Rats chew through expanding foam to access wall cavity.
Some materials are good for proofing against rodents and some provide a temporary seal at best.
This photo shows a large gap around cables which had been sealed using expanding foam. This may be an effective insulation but it will not prevent rodents from accessing the wall cavity and potentially other areas of the building. This was the case here where rats were able to gain access into several areas of the building once inside the wall cavity.
We had been informed that wire mesh had been inserted around the cabling prior to the expanding foam being used, but this proved to be incorrect, leaving the site vulnerable to rodent ingress. Treatments followed to remove the rats from the building, the expanding foam was cut out and the brickwork was then sealed up properly.
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