Service life and upkeep
Birds and Pests Under a Roof: Proofing the Eaves and Verges
Birds and squirrels enter a roof through gaps at the eaves and verges that were never meant to be open, and closing those gaps has to be done without closing the ventilation path that shares them. Download the schedule for the eaves and book a survey when a step needs a ladder. The scope here: Eaves gap · Verge · Ridge.
Birds and squirrels enter through gaps at the eaves and verges that were never meant to be open. The eaves gap serves the airflow inlet as well, so closing one must not close the other.
- The eaves gap
- An eaves comb — a profiled filler closing the gap while permitting the designed airflow.
- The verge
- Mesh, used at verges and irregular openings where a comb does not fit.
- Beneath the ridge units
- Neither a comb nor mesh answers this one. The opening closes when the units are refixed.
What is getting in, and when it can be closed
- Starling Nests in eaves cavities and returns to the same site annually.
- Pigeon Roosts on flat areas and in open eaves, fouling and blocking outlets.
- Grey squirrel Enlarges existing gaps, damages timber and insulation, and gnaws cabling.
- Nesting season Active nests of wild birds are protected during the season, so proofing is scheduled around it rather than done on demand.
Expanding foam and sealant are the common wrong answers: they close the air inlet along with the gap and turn a proofing job into a condensation problem. Squirrels enlarge what is already open rather than making new holes, which is why proofing works once the existing openings are found.
How do birds and squirrels get into a roof?
Three openings account for most entry: the gap at the eaves where the covering meets the roofline, failed mortar or missing units at the verge, and spaces beneath displaced ridge tiles. All three existed before the animal arrived.
How are the gaps closed?
Fit a profiled eaves comb along the wall head, mesh irregular openings at verges and abutments, refix or replace displaced ridge and verge units, and confirm the ventilation path remains continuous once everything is closed.
- Starling is nests in eaves cavities, returning to the same site annually.
- Roosts on flat areas and in open eaves, fouling and blocking outlets.
- The species of the grey squirrel are enlarges existing gaps, damages timber and insulation, and gnaws cabling.
Why can't you just seal the gap?
The eaves gap carries the roof void's air inlet as well as the pest entry. Sealing it with foam or mastic closes the ventilation path, and the roof then produces condensation instead of birds.
Active nests of wild birds are legally protected during the season. The solution of the eaves comb is a profiled filler closing the gap while permitting designed airflow. Mesh is used at verges and irregular openings where a comb does not fit.
When can proofing be carried out?
Proofing is scheduled outside the nesting season, because active wild bird nests are legally protected. Work planned in advance for autumn avoids both the legal constraint and the birds returning to an established site.
Blocking pest entry must not block the eaves air inlet. Damage is displaced units, soiled insulation, blocked outlets and gnawed cabling.
- The eaves gap serves both airflow and a pest entry.
What damage do they actually cause?
Nesting displaces units and blocks outlets, droppings soil and compact insulation, and squirrels gnaw timber and cabling while enlarging their access point. The entry gap also admits wind-driven rain year round.
- An eaves comb closes the gap, while permitting designed airflow.
- Active wild bird nests are legally protected during the season.
- Squirrels enlarge existing gaps, rather than creating new ones.
A gap that admits a bird admits water too.
What else the same gaps let in
Blocking pest entry with sealant or foam closes the air inlet and causes condensation — a fix that creates a worse fault. Active nests are protected during the season, so proofing is scheduled around it rather than done on demand.
Getting the roofline checked
They enlarge existing gaps rather than making new ones, so proofing works if the existing openings are found. A profiled filler is the correct component; expanding foam and sealant are the common wrong answers.
Eaves comb, and 5 more
- eaves comb
- verge
- wall head
- nesting season
- over-fascia vent
- airflow inlet
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