Rats in the loft are a worrying sign for any homeowner due to their propensity to spread disease, damage property and steal food. Worse, rodents in the loft indicate that they have spread deep into the property, forming a network throughout your walls. To deal with rodents it is can be useful to first identify the type of rodent before addressing structural issues and then dealing with the rodents themselves.
Types of Rodent
In the UK, the most common type of rat is the brown rat, followed by the black rat a distant second. As omnivores, these rats will consume nearly anything and are fond of burrowing; hence, in urban areas they will enter properties for shelter and warmth, which usually occurs at the end of the summer and autumn when the weather starts to turn. Of the two, the black rat is incredibly agile and can often be found inhabiting the upper areas of buildings, while the brown rat is more likely to stick to lower levels.
The two rats can be distinguished by their length, weight, body proportions and facial features with the brown rat significantly larger (40 vs 24cm long) and heavier (500 vs 200g) with small ears and eyes and a slanted snout. By contrast, the black rat possesses large ears and eyes and a pointed snout. Unsurprisingly, its body is slender with its tail longer than the rest of its body, hence the difference in weight. The brown rat is the opposite with a thick body and tail shorter than the rest of its body.
Of mice, the most common species found in UK homes is the house mouse followed by the closely related field and yellow-necked field mouse. The house mouse is particularly problematic as it can enter dwellings at any point of the year. Concentrated in rural areas, the field mouse will rarely enter homes, although may pose a problem to farm buildings. The house mouse can easily be distinguished from the field mouse by its colour with the former grey and the latter a sandy-orange.
Significantly smaller than rats, mice can survive on a mere 3 grams of food a day and even go without water for significant periods. They are all excellent climbers and can multiply quickly. The house mouse, for example, can produce up to 8 litters a year with a gestation period of only 30 days. Hence, we recommend you act quickly to solve any rodent problem.
Rodents carry a wide range of diseases, some of which are deadly and others airbourne. Hence, other than wearing gloves and using a facemask, we recommend you air out any space before removing carcasses or excrements.
Rodents are usually identified by their droppings or the sound of crawling, scratching and gnawing, although can also be identified by chewed wires or pipes. In general, rats are more audible than mice and you are less likely to hear the latter crawling. Brown rat’s droppings are the largest between 1.5-2cm, black rat’s up to 1.5cm and mice less than 0.75cm. If you are having trouble locating your intruders, you can use rodent tracker dust to identify their comings and goings and aid trap placement.
Addressing Structural Issues
Rodents, along with other pests, can enter your property through small cracks in the brickwork. They can enter your property through climbing shrubs and trees, and black rats may enter your loft directly. Hence, we recommend you seal any cracks with insulation foam and cut back overgrown plants. Rodents will often first take interest in a home due to overgrown gardens and easy access to waste. Hence, it is important to keep your rubbish tidied away.
Primrose has over 10 years’ experience developing pest control products and offers a large range of solutions to rodent infestations, divided into clinical and humane solutions. Of all our products, we’d recommend ultrasonic repellents. They work by emitting ultrasound waves, inaudible to humans, but painful for rodents, who use this frequency to listen for predators. Disturbed, they will move out of the vicinity of the sound. We offer both battery and mains powered repellents, of which the former can be useful if you do not have a socket in your loft.
Clinical solutions include mouse and glue traps. In the vast majority of cases a mouse trap will kill a rodent instantly, so they are humane in a sense. Glue traps are extremely effective and work great in tandem with conventional traps. However, the major problem with clinical solutions is that they rarely provide a long term solution as killing existing rodents simply makes room for new ones. Hence, we recommend you start with any ultrasonic repellent, before moving onto these solutions.
If you are using ultrasonic repellents, it is important to first give it time to work and then seal cracks in your property to allow room for the rodents to escape. If you plan to just use just clinical solutions, it is important to first seal your property. Ultimately, it can be useful to use all three solutions in tandem that have proven to be highly effective in dealing with the worst problems, and significantly cheaper than relying on professional pest control solutions.
Jorge works in the Primrose marketing team. He is an avid reader, although struggles to stick to one topic!
His ideal afternoon would involve a long walk, before settling down for scones.
Jorge is a journeyman gardener with experience in growing crops.