If you've been up into your loft and found insulation pulled into loose mounds, shredded into pieces, or missing altogether from patches of the roof space, squirrels are the most likely culprit. This isn't random destruction – it's purposeful nesting behaviour, and understanding why it happens helps explain why the timing so often lines up with certain times of year.
Squirrels Use Insulation to Build Nests
In the wild, grey squirrels build nests known as dreys from leaves, twigs and bark, usually high in tree branches. Inside a loft, insulation is a warm, soft, readily available substitute, and squirrels will happily pull it apart and pack it into corners or against joists to create a nesting site, particularly ahead of breeding.
Signs the Damage Is Nest-Building, Not Just Passing Through
- Insulation pulled into distinct piles or mounds rather than scattered evenly
- Shredded material concentrated in one corner or area of the loft, often near an entry point
- Missing or thin patches of insulation where material has been removed entirely
- Nesting material mixed in – twigs, leaves or bark alongside the shredded insulation
The Cost Beyond the Mess
Damaged and displaced insulation doesn't just look untidy – it stops doing its job properly. Compacted, thinned or soiled insulation has significantly reduced thermal performance, which can mean noticeably higher heating bills over winter. Droppings and urine contamination can also become an issue where nesting has been established for a while, which affects both insulation performance and loft hygiene.
Why This Tends to Peak at Certain Times of Year
Grey squirrels typically have two breeding periods a year, with litters often born in late winter and early spring, and a second litter possible in mid to late summer. Nest-building activity, and the associated insulation damage, tends to increase in the run-up to these periods as squirrels prepare a suitable, sheltered spot to raise young – which is worth bearing in mind if you notice damage appearing seasonally rather than as a one-off.
If squirrels have been shredding insulation in your Woodley loft, contact Pest Services Berkshire on 0118 336 1366. We'll confirm the extent of the nesting activity, remove the squirrels safely, and advise on whether the affected insulation needs replacing.
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