Part 1: The Importance of Grease Containment

Fats, oils and grease, from the hood exhaust fan on top of restaurants and other commercial cooking operations, collect on the roof and form pools. Pools of grease can lead to a long list of problems. Grease containment helps prevent grease from pooling by collecting and containing it.

How does grease containment prevent accidents?

Slips and falls are the most frequent injury to food service staff. Grease on a roof can create a huge slipping hazard for staff and maintenance professionals. This is a significant safety hazard and creates a liability. Grease containment can prevent a slippery roof and accidents associated with pooling grease.

How does grease containment help ensure a long-lasting roof?

Grease pooling can be harmful to almost any type of roof. It can cause roof material deterioration, leaks, health code violations, insect infestation, runoff water pollution, fires, and employee safety concerns. Grease sitting on a rooftop can cause the roof material to become soft and spongy. Seam adhesives may also lose some of their bonding strength and cause seams to burst, leading to a roof failure. The best way to prevent roof damage is to prevent grease from ever touching the roof.

Many grease containment systems involve a large bin made of leak proof material, some also contain filters that absorb and trap grease for easier maintenance and disposal. These systems ensure that little to no grease escapes to deteriorate the roof material and can help achieve EPA health code compliance.

What difference does an off the roof system make?

On the roof systems can be dangerous because they trap a hidden pool of grease directly on the roof material. This pool of grease saturates the roof membrane and creates optimum conditions for roof deterioration. They also may need to be dismantled for inspection.

However, off the roof systems like the Roof Guardian sit two inches off of the roof and allow access underneath. This allows for full inspection of the entire roof without any dismantling of the containment system. Even though 2 inches may not seem like much it gives plenty of clearance to visually inspect the roof underneath the containment system and does not trap grease against the roof. These two inches of visual clearance could be the difference between zero maintenance and an expense of thousands of dollars to replace a roof membrane.

What impact do health codes have on wastewater?

Restaurant fats, oils and grease cause a significant amount of wastewater. Wastewater from restaurants and other commercial food service facilities is different from residential wastewater. Restaurant wastewater typically has higher levels of fats, oils and grease. There is also a much larger amount of it produced daily.

A problem occurs when fats, oils and grease liquefy at the high water temperatures used to wash dishes, because they later solidify in sewer lines. The Environmental Protection Agency (EPA) has created national regulatory standards for wastewater. These health codes limit the amount of wastewater coming from each restaurant or other commercial cooking operations. The EPA has many regulations that vary by region to lessen the amount of pollutants that are emitted in order to help preserve our environment. Grease containment can aid in increasing EPA health code compliance by keeping grease off the roof.

Part 1: The Importance of Grease Containment

Omni Containment Systems

< Older Post

Newer Post >

Share This Blog Post!

How Hydrophobic Filters Improve Environmental Compliance

28 May 2026

Discover how hydrophobic grease filters improve rooftop greases containment, reduce stormwater pollutions, support EPA compliance, and lower maintenance costs for commercial kitchens.

Grease Containment & the Environment: How Your Rooftop Impacts Local Water Systems

23 April 2026

When people think about environmental responsibility in commercial kitchens, they usually focus on what goes down the drain. But one of the most overlooked sources of pollution isn’t inside your facility, it’s on your roof. Rooftop grease runoff from kitchen exhaust systems can have a direct and damaging impact on local water systems, storm drains, and surrounding ecosystems. Without proper containment , that grease doesn’t just disappear, it travels. From Rooftop to Waterway: How Grease Becomes Pollution Commercial kitchen exhaust systems are designed to remove heat, smoke, and airborne grease particles. While hood filters capture some of that grease, a significant amount still passes through the system and accumulates in ductwork and exhaust fans. Over time, this buildup begins to drip onto the roof, spread across roofing materials, and get carried away by rainwater. Once rain hits your roof, it acts as a transport system, moving grease into gutters, downspouts, and ultimately into storm drains. Unlike sanitary sewer systems, stormwater runoff is often discharged directly into local waterways without treatment. As a result, grease from your rooftop can end up in rivers, lakes, municipal stormwater systems, and surrounding soil. Why It Matters: Environmental and Operational Risks The impact of rooftop grease runoff extends beyond a messy roof; it creates real environmental and operational concerns. Grease contains fats, oils, and contaminants that can degrade water quality. When introduced into natural water systems, it can harm aquatic life, disrupt oxygen levels, and contribute to long-term ecosystem damage. At the same time, regulatory compliance is at risk. Local and federal requirements , often tied to EPA stormwater guidelines, mandate that facilities prevent pollutants from entering storm drains. Uncontrolled grease runoff can lead to fines, failed inspections, and increased scrutiny. There are also direct impacts on your facility. Grease buildup can deteriorate roofing materials, void warranties, and create slip hazards for maintenance personnel. What begins as a rooftop issue can quickly escalate into a costly problem. The Role of Grease Containment Systems A properly designed grease containment system serves as a critical barrier between your exhaust system and the environment. Instead of allowing grease to spread across the roof, these systems capture it at the source, right at the exhaust fan's discharge. Filtration media absorbs and holds the grease, preventing runoff during rain events and reducing the risk of environmental contamination. More advanced systems incorporate multi-stage filtration, improving efficiency while reducing maintenance frequency. The result is a cleaner, safer, and more controlled rooftop environment. Sustainability Starts at the Source Environmental responsibility isn’t just about compliance; it’s about prevention . By addressing grease at the rooftop level, facilities can reduce their environmental footprint, support local water quality initiatives, and align with broader sustainability. For multi-site operators and property managers, this becomes even more important. A single poorly managed rooftop can impact not just one building, but an entire property, or even the surrounding community. Best Practices for Preventing Rooftop Grease Runoff Preventing grease runoff doesn’t require a complete overhaul, but it does require consistency and the right approach . Start by installing a high-quality grease containment system designed for durability and ease of maintenance. From there, regular maintenance is key. Filtration media should be inspected and replaced as needed to ensure the system continues performing effectively. Routine rooftop inspections can help identify buildup early, before it becomes a larger issue. Finally, working with experienced professionals ensures proper system selection and installation, setting up the foundation for long-term performance. A Small Change with a Big Impact Grease containment may seem like a small part of your operation, but its impact extends far beyond your rooftop. By taking proactive steps to manage grease runoff, you’re not only protecting your building, but you’re also helping protect your local environment and water systems. Looking to improve your rooftop grease management? Omni Containment Systems provides innovative solutions designed to keep grease where it belongs, off your roof and out of waterways.