Barrier Method

The barrier method is the use of physical or procedural barriers to prevent contamination, cross-contact or unwanted interaction between people, food, equipment and the environment. In foodservice, barriers may separate raw and ready-to-eat foods, protect exposed food from customers, or prevent allergen transfer during preparation.

Examples of barrier controls

• Physical barriers: sneeze guards over buffet food, lids on containers and partitions that protect exposed food.
• Separate work areas: designated areas or sinks for specific high-risk tasks when required by the operation’s risk assessment.
• Dedicated equipment: utensils, containers or appliances reserved for a particular food or process.
• Packaging: sealed containers and protective wraps that prevent contact during storage and transport.
• Procedural barriers: controlled sequencing, handwashing, cleaning and sanitizing between tasks.

Barrier method in food safety

A barrier should be selected for the hazard it is intended to control. For example, a sneeze guard helps protect food from droplets and direct contact, while separate equipment may reduce allergen cross-contact. Gloves are not a barrier by themselves: they can transfer contamination just like hands if they are not changed appropriately and combined with proper hand hygiene.

Barrier method versus segregation

Segregation separates foods, ingredients or processes. The barrier method describes the controls used to maintain that separation, which may be physical, procedural or both. Effective systems often use multiple barriers rather than relying on one measure.

Chef’s tip: identify the specific hazard first, then choose a barrier that actually controls it. Verify the barrier during service and replace or clean it when it becomes damaged or contaminated.