Rats only need a gap the size of a £1 coin to enter homes, but a common supermarket item costing just 36p can stop them, according to property and pest control experts. With summer heatwaves driving rat activity to peak levels in the UK, homeowners are being urged to seal entry points using wire wool – a cheap and effective barrier that rodents cannot gnaw through.
Why Summer Increases Rat Activity
Saif Derzi, award-winning property expert and founder of Property Buyers Today, explains: "Hot weather often forces rats out of drains, sewers and underground burrows as they search for food and water. At the same time, gardens become more attractive thanks to barbecues, food waste and accessible water sources." He adds: "People tend to associate rat problems with autumn and winter, but summer is often when populations expand, and infestations begin."
UK searches for 'how to get rid of rats in garden' have increased by 50% over the past week alone, reflecting growing concern among homeowners.
The 20mm Gap Misconception
Many people assume rats need a large hole to enter a property, but Derzi notes: "The biggest mistake people make is assuming rats need a large opening to get inside." In reality, rats can squeeze through gaps of around 20mm – roughly the diameter of a £1 coin. Common entry points include gaps around pipes and cables, damaged air bricks, cracks in walls and foundations, and broken drains or drainage systems.
The 36p Wire Wool Solution
Wire wool, also known as steel wool, is a robust material that rats and mice cannot chew through. Its pliability allows it to fill even the smallest gaps, acting as a physical barrier. A pack of three wire wool pads at Asda costs £1.08, working out at just 36p per piece.
John Horsley, Technical Officer at the British Pest Control Association, says: "Wire wool is a great product when used correctly, but often requires covering with silicone, meaning it's better for smaller holes. I particularly like this for proofing door frame corners or small holes in the brickwork. It can be more discreet than a metal plate, and using silicone over the top helps it stay in place, preventing it from being removed by rodents or anyone else."
Once wire wool is placed, experts recommend applying a sealant such as cement, caulk or expanding foam to make the seal airtight and permanently ward off rodents.
Safety Warnings and Professional Help
Wire wool is highly combustible and must not be used in areas with high temperatures, near exposed wiring, or where there is a high static charge or intense heat, as it can easily catch fire. Property expert Saif Derzi advises: "Small gaps around pipes and cables can often be sealed using wire wool and cement or specialist expanding foam, while damaged air bricks should be fitted with metal mesh covers that maintain ventilation while preventing access."
For active infestations, professional pest control help should be sought, as DIY solutions may not address the root cause of the problem. The British Pest Control Association recommends contacting a certified pest controller for severe cases.
