove loose and unsound concrete to expose clean substrate.
03
Steel Treatment
Clean corroded reinforcement and apply rust converter and protective primer.
04
Bonding Application
Apply bonding agent for proper adhesion of repair material.
05
Repair Mortar
Apply polymer-modified repair mortar in layers to required profile.
06
Protective Coating
Apply anti-carbonation coating for long-term protection.
FAQs
FREQUENTLY ASKED QUESTIONS
What causes concrete spalling?
Concrete spalling is primarily caused by corrosion of embedded reinforcement steel. Contributing factors include water ingress, carbonation, chloride contamination, and inadequate concrete cover.
Is concrete spalling dangerous?
Yes, spalling can be dangerous. Falling concrete pieces pose immediate hazard, and continued deterioration weakens structural elements. Repair should not be delayed.
How long does spalling repair last?
Properly executed spalling repairs with quality materials typically last 15-20 years or more, especially with protective coating application.
Do you handle large-scale spalling repairs?
Yes, we handle projects of all sizes from single areas to building-wide repairs. Large projects may require PE endorsement which we can arrange.
Does HDB pay for spalling concrete repair?
It depends on the flat and the scheme in force. Defects in a new flat are covered during the defects liability period, spalling repair is part of the essential works under the Home Improvement Programme for eligible older flats, and HDB has offered repair assistance for spalling in older flats. After that, repairs inside the flat are generally the owner's responsibility. Check HDB's current scheme for your flat before booking.
Can I just plaster over spalling concrete?
No. Plaster or skim coat over rusting steel traps the corrosion, and the steel keeps expanding until the patch cracks and falls again. The loose concrete has to be removed and the steel treated first.
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