Timber damage is the part of a squirrel problem that worries people most and, in most Ipswich roofs, matters least. It is worth separating the alarming from the significant.
What gets gnawed, and why
Squirrel incisors grow continuously and have to be worn down. Softwood is a convenient material for that: firm enough to be worth working, soft enough to give way. So gnawing on timber is routine rather than purposeful — it is not an attempt to get anywhere.
- Rafter edges, particularly the arrises, where an edge gives a purchase
- Battens, which are small-section and easy to work
- Joist tops, along running routes
- Loft boarding and its edges
- Trusses at their junctions, where the timber is already cut
- Purlins and wall plates, at the eaves where the animal enters
What is cosmetic
Most of it. Surface gnawing on the face or arris of a rafter or a joist — a few millimetres deep, over a small area — removes an insignificant fraction of the section and does not affect how the roof carries load. It looks worse than it is, and it does not need repairing for structural reasons.
What is not
- Damage at a joint or a bearing. Where a rafter sits on a wall plate, or a truss member meets another, the timber is already reduced and the loads are concentrated
- Anything near a truss plate. Modern trussed rafters rely on toothed plates at every joint; timber loss around one is not a small matter
- Deep or repeated work in one place, particularly on a small-section member
- Damage combined with damp. Gnawed timber that has also been wet is a different conversation, because decay follows moisture
The rule of thumb: where it is matters more than how much. A centimetre off the middle of a rafter is nothing. A centimetre off a truss joint is worth a builder's opinion.
Ipswich roofs, old and new
The town has a wide range of roof construction. Older properties tend to have cut roofs — individual rafters, purlins and generous timber sections, which tolerate surface damage well. Post-war and modern housing more often has trussed rafters: efficient, much lighter in section, and dependent on their plated joints.
That is the practical difference. In an older roof, gnawing is nearly always cosmetic. In a trussed roof it is worth looking at where the gnawing actually is before dismissing it.
What to do about it
Photograph anything that looks deep or is close to a joint, and get a builder or surveyor to look at those specific points once the activity has been dealt with. Surface marks elsewhere can be left alone. Treat gnawed timber that has also been damp as the more urgent of the two.
Questions
Can gnawing weaken a roof?
In the wrong place, yes — at joints, bearings and small-section members. Surface damage in the middle of a rafter is not a structural issue.
Should gnawed timber be treated?
Where it has been damp, yes, because decay follows moisture. Dry surface gnawing generally needs nothing.
How do I know if my roof is trussed?
Trussed roofs have repeated W-shaped frames of light timber with metal plates at the joints. Older cut roofs have heavier individual rafters and purlins.
Squirrel Control Ipswich
Squirrel control in Ipswich is £280 fixed cost. Proofing work, where it is needed afterwards, is £180. Call 01502 630 122 and tell us what you have heard or seen.
For squirrel control in Ipswich, call 01502 630 122, or read the Ipswich squirrel control page.