When a Cockroach Comes into the House from a Service Shaft

When a cockroach, or something resembling one, appears in a living or working environment, the immediate reaction is usually to remove the visible insect and prevent any unseen individuals from moving and reproducing.

7/8/2026

During summer, an individual cockroach may enter a house from a sewer shaft, basement or shared service installation. It may appear to be an isolated incident, but even one visible cockroach can be a warning that a larger population is hiding nearby. Cockroaches are mainly active at night and remain concealed during the day in cracks, crevices and other hard-to-reach places, so they are often noticed only after their numbers have increased.

They prefer warm, humid environments with easy access to food and are therefore most frequently found in kitchens, bathrooms, basements, pantries, warehouses and other heated premises. On warm summer evenings, they may move from the drainage system into nearby residential buildings.

If you see a cockroach in your home, act promptly. Early intervention is considerably easier and more effective than controlling an established infestation.

What Should You Do?

Determine Whether It Is an Isolated Cockroach or the Start of an Infestation

If you find one cockroach, inspect the locations where they most commonly hide:

  • beneath kitchen units,
  • behind the refrigerator and dishwasher,
  • around drains and pipes,
  • in cracks and crevices,
  • in basements, pantries and other warm or humid rooms.

If you observe several cockroaches or repeatedly see them at night, a larger population is likely to be present nearby.

Reduce the Population Quickly

At the first signs of cockroach activity, carry out a rapid insecticide treatment.

Effect Universal PRO is suitable for immediate use and provides fast contact action without preparing a working solution.

When larger surfaces need to be treated, use Effect Ultimum PRO. Dilute the concentrate with water according to the label and apply the solution to common hiding and movement areas.

Pay particular attention to cracks, crevices, wall edges, areas beneath kitchen units, around drains and other hard-to-reach locations.

For best results, treat all areas where cockroaches are likely to hide or move and always follow the instructions on the product label.

Effect Universal PRO

Then Provide Long-Term Protection

After the initial treatment, use Effect Microtech CS PRO RTU.

Its advanced microencapsulated formulation provides rapid contact action and protection of treated surfaces for up to 6 months. The microcapsules release gradually after application, allowing the product to remain effective considerably longer than conventional insecticides.

Treat especially:

  • cracks and crevices,
  • floor and wall edges,
  • areas behind kitchen units,
  • spaces around pipes and service installations,
  • other hard-to-reach hiding places.
Effect Microtech CS PRO RTU

Monitor Any Remaining Activity

After treatment, place Effect Cockroach Trap where cockroaches were previously observed.

The traps should be positioned in areas where cockroaches are most likely to occur, particularly in dark, warm and damp areas and near food sources, such as beneath kitchen units, beside refrigerators or in corners where food is stored.

As the product contains no active insecticidal substances, it is suitable for use in the home, including areas used by children or pets. The enclosed adhesive trap provides clean, simple and discreet application without spraying or additional product preparation.

The traps help monitor remaining activity and provide early detection of renewed cockroach presence. They are a useful complement to a comprehensive treatment programme.

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When Is Professional Assistance Required?


For severe infestations, professional pest-control technicians may use ultra-low-volume (ULV) application or space treatment to reduce the active population rapidly. Because space treatment alone usually provides little residual protection, professionals combine it with residual insecticides, monitoring and other measures that prevent reinfestation.


Combine Measures for the Best Results

Successful cockroach control requires timely action, appropriate hygiene and correctly selected control products.

For best results, use the following sequence:

Combining rapid control, residual protection and regular monitoring can substantially reduce cockroach populations and help prevent them from returning.


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