Cockroaches Carry Faecal Contamination

Cockroaches are among the most undesirable household pests. Their adaptability and rapid reproduction make them difficult to eliminate, so prevention is essential. Learn how they enter an apartment and how to prevent them from becoming established.

7/8/2026

Seeing a cockroach indoors is often a sign that a larger population may be hiding nearby. Cockroaches are not merely unpleasant to look at. They may also carry bacteria, allergens and particles of faecal matter that can pose a risk to human health. Because they reproduce quickly and hide extremely well, early detection and effective cockroach control are essential for maintaining hygiene and safety in the home.

Many people assume that cockroaches simply appear, but in reality we often bring them in or unintentionally provide them with a route indoors. Understanding how they enter the home can help keep them outside, prevent an infestation and avoid the unpleasant experience of finding one on the kitchen worktop or even in the bedroom.

Do Cockroaches Enter Through Cracks, Pipes and Drains?

Their flattened bodies allow cockroaches to squeeze through extremely narrow openings. A gap of approximately 1.5 mm may be sufficient. They most commonly enter through cracks in walls and floors, openings around plumbing and other service installations, and poorly sealed door and window frames. Because they frequently inhabit sewer pipes and drains, they may also enter living areas through traps and drainage systems.

Regular drain cleaning and the use of protective screens and non-return valves can reduce the risk of entry.

Cockroaches in Packaging: How They May Be Brought Home?

Cockroaches can be brought into the home in cardboard boxes, packaging, shopping bags, second-hand furniture and other objects stored in infested premises. Eggs and developing stages may be hidden in cracks, cardboard folds and other hard-to-see locations, making them easy to miss during a superficial inspection.

Carefully inspect items from unknown or potentially infested environments before bringing them indoors.

Cockroaches in Apartment Buildings: Movement from Neighbouring Units

In multi-residential buildings, cockroaches can spread rapidly from one apartment to another through plumbing and heating systems, ventilation shafts and installation openings. The problem is therefore often not limited to a single unit. If cockroaches appear in one apartment, they may soon spread to neighbouring homes and common areas.

Successful control may require coordinated action by residents and regular cleaning and maintenance of shared spaces such as basements, corridors and service shafts.

Ventilation Systems: A Hidden Entry Route

Ventilation grilles, air vents and shafts are frequently overlooked entry routes. Cockroaches can move through ventilation systems between rooms or even apartments, eventually reaching kitchens, bathrooms and other warm, humid areas that provide favourable conditions for survival.

Inspect and maintain ventilation openings regularly and fit them with a fine protective mesh that prevents cockroach entry without obstructing airflow.

Effective Protection Against Cockroaches

Prevention is always the best defence. Sealing cracks and openings, cleaning drains regularly, inspecting cardboard packaging and maintaining ventilation systems can greatly reduce the likelihood of cockroaches entering the home. This helps avoid an infestation, the associated inconvenience and the cost of more demanding control measures.

At the first signs of cockroach activity, act immediately. For a rapid reduction in the active population, use Effect Universal PRO or Effect Ultimum PRO. Effect Universal PRO is ready to use, while Effect Ultimum PRO must be diluted with water according to the product label. Thoroughly treat cracks, crevices, wall edges, areas beneath kitchen units, around drains and other locations where cockroaches hide or travel.

For long-lasting protection, use Effect Microtech CS PRO RTU. Its advanced microencapsulated formulation provides rapid initial action and protection of treated surfaces for up to 6 months. The microcapsules release gradually and remain active considerably longer than conventional insecticides, helping protect hard-to-reach areas where cockroaches often hide.

After insecticide treatment, place Effect Cockroach Trap in areas where activity was previously observed. The traps help monitor any remaining activity and provide early warning of a renewed infestation, making them a useful part of a comprehensive cockroach-control programme.

  • Effectively attracts and traps cockroaches.
  • Insecticide-free.
  • Safe for indoor use.
  • Effective monitoring of cockroach activity.
  • Easy and clean to use.

By combining rapid control, long-term residual protection and correctly positioned traps, you can effectively reduce cockroach populations and help prevent their return.

Use biocides safely. Always read the label and product information before use.