What is a pigeon deterrent strip (duivenjager)?

A pigeon deterrent strip, called “duivenjager” in Dutch, is a discreet strip or profile placed along the ridge — particularly on thatched roofs — that prevents pigeons and other birds from nesting in or picking at the covering. The strip keeps the upper covering tight and protects the roof from animal damage.

Types

Pigeon deterrent strips come in several forms:

• Spike strip — aluminium or wooden strip with closely set upward-pointing spikes
• Thatch ridge cap — an extra tightly bound top layer of thatch on the ridge
• Lead flashing — corrugated lead which is too slippery for claws
• Mesh netting — fine wire mesh stretched over the ridge
• Plastic spike strip — modern lightweight variant

Function

The deterrent strip serves several purposes:

• Bird deterrence — pigeons cannot land on the spikes or smooth lead
• Thatch protection — prevents birds from pulling out reeds for nest material
• Ridge sealing — adds an extra weather seal against wind and rain
• Aesthetics — gives a neat finish to the roof slope

Application

Pigeon deterrent strips are mainly used on:

• Thatched roofs — on top of the thatch beneath the ridge tile
• Tiled roofs in urban areas — where pigeons are common
• Heritage buildings — to keep stonework and masonry clean
• Stables and barns — to keep interiors free of droppings

Points of attention

1. Animal-friendly — spikes must not be sharp enough to injure birds
2. Maintenance — clear fallen leaves and seeds between spikes regularly
3. Combined with other measures — often paired with chimney netting
4. Local rules — protected townscapes may set requirements on visibility

Related terms

• Roof ridge
• Ridge tile
• Lead flashing
• Roof covering
• Thatched roof

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