The Most Ignored Part of Multistoried Buildings – Expansion Joints

How to Fix Leaking Expansion Joints the BPChem Way

When we talk about the health of multistoried buildings, attention usually goes to visible aspects—paint, plaster, or plumbing. But the most ignored and underrated element is the expansion joint. Ironically, this “gap” is not a defect—it is an essential design feature. Expansion joints allow a building to breathe, expand, and contract under temperature changes, wind loads, and seismic movements. When neglected, however, these very joints become the weakest point for water ingress, structural deterioration, and safety risks.

Why Expansion Joints Leak?

1. Aging of Sealants – Conventional sealants lose elasticity over time, leading to cracks and water pathways.
2. Improper Design & Detailing – Many builders underestimate the width, depth, and reinforcement needs of joints.
3. Poor Workmanship – Unskilled filling, lack of backer rods, or absence of waterproofing membranes.
4. Thermal Stresses – Constant contraction and expansion make untreated joints brittle.
5. Lack of Periodic Maintenance – Out of sight, out of mind—until seepage shows up inside walls or basements.

Risks of Ignored Expansion Joints

• Basement Flooding – Rainwater and groundwater seep through joints.
• Structural Damage – Corrosion of rebars, concrete delamination, and reduced load-bearing capacity.
• Aesthetic Damage – Damp patches, peeling paint, and efflorescence on walls.
• Health Risks – Mold growth due to seepage affects indoor air quality.

The BPChem Way of Repairing Expansion Joints

At BPChem, the waterproofing and repairs division of BPT Group, we treat expansion joints not just as gaps to be filled—but as critical life lines of a building’s durability.

Step-by-Step Professional Methodology

1. Assessment & NDT
2. Removal of Old Sealant & Debris
3. Backer Rod Placement
4. Application of Primer
5. Joint Filling with Elastomeric Sealant
6. Waterproof Membrane Reinforcement
7. Protective Elastomeric Coating
8. Testing & Certification

Why Choose BPChem Expansion Joint Repairs?

• Proven Track Record – Hundreds of multistoried projects across residential, commercial, and industrial sectors.
• Science + Experience – Every solution is technically backed by civil engineers and waterproofing consultants.
• End-to-End PMC Approach – From diagnosis to repair to preventive maintenance.
• Sustainability Focus – Use of eco-friendly sealants and coatings under the BPT Green Warrior Initiative.
• Guaranteed Performance – Up to 10 years warranty with BPChem guarantee letters.

Expansion joints may look like small, insignificant gaps, but they are critical to the safety, strength, and sustainability of multistoried buildings. A leaking expansion joint today is a structural disaster tomorrow. With the BPChem way, you don’t just repair a joint—you restore confidence in your building’s future.

At BPT Group – BPChem Division, we make sure your building breathes freely, stands strong, and stays leak-free for years to come

Dr Balaji Roshan Singh

Founder & CEO

BPT Group