How To Stop Rats Climbing Walls
Video How to prevent mice from climbing the wall
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Contents
Rodent-resistant construction: Drainage and feeding equipmentUsing common construction techniques involving drainage and feeding equipment can effectively prevent or reduce damage caused by rats and mice. Stephen M. Vantassel, Wildlife Damage Extension Project Coordinator Scott E. Hygnstrom, Extension Specialist, Wildlife Damage Specialist Dennis M. Ferraro, Extension Educator Read: how prevent mice from climbing the wall
- Physical Abilities of Rats and Rats
- Drains and pipes
- Mechanical protection
- Bins and crates of animal feed
- Feeds and opt-out of archives
- Recognition
Comprehensive rodent protection should include protective devices on pipes, cables and conduits, drains and other equipment where rodents travel. In addition to preventing access to structures along these routes, attention should be paid to reducing food, water and shelter sources for rats and mice. This NebGuide focuses on excluding the Norwegian rat (Rattus norvegicus) and the house mouse (Mus musculus), but this information is applicable to many rodents and birds. Other methods for creating rodent-resistant structures are described in NebGuide G1530, Anti-Rodent Structures: Structural, topqa.info/sendIt/g1530.pdf.
Physical Abilities of Rats and Rats
To help determine how rodents can get into structures, you must understand their capabilities. For example, rats and mice can:
- run along and climb wires, ropes, cables, vines, shrubs and trees to enter buildings;
- climb almost any rough vertical surface such as wood, brick, concrete, and weathered sheet metal;
- crawling along pipes, drills, conveyors and conduits; and
- gnaws a variety of materials, including aluminum sheet, wood, rubber, vinyl, plastic and concrete blocks.
In addition, mice can:
- climb the outside of vertical pipes and conduit up to 3 inches in diameter, climb the outside of larger pipes attached to buildings by bracing themselves to walls and climb inside of buildings vertical pipe from 1½ to 4 inches;
- scale any horizontal or vertical wire;
- go on any horizontal pipeline;
- jump 36 inches vertically and 48 inches horizontally;
- fell 50 feet without serious injury;
- dig straight into the ground to a depth of 48 inches;
- enter holes slightly larger than ½ inch in diameter;
- up to 13 inches along vertical walls; and
- swim half a mile in open water, dive through water traps in plumbing, and walk in sewers against significant currents.
Figure 1. Cover the discharge pipe to prevent rodents from entering the open pipe.House mice can:
- jump 18 inches vertically, and jump over vertical surfaces to reach even higher;
- drop 8 feet and run away unharmed;
- enter holes slightly larger than ¼-inch in diameter;
- travel up to 1½ miles; and
- hang upside down and travel a distance on ¼ inch wire mesh or 12-gauge wire.
Drains and pipes
Both rats and mice use sewer pipes or sewage systems as conduits into buildings. Fitted with a metal mesh floor drain that is fastened into place. Use mesh openings that are ¼ inch across and made from 19 gauge cord. Although uncommon, rats can enter buildings through toilet plumbing. Unfortunately, the product that prevents rats from entering through the toilet, called a rat protector, is no longer available. People experiencing this problem should consult with their local sanitation or health department about starting a sewer rat control program. Figure 2. Food stalls, corncobs, and other existing wooden structures can be vermin-proof by installing stiff cloth overlaid with a sheet of sheet metal. The stiff fabric can also act as a wall to prevent rodents from burrowing.Those with on-site wastewater treatment systems such as septic tanks/sewer systems or residential lagoons should contact an onsite industry-certified professional. If an on-site wastewater treatment system is used, secure the discharge hose to an underwater residential lagoon, near the center of the lagoon, as required to prevent entry of rodents. Avoid holes in the cover of the septic system cleaning pipes or gutters to eliminate potential entry points. Extend the discharge pipes far enough across the shore or into the lagoon to prevent rodents from jumping or crawling into the open end. Install rodent screens (Figure 1) or use elbows facing down to prevent rodent access. Read more: how to turn on a gas oven without electricity A metal “floating” cap on the open end of the exhaust, which hinges on its top edge, can also work. The hinge must work easily so that water or feces will open the lid, but the lid must fall back into the closed position when flow stops. These caps sometimes freeze, or solids can push them open, so check them often. Left open, they allow easy entry for rodents.
Mechanical protection
Install guards of sheet metal or similar material to prevent rodents from climbing or moving along a particular route. Barriers should be wide enough and properly located to prevent rodents from climbing over or jumping around them. Attach metal panels to the wall to prevent rodents from climbing. Rodent protection panels must be 12 to 18 inches wide and 36 inches above the floor or the ground. They can be installed to prevent rodents from climbing outside of buildings with rough exterior walls. Use rodent protectors in combination with stiff cloth, or other suitable materials, for kennels, rat-proof cornices, and other structures (Figure 2). Install guards to prevent rodents from moving along horizontal or vertical pipes (Figure 3a), electrical wires (Figures 3b, c), conduit and cables adjacent to a structure. Figure 3a. Fit a 12-inch square of flashing aluminum or galvanized metal around the duct to prevent rats from climbing up. Caulk distance around pipe if opening is more than ¼ inch. Figure 3b. Flat mouse guards for small pipes and wires are made of galvanized steel sheet gauge 26 or heavier. Minimum width – 24 inches. 18 inches from the wire to the top of the guard, 12 inches from the wire to the bottom of the guard. Figure 3c. Triangle guard made of flashing aluminum or galvanized metal to prevent rats from climbing. The triangle should be 12 inches wide at the base and 12 inches high. Figures 3b, c provided by the National Park Service. Figure 5a. Round guard is made of 26 gauge or heavier galvanized metal or aluminum. The disc must be at least 18 inches in diameter. Courtesy of the National Park Service. Figure 5b. The disc baffle and the sleeve help prevent rodents from traveling on the power lines of the utility line. Figure 4. Protective measures to prevent rats from climbing on drills, pipes or wires leading to buildings. Free-hanging rails are susceptible to damage. Construct 24-gauge sheet metal circular guards and anchor them in place with one or more arms on the opposite side of where rats can reach. Circle defenders must extend 18 inches around the lines they protect. The circular cone-shaped shields prevent rats from climbing up vertical pipes, water pipes and trees. The foundation or foundation for the grain bin should extend into the ground to prevent rats from burrowing. Figure 6. Aluminum tree collars can help prevent rodents from climbing. Figure 7. Rats cannot live under or around food pits without shelter. Figure 8. Using metal containers with tight-fitting lids for household waste. The holder prevents them from being tipped over by roaming dogs or other animals. Store pets and pet food in rat-proof containers and dispose of waste immediately to prevent rodent use.Clearance between wire or hose and guard. Mount the cone or disc on slings, ropes, drill bits or pipes (Figure 4). Use inch wire mesh screens or guards to keep rodents out of the inside of feeders, fan housings, and similar openings. With a little ingenuity, you can design rodent guards to suit any situation. Prevent rats from walking on cables by purchasing available disc baffles and sleeves to prevent squirrels from using power lines (Figures 5a, b). Consult your utility company before installing any of these products yourself. Under no circumstances should access to power lines. Ask the utility company to install them. Power companies have successfully used a product called CritterGuard® to prevent rodents from running on their lines. Read more: How to put on a wig cap To protect the horizontal lines from carrying electricity, cut a plastic tube 2 inches in diameter lengthwise