Tag Archives: HVAC units

Brett Madden, Aviaway
Bug Bytes

Strategies and Building Design Improvements to Help Prevent Birds

By R. Brett Madden
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Brett Madden, Aviaway

Bird droppings and nesting materials, if allowed to accumulate over time, can cause severe damage to building facades, ledges, loading docks, walkways, roofs and more. Building materials such as stone, wood and metal can be damaged due to the acidity of the bird droppings. And in extreme cases, a buildup of bird droppings can impact the structural integrity of a structure. Also, roof drains can become clogged, and fire hazards from packed nesting materials around electrical fixtures can develop. Not to mention all the possible diseases that can result from disturbing bird droppings! Rather than waiting until these bird problems develop and result in potentially expensive remediation, in most cases, it will be cheaper to consider bird prevention design elements beforehand—specifically, in the design-build stage (ideally) or the retrofit stage (alternatively).

Before we can review the building design elements, it is best to review the types of areas that birds prefer to land, roost and nest. This way, when considering a design element, considering the kinds of spaces they prefer to set up camp will make more sense.

  • 90-Degree Ledges
    • Building ledges
    • Decorative elements
    • Truck bay bumpers
  • Knee Walls (parapet ledges)
    • Typical construction around most commercial buildings
    • Roof structure types
    • Flat based surface areas
  • Covered Overhangs
    • Loading docks
    • Building canopies
    • Interior building structures
  • Roofing Equipment
    • Under HVAC units
    • Ductwork
    • Roof equipment
  • Water Sources
    • Retention ponds
    • Decorative fountains
    • Any water source (natural or otherwise)
  • Food Sources
    • Fruit trees
    • Trash removal
    • Container practices
    • Proximity to building
  • Light Fixtures and Electrical Items
    • These items provide warmth
    • These items provide elevated areas to survey area and avoid predators

In the design-build phase of the project, when we work with architects, we always recommend decreasing the number of 90-degree ledges or reducing the ledge depth surface area as much as possible. In those areas that we are not able to reduce or eliminate the ledge, we would recommend a landing-based deterrent product such as a bird spike, bird wire, ledge exclusion system or electrified shock-based bird control product. Each of these types of bird deterrent items has different pros and cons.

Bird spikes, Aviaway
Bird spikes (All images courtesy of Aviaway Bird Control Services & Consulting)

Bird Spikes

Bird spikes are a type of bird deterrent/and anti-roosting device that will make it hard for a bird to land on a leading ledge and close its wings as it walks onto the ledge surface. When a bird’s landing process is made more difficult, combined with a reduction of the surface landing area, the birds will be deterred from the leading ledge area. Most types of bird spikes have thin metal/plastic rods that are attached to a solid base that point in an upward direction. Bird spikes come in various widths depending upon the surface ledge width area. Bird spikes can be mounted to just about any ledge/surface. Bird spikes can be installed on numerous types of building ledge types and sizes. Bird spikes can be an effective deterrent on gutters, signs, rooflines, cameras, pipes, parapet/knee walls, and related building surfaces.

A con of using bird spikes is that bird spikes are primarily designed to deter larger birds like pigeons. Smaller birds such as sparrows or starlings will not be deterred with bird spikes. A smaller bird can move within and around the rods to use the rods to hold nesting materials within the strands of rods to hold their nesting materials within the bird spike to create a nest. Another con is that larger quantities of bird spikes are unappealing to the building aesthetics.

Bird wire

A bird wire system is a combination of stainless-steel posts that are either epoxied or tapped and drilled into the surface area (typically mortar lines/joints). After the stainless-steel post is mounted, a thin monofilament stainless steel wire is secured between the posts with a micro-spring. The wire is tensioned between the two posts. As pigeons or larger birds attempt to land on treated areas, they will not be able to close their wings and thus will be deterred from landing on treated areas.

A con of using bird wire is that it is typically only effective against larger birds.

Ledge exclusion
Ledge exclusion

Ledge Exclusion

The goal is to turn a 90-degree angle into a 45-degree angle. When you have a ledge that has a base landing area and a return wall area, this allows birds a great shelter area and an ability to survey surroundings. By creating a 45-degree angle, you take a bird’s ability to land and get a foothold and land on the surface. The product is effective for larger birds such as pigeons and smaller birds, too.

The only real con of the changing the ledge structure is matching the building finish. However, this is the best bird exclusion method that is effective against all bird species.

Shock Track

Shock track is a low-profile shock track system with a minimalist low profile, and virtually invisible solution to deter and prevent birds from landing, roosting or nesting on building ledge-based surfaces. The shock track system will deliver a mild/startling electric shock when the bird contacts the strip. Shock track systems are a great option when building/structural aesthetics are a key factor for the facility.

For larger areas such as loading docks, canopies, and related covered structures, netting is the main bird exclusion method.

A few cons for a shock system are that at times, you may have some arcing with heavy snow or water collection when connection area of the strips make contact, and this system is typically only effective against larger birds.

