Bird spikes, also known as anti-perching spikes or pigeon spikes, are a humane way to deter birds from landing and nesting in unwanted areas. Installing bird spikes is an effective solution for preventing damage and unsanitary conditions caused by bird droppings. When installing bird spikes, one key factor to consider is the height of the spikes. This article will discuss the recommended height for bird spikes to successfully discourage birds while meeting safety standards.
What are bird spikes?
Bird spikes consist of rows of stainless steel or sturdy plastic spikes that are attached to ledges, signs, rooftops, and other surfaces where birds tend to congregate. The spikes act as a physical barrier that makes it difficult for birds to gain stable footing on the surface. Bird spikes come in various lengths, but average 2”-5” tall. The spikes are angled upwards and spaced 2-3 inches apart to prevent birds from being able to land comfortably between the spikes. Though the spikes may seem sharp and dangerous, most bird spike products feature rounded, blunt tips to avoid injuring birds or people. Bird spikes effectively repel all types of nuisance birds such as pigeons, seagulls, starlings, crows, and more.
Recommended bird spike height
For bird spikes to work properly, they need to be tall enough that birds cannot easily perch on the surface above or around the spikes. However, overly long spikes may create safety hazards. The ideal height for bird spikes is 2”-4” tall. Here are some general guidelines for choosing the right spike height:
- 2” spikes are suitable for smaller birds like sparrows and robins
- 3” spikes deter common urban birds including pigeons, starlings, and crows
- 4” spikes help repel larger birds like seagulls, vultures, and blackbirds
Taller 5” spikes are also available but may only be necessary for very large birds like ravens, hawks, and owls. Extending the spikes too far above the surface adds risk of injury to people brushing past. It also provides more surface area for birds to potentially grip with their talons.
Factors impacting ideal bird spike height
There are a few additional factors to consider when selecting the appropriate spike height for a surface:
- Type of birds: Identify the bird species you need to deter and choose a spike height accordingly. For example, small songbirds only require 2” spikes while seagulls may need 4” spikes.
- Surface material: Spikes should extend high enough that birds cannot grip the surface material around or above the spikes. For porous surfaces like stone or wood, longer spikes may be needed.
- Surface width: On narrow ledges or beams, a taller spike height is recommended to fully block birds from landing. Wider surfaces may only need shorter spikes toward the edges.
- Human activity: In high traffic areas, shorter spikes under 4” are safer for people passing by. Areas rarely accessed by people can accommodate taller spikes.
Minimum bird spike height by location
The typical minimum spike heights needed for effective bird control in common areas are:
| Location | Minimum Spike Height |
|---|---|
| Signs and lamps | 2” |
| Beams and braces | 3” |
| Parapet walls and ledges | 3” |
| Roof peaks and turbine vents | 4” |
| Window sills and AC units | 3” |
| Plaza statues and monuments | 2” |
Taller spike heights may be required in certain situations depending on the bird species and other factors unique to each location.
Ideal bird spike coverage
In addition to proper spike height, full coverage with bird spikes is key to preventing birds from finding footing on the surface. Here are some tips for optimal spike coverage:
- On ledges and rails, the spikes should fully cover the entire depth and length of the surface.
- For sign letters and wide surfaces, apply spikes in strategic rows along the edges and problem areas instead of one solid mat.
- Place spikes directly above or below areas already spiked to prevent gaps in coverage.
- Ensure spikes are continuous and seamless around corners and curves.
Using bird netting or mesh to supplement spikes can provide full enclosure and eliminate any remaining gaps for problem bird areas.
Proper bird spike installation
Bird spikes only work when installed correctly. Here are some installation tips to ensure your spikes deter birds:
- Arrange spikes in straight, evenly-spaced rows for consistency.
- Firmly attach spikes using screws, bolts, adhesive, or clips according to the spike product specifications.
- Angle the spikes so they slant slightly towards the direction birds approach from.
- Install spikes high enough that birds cannot access the surface from above or around them.
- Apply enough spike rows to fully cover ledges and eliminate any flat surfaces.
Careful measurement, placement, and attachment ensures spikes stay fixed in their intended position and block birds as desired. Avoid improvising spike placement without a plan.
Maintenance of bird spikes
Like any bird deterrent, spikes will require some periodic maintenance. Schedule inspections to check spikes twice per year, or more often if you notice bird problems returning. Look for any of the following issues:
- Missing, cracked, bent, or damaged spikes. Replace individual damaged spikes as needed.
- Spikes that have become loose or unattached. Re-secure loose spikes.
- Spikes that birds have bent to the side. Straighten spikes back into upright position.
- Buildup of bird droppings, nests, or debris around spikes. Carefully remove all debris.
Proper maintenance ensures spikes maintain their effectiveness and appearance over time.
Other bird control methods
Though bird spikes typically provide the best protection against perching birds, other deterrents can further enhance bird control or substitute when spikes are not appropriate. Secondary options include:
- Bird netting – Stretch plastic or nylon netting over rafters and other covered areas to block birds from nesting or landing.
- Bird wire – Tightly string stainless steel wire in rows to prevent grip and remove landing spots.
- Bird gel – Non-toxic sticky gels make surfaces tacky and uncomfortable for landing birds.
- Bird slope – Steeply angled plastic or metal panels stop birds from gaining footholds on ledges.
- Bird sound deterrents – Devices emitting predator calls, distress cries, or ultrasonic noise frighten off birds.
Using two deterrents together, such as both spikes and netting on a sign, can provide enhanced protection. Rotate methods seasonally for ongoing bird problems.
Professional installation
For large commercial bird spike installation jobs, hiring a professional pest control company is advised. Experts can identify all bird entry points, select the right spike heights and layout, and properly install spikes for maximum results. Professional-grade stainless steel spikes also withstand weather and birds better than consumer-grade plastic spikes over time.
With professional installation, expect to pay approximately $6 to $12 per linear foot for materials and labor. This investment helps ensure long-lasting bird protection and reduces maintenance costs over doing it yourself.
Conclusion
Bird spikes are an affordable, low maintenance way to humanely prevent bird damage and accumulation of hazardous droppings. For effective deterrence, bird spikes should stand 2”-4” tall depending on the type of birds and the specific surface. Full coverage with spikes along ledges and potential perches is key to eliminating a bird’s ability to land. With professional installation and occasional maintenance to fix bent or missing spikes, bird spikes provide long-term bird control.
