Protection against pigeons and swallows, installed by rope access

Netting, spikes or wires? A comparison of bird barriers

There is no single barrier for everything. Netting closes off a whole space, spikes protect a narrow surface, wires suit places where the look must not change. The choice depends on whether you are dealing with pigeons or smaller birds, and on whether you want to close the space off or merely make landing impossible.

Pigeon netting: where it belongs and how we install it

Pigeon netting is the most reliable barrier wherever a whole opening needs closing rather than just an edge. We use UV-resistant polyethylene netting tensioned on a perimeter steel wire and anchored into the load-bearing structure, not into the thermal insulation.

We choose the mesh size according to the species. Pigeons call for a larger mesh, smaller birds for a denser one. An oversized mesh lets small birds inside where they get trapped, and that is exactly what we want to avoid.

• We match the net colour to the facade so it stands out as little as possible.
• Fixings are stainless, so no rust marks appear on the facade.
• Where access to the enclosed space is needed, we fit a zipped entry into the net.

Spikes against pigeons and against swallows

Pigeon spikes are not a tool for killing or injuring. They are blunt stainless wires on a base that stop a bird from folding its wings and settling. The bird approaches, finds no landing surface and moves on.

Density and the number of rows are decisive. A 15-centimetre ledge takes one row, a half-metre parapet needs three or four, otherwise the bird simply settles between them. We glue or screw the base depending on the surface, differently on sheet metal than on render.

DIY-store spikes usually fail not because they are bad, but because they are glued onto an uncleaned, greasy surface and drop off in the first frost. The surface must be degreased and dried first.

Pigeon netting for a balcony or loggia

A balcony or loggia is an ideal nesting site for pigeons, with a roof, shelter and quiet. The answer is netting tensioned around the perimeter of the opening, optionally combined with spikes on the railing. The net can be built so that the view and normal use of the balcony are preserved.

In an apartment block, work on an individual balcony is done from a rope from above, so we need neither to pass through neighbours' flats nor to erect scaffolding. Installing on one balcony takes hours rather than days.

Swallows and house martins: what is and is not allowed

The barn swallow and the house martin are protected animals in Slovakia under Act No. 543/2002 Coll. on nature and landscape protection. This means an occupied nest must not be damaged or removed without an exemption granted by the nature protection authority.

So on this type of job we offer two things: prevention, meaning barriers fitted outside the nesting season while nests are empty, and cleaning and disinfection of the surfaces beneath the nests. We do not remove occupied nests.

If you are unsure whether a nest is occupied or which rules apply to your building, contact the district office's environmental department. We are happy to wait for their position and plan the installation around it.

When to schedule it: the nesting season decides

Barriers make sense when they go up before the birds move in. The nesting season runs roughly from April to August, so the ideal time to install is from late summer to early spring. Anyone tackling it in May is usually dealing with an occupied nest rather than prevention.

With pigeons it is looser, as they nest almost year-round, but even there the best time is as soon as you notice the problem. The longer a spot is occupied, the more droppings there are to remove and the more the cleaning costs.

Pigeon droppings are not just an eyesore

Pigeon droppings are acidic and gradually attack the surfaces they sit on. On sheet metal and paint they cause corrosion, on render and stone they leave permanent stains, and in gutters and drains they form blockages that flood the roof in heavy rain.

The second dimension is hygiene. Dried droppings and nest material can carry agents of diseases transmissible to humans, such as ornithosis or histoplasmosis, as well as nest mites. That is why dry droppings should never be swept dry, as this raises dust.

Removing pigeon droppings and disinfecting

We clean and disinfect the surface before installation. We work wet so that no dust is released, collect and dispose of the contaminated material, and only then fit the barrier. Our operatives wear protective equipment including a respirator for this work.

• Damping the surface so dried droppings do not create dust.
• Mechanical removal of droppings and residual nest material.
• Washing the surface and applying disinfectant.
• Collecting and disposing of the waste, not dropping it from height.
• Fitting the barrier onto a clean, dry surface.

Bird scarers: what works and what is wasted money

Plastic owls, mirror discs, reflective tape and ultrasonic scarers share one property: birds get used to them. The effect lasts days or weeks, then the pigeons work out that the owl does not move and perch straight on it. For that money it is better to fix the cause.

