Netting vs Bird Spikes: Cost Effective Bird Control for Solar Arrays

The Question Behind the Question

Netting versus spikes is the wrong comparison for most solar arrays, because the two products solve different problems and neither one is designed for the space under your panels.

People ask it anyway, and it is a fair question, because both show up in search results for solar bird control and both get sold for the job. So here is the useful version: figure out whether your birds are landing on something, entering something, or nesting under something. Each of those has a different answer, and picking the wrong one is how people end up paying twice.

• Landing on a surface such as a ridge, parapet, beam, sign or window head. That is a spike job.
• Entering an open volume such as a patio, alcove, covered entry, rafter bay or loading dock. That is a netting job.
• Nesting in the gap under a solar array. That is a perimeter mesh job.

What Netting Actually Does, and Where It Is the Only Option

Netting is the only product that closes an open volume, which makes it the right and often the sole answer for patios, alcoves, covered entries, open rafter bays, loading docks, warehouse trusses and parking structures.

If birds are flying into a space rather than landing on a surface, nothing else works. You cannot spike air. Netting done properly also has the longest service life of anything discussed here, and it is close to invisible from a distance once it is tensioned correctly.

The tradeoffs are real.

Cost. Netting is the most expensive option per project, and not mainly because of the net. The cost is in the edge cable, the anchors, the tensioning hardware, the layout and the access equipment needed to reach the perimeter. On a two story facade or a high open truss, access is often the biggest line item.

Installation sensitivity. Slack netting sags into a hammock and birds roost in it. Any edge or corner left untied is a door. Netting is the product where a cheap install fails fastest and most visibly.

Not for the panel gap. Draping net over or around a rooftop array is a bad fit. It does not hold a defined edge against panel frames, it traps debris, it makes future panel service awkward, and it looks like what it is.

Cost, Honestly

We do not publish prices for this work, because a number given from the driveway is a guess, and the two things that move the price cannot be seen from the ground.

The first is linear feet of open perimeter. Sixteen panels in two tight rows have far less open edge than sixteen panels strung out in a single run, and barrier products are installed by the foot. The second is how long the birds have been there. A nest from this spring is a bag of material. Three seasons of a colony is a cleanup and sanitizing project that happens before the exclusion project starts.

Relative ordering is stable even when the numbers are not. Spikes are the cheapest per foot. Array mesh sits in the middle. Netting is the most expensive per project because of hardware and access. But cheapest per foot is not cheapest per outcome. Spikes on the wrong problem cost you the spikes, the callback, and another season of droppings on your panels. The cheapest real answer is the one that matches the diagnosis on the first visit.

There is also an output side to the ledger. Panels in a string run in series, so one badly fouled panel limits the current for the whole string. A colony under an array is quietly costing you production the entire time you are deciding.

How to Pick, in One Pass

Walk the property and answer three questions before you take a quote.

Is there nesting material under the panels? If yes, you need perimeter mesh, plus removal and sanitizing. Nothing cheaper will end it, because birds return to the roof they hatched on.

Are birds standing somewhere specific and repeatedly? A ridge, a parapet, a beam over the entry, the top of a sign. That is spikes, sized to the depth of the ledge.

Are birds flying into an open covered space? Patio, breezeway, rafter bay, dock. That is netting, tensioned on an edge cable and closed at every corner.

Most real properties need two of the three, and the roofline gets mapped as one job. Close the array and leave the parapet open and the flock relocates ten feet while you are still paying for the first fix.

The Honest Note

If you have a couple of birds resting on a parapet and no nest under the array, do not buy a meshed array.

A few feet of spike in the right place solves that, and it costs a fraction. We would rather quote the small job you actually need than the large one that sounds more thorough. Ask whoever is bidding to show you the nest before they price the exclusion.