Bird netting
Bird netting

Bird Netting

Bird netting is an exclusion method of bird control. It is intended to be installed on buildings, loading docks, warehouses, airport hangers, transportation facilities, barns, food silos, over building exteriors, balconies, parking garages, rooftops, HVAC units, bridges, agricultural crop applications, ponds, and any other surface that netting hardware can be installed. Bird netting is the best method for excluding all pest bird types. Specifically, seagulls, pigeons, sparrows, starlings, and crows can all be excluded from bird netting.

Bird exclusion netting will prevent birds from gaining entry above any areas that are netted off. It excludes pest birds from roosting and nesting. There are various types of netting and mesh sizes. When selecting the type of netting and mesh size, it is critical to both the target pest bird and where the netting is being installed.

By far, bird netting the best bird exclusion method to control all bird species. The only con of bird netting is that depending upon the application, and the cost can be expensive.

In conclusion, when considering the design-build phase or a retrofit project, the aforesaid areas that are attractive to birds to land, roost and nest should be considered. In most cases, birds can be prevented with a bit of planning.

Remember to also consider surrounding areas (proximity of birds), acceptable pest bird threshold levels, reducing all food and water sources, and closing off all possible entry points. The goal is to not only prevent the birds from setting up shop on the building, but we want to try to keep them an acceptable distance away, too.

Brett Madden, Aviaway
Bug Bytes

Bird Problems and Control Methods for Food Production Facilities

By R. Brett Madden
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Brett Madden, Aviaway

Various types of pest birds can impact food plant structures and facility surroundings. Even a single bird that finds its way into a food plant can trigger a host of concerns such as, failed audits, product contamination, plant closure, production stoppage, lost revenues, fines, structural damage, health hazards to occupants and fire hazards.

In most cases, a food plant operation has a bulletproof pest control plan; however, in most cases, birds are always an afterthought in most pest management plans. After inspecting and consulting numerous food plants, I hear the same story over and over: “I have a person in the warehouse that can chase them out” or, “are birds really a big deal?” or, “why do I have to be concerned about birds?” and on and on. Despite what you may think, birds are a big deal, and you should take them seriously!

Pest management, pigeon droppings HVAC
Larger birds, such as pigeons, can cause more problems around the exterior of a facility on HVAC units as seen here. (Image courtesy of Aviaway Bird Control Services & Consulting)

Since food processing plants contain areas that have very sensitive environments, birds can introduce various adulterants and harmful contaminants. Birds can cause potential harm to humans due to foodborne illness.

Pest Bird Species

There are four main pest birds: Pigeon, Starling, Sparrow and Seagull. Each one of these birds can cause a host of concerns and issues for food processing facilities. Just one bird can cause catastrophic damage. In most cases, small pest birds such as Sparrows and Starlings can gain access into a facility through a variety of ways:

  • Damaged bumpers around truck bay loading dock doors.
  • Open doors (seems obvious, but I always find doors wide open during audits).
  • General building deficiencies.

Larger birds, such as Pigeons and Seagulls, typically cause more problems around the exterior of a facility on ledges, rooftops, HVAC units, loading docks and related areas.

In either case, these various types of pest birds can cause significant problems on the interior and exterior of food plants.

Conducive Conditions

In most cases, facilities want to reduce as many conducive conditions as they can around and within the facility in a timely fashion. A conducive condition is one whereby due to a building condition, structural design, equipment operation, food or water source, or surrounding conditions (i.e., near a public landfill, raw materials mill or body of water) can attract pest birds to a facility. With each of these conditions, great care must be taken to reduce as many conducive conditions as possible.

Examples of Conducive Conditions

Structural Conditions

  • Loading docks/canopies with open beams and rafters
  • HVAC equipment
  • Pooling water (roof and landscaping)
  • Structural overhangs and ledges
  • Open access points
  • Landscaping (types of plantings)
  • Damaged truck bay bumpers
  • Gaps and opening around the structure
  • Doors with improper sealing

Human Conditions

  • Open dumpsters
  • Overflowing dumpsters
  • Dirty dumpsters
  • Product spillage
  • Employees feeding birds
  • Doors left open

All these conducive conditions, if left unresolved, can lead to significant bird problems. Reducing as many conducive conditions as possible will be the first step of any bird management program.

Bird Control Methods

From the start, your facility should have a bird management plan of action. For the most part, bird problems should not be left to be handled internally, unless your staff has been properly trained and has a bird management plan in place.
Most birds are protected by the Federal Migratory Bird Treaty Act of 1918. However, Pigeons, Sparrows, and Starlings are considered non-migratory birds and are not protected under this Act. Even though these three bird species are not protected, control methods still need to be humane. More specifically, your bird control program must also comply with is the American Veterinary Medical Association (“AVMA”) Guidelines for the Euthanasia of Animals if this is the control method selected. The AVMA considers the House Sparrows, Feral Pigeon, and the Common Starling “Free-Ranging Wildlife.” And Free-Ranging Wildlife may only be humanely euthanized by specifically proscribed methodology.