A physical barrier works differently. It does not frighten, it removes the place to land, and there is no getting used to that. That is why netting and spikes are the only solution that lasts years without further attention.

Where we install barriers

• Balconies and loggias on apartment blocks and family houses.
• Ledges, sills, parapets and railing edges.
• Light wells, glazed canopies and roof structures.
• Plant floors, machine rooms and roof voids.
• Industrial halls, warehouses and loading bays.
• Photovoltaic panels, under which pigeons like to nest.
• Advertising structures, illuminated signs and facade logos.

Pigeons under photovoltaic panels

The gap between panels and roof is ideal for pigeons: sheltered from above, warm and out of reach of predators. But a nest under a panel means droppings on the roof, blocked drainage and worse heat dissipation from the panels, which cuts their output.

The fix is a perimeter mesh clipped to the panel frame, so no drilling into the panel and no interference with the structure. We clean the space beneath the panels before fitting it.

Rope-access installation without scaffolding

Most places where pigeons nest are high up and awkward to reach. Rope access solves exactly that: we get to a ledge on the eighth floor with no scaffolding, no pavement closure and without having to pass through flats.

For an apartment block that also means a lower price. Scaffolding around the whole building never pays off when a few metres of netting are being fitted, whereas rope access handles the same job in a single working day.

Materials and how long they last

The life of a barrier is set by the material and the quality of the fixings, not by the price of the net itself. UV-resistant netting, properly tensioned, lasts years, while cheap netting without UV stabilisation goes brittle on a south facade within a season or two and starts to tear.

• Netting: UV-stabilised polyethylene, mesh sized to the species.
• Perimeter wire and anchors: stainless, so they do not rust or stain the facade.
• Spikes: stainless wires on a polycarbonate or stainless base.
• Adhesives: only where drilling is not allowed, and always on a degreased surface.

Will installation damage the facade or insulation?

On an insulated facade caution is warranted, because an anchor fixed only into the insulation will not hold a tensioned net and at the same time creates a thermal bridge and a path for water. So we anchor into the load-bearing structure behind the insulation and seal the penetrations.

Where drilling is not permitted, for example on a historic facade or on roof waterproofing, we use bonded or ballasted systems. There is always a way to do it without the barrier leaving damage behind.

DIY installation versus professional installation

Spikes and netting can be bought in a DIY store and on a ground-floor ledge or a sill at arm's height they are a sensible choice. The difference is not in the material but in three things: access at height, surface preparation, and whether the barrier covers the whole area.

The most common DIY mistake is an unfinished area. If even half a metre of gap is left, pigeons find it within a week and the whole investment is wasted. The second mistake is working from a ladder at a height where a ladder has no business being.

Apartment blocks: who approves it and how it is paid for

If the work concerns common parts of the building, that is the facade, ledges, parapet or roof, the owners decide through the manager or the association, and it is usually paid from the repair fund. For the manager we prepare the quote in a form that can be put to a meeting or a written vote.

For work on an individual balcony, most buildings require the manager's consent, because the change is visible on the facade. We recommend checking this in advance, it saves complications afterwards.

What drives the price

The price is set by the length of protected edge or the area of the opening, the height and access method, the type of barrier, and how much cleaning and disinfection is needed beforehand. The condition of the surface is usually the biggest difference between two similarly sized jobs.

• Running metres of ledge or square metres of opening to be closed.
• Height, and whether the work can be done from rope, from a platform or only from scaffolding.
• Type of barrier and fixing material, especially on an insulated facade.
• Extent of soiling by droppings and the need for disinfection.
• Access to the building and whether the area below the work must be secured.

How the survey works and what we need from you

In most cases photos are enough for a first estimate. Photograph the problem area both from a distance and close up, and tell us which floor it is on. If the job is larger or access is complicated, we come for a site survey and measure it up on the spot.

• A photo of the whole building showing the height and access.
• A close-up of the spot where the birds perch or nest.
• The approximate length of ledge or the size of the balcony opening.
• Whether the facade is insulated and whether it is a common part of the building.

Where in Bratislava we work

We work across Bratislava including Petržalka, Ružinov, Nové Mesto, Staré Mesto, Karlova Ves, Dúbravka, Rača, Vrakuňa and Podunajské Biskupice, and by arrangement also in Senec, Pezinok, Malacky and Stupava. Panel blocks in Petržalka and Ružinov make up the largest share of this type of work.