Waterproofing Elevator Pits: Why and How?

Elevator pits aren’t immune to structural issues—no concrete structure is. While concrete is a durable material, it can still crack and allow water intrusion over time. Many commercial buildings have elevator pits that may experience this kind of damage during their lifespan. In this article, we’ll explore common signs of damage and explain why waterproofing an elevator pit is a smart, long-term solution.

Signs of Damage to Elevator Pits

• Visible Cracks in Concrete Walls or Floor: Cracking in the concrete is often the first sign of structural stress or settling. These cracks can allow water to seep into the pit, leading to further deterioration if left unaddressed.
• Standing Water or Damp Surfaces: Persistent moisture or pooling water in the elevator pit is a clear indicator of water intrusion. This can be caused by groundwater pressure, poor drainage, or cracks in the surrounding concrete.
• Rust or Corrosion on Metal Components: Elevator equipment housed in the pit, such as guide rails or support beams, may begin to rust or corrode due to high humidity or direct water exposure. This not only affects performance but can lead to costly repairs or replacements.
• Musty Odors or Mold Growth: The presence of mold or a musty smell indicates long-term moisture issues. Mold thrives in dark, damp environments like elevator pits and can pose health risks to building occupants.
• Efflorescence on Concrete Surfaces: A white, chalky residue on the walls or floor may be a sign of efflorescence, which occurs when water seeps through the concrete and brings salts to the surface. This signals that water is moving through the structure.
• Malfunctioning Elevator Equipment: If the elevator experiences slow response times, grinding noises, or irregular operation, it could be due to moisture affecting mechanical or electrical components in the pit.
• Leaking Hydraulics: Elevator pits are notorious for having leaking hydraulics in them. If ground water is getting in, it’s likely that oils and contamination are getting out. This means potential environmental concern will be highlighted in the event the property is ever sold.
• Increased Pest Activity: Damp and unsealed elevator pits can attract insects or rodents, which are drawn to moisture. Pest presence may point to larger water intrusion issues.

When elevator pit damage is caused by water intrusion, sealing the structure is often the most effective way to restore integrity and prevent future issues. One of the most efficient and long-lasting solutions available is polyurethane injection.

Elevator Pit Sealing with Polyurethane Injection by USG

Sealing an elevator pit with polyurethane involves injecting a specially formulated expanding polymer into cracks, joints, or voids where water is entering. Once injected, the polyurethane reacts with moisture and begins to expand, filling gaps and creating a watertight barrier. This material bonds well to concrete, even in wet conditions, and cures quickly to form a durable, flexible seal that resists future water intrusion. Because the process is non-invasive and doesn’t require excavation, it’s an efficient solution that minimizes downtime and disruption to building operations.

Why USG?

Utility Services Group has the experience, equipment, and expertise needed to handle elevator pit waterproofing with precision and care. Our team specializes in non-invasive polyurethane injection methods that stop leaks at the source—without the need for excavation. We understand the importance of protecting sensitive mechanical areas like elevator pits, and we take pride in completing every job with minimal disruption, long-term durability, and professional service. When you work with USG, you can trust that the repair will be done right. We are the intersection of People, Safety, Service, and Technology.