In addition to the above-mentioned regulations, various regulations regarding the relocation of birds/nests may also apply. I also always recommend checking with local and state agencies to ensure that there are no local regulations that may apply. Bottom line: Don’t rely on untrained internal practices; one misstep could result in heavy financial fines and penalties.

Bird Management Strategies

First Line Defense

  • Stop any bird feeding around the facility immediately
    • Any bird management plan should have a clear policy prohibiting employees from feeding birds. Once birds have been accustomed to routine feeding, the birds will continue to return.
  • Eliminate Standing Water Sources
    • All standing or pooled water needs to be eliminated. Thus, routine roof inspections need to be conducted to ensure drains are working properly.
    • Landscape irrigation needs to be calibrated to ensure no puddling of water in areas of low sun exposure.
  • Proper Sanitation Practices
    • Ensure that dumpster lids are closed when not in use.
    • Trash removal frequency adequate.
    • Routine cleaning of trash receptacles.
    • Immediate removal of spilled food.
  • Eliminate Entry Points
  • Survey the facility to ensure that all holes are properly sealed.
    • Around truck bay bumpers and doors
  • Exhaust vents are properly screened.
  • Windows are closed and have screens when in use.

The most appropriate bird control strategy will be determined based on the severity of the bird pressure. For example, if the bird pressure is high (birds have nested), then in most cases, you will only be able to use bird exclusion methods. Whereas, if the bird pressure is light to moderate (birds have not nested), bird deterrent methods can be used. This is an important distinction. Bird exclusion is physically changing the area to permanently exclude said pest birds. Whereas, bird deterrent devices inhibit birds from landing on treated areas.

Bird Deterrent Methods

After the previously mentioned first-line strategies have been implemented, the next step would be to install bird deterrent products (birds have not nested).

  • Bird Spikes
  • Bird Wire
  • Electrified Shock Track
  • Bird Gel
  • Sonic & Ultra Sonic Devices
  • Lasers and Optical Deterrents
  • Hazing & Misting Devices
  • Pyrotechnics
  • Live Capture

Bird Exclusion Methods

If the birds have nested in or around the facility, the next step would be to install bird exclusion products (birds have nested).

  • Bird Netting
  • Ledge Exclusion (AviAngle)
  • Architectural modifying structural
  • Aggressive Harvesting (Targeting)

Prevention Strategies

The best prevention strategy is planning and knowledge. Conduct a bird audit and develop a bird management plan before birds get near or inside the facility. The key is to act quickly, as soon as an incident occurs. I find countless times when I am called in to consult or service a food plant, that the birds got into the facility and no one knew what to do, and as a result, the birds remained within the facility for an extended period, thus increasing the risk of exposure. It is always much easier to remove a bird when they are unfamiliar with their surroundings. Whereas, it is much more difficult to remove birds from a facility that has had a long-standing bird problem.

Once you have a plan, who oversees the bird management plan? Are thresholds determined and set for various areas of the facility? For example, a zero threshold in production areas? Threshold levels will be set based upon by location and sensitivity of the said location. What steps are going to be taken to remove the bird? For how long is each step conducted? These questions need to be answered and developed to stay ahead of bird problems.

Reduce as many conducive conditions as possible. The longer a conducive condition stays active, the more likely birds, as well as other wildlife or rodents, will be attracted to the site and find a way into the facility.

Pathogen Contamination & Hazards

Birds present a host of problems, whether they are inside or outside of a facility. Birds can roost by air vents, and the accumulation of bird feces can enter the facility air system. Bird droppings on walkways and related areas allow for the possibility of vectoring of said dropping when employees step on droppings. Thus, spreading fecal matter/spores and other contaminants to areas throughout the facility.

If birds are within the facility, droppings can spread on product lines, raw materials, stored products, equipment and more, thus, causing contamination. Because of a bird’s ability to fly, they are perfect creatures to spread various diseases, pathogens, ectoparasites and fungal materials. Diseases such as Histoplasmosis, Salmonella, Encephalitis, E-coli, Listeria, and more. Birds have been known to transmit more than 60 infectious diseases!

Besides the spread of potentially harmful contaminants throughout the facility, bird droppings and nesting materials can also create a host of additional problems:

  • The acidity in bird droppings can damage building finishes, façade signs, lighting and more.
  • Wet bird droppings can create a slip and fall hazard.
  • Bird nesting materials can create a fire hazard around façade signs, exit signs and light fixtures.
  • Bird nesting and debris can clog roof drains and cause roof leaks from standing water.
  • Introduction of ectoparasites into the facility such as bird mites, lice, fleas, ticks and more.

Conclusion

In summary, taking a proactive approach to bird control is the best practice. Reduce food, water and shelter sources (aka conducive conditions) promptly. Pest management programs need to implement a more in-depth section of the program for bird control. Like integrated pest management, bird control should be based upon an integrated method. Each facility will have its unique challenges. As such, each bird management plan needs to be tailored to the specific site. A well designed and balanced, integrated bird management program will provide long-term and cost-efficient bird control.

The next article in this series takes a closer look at how to prepare an integrated bird management audit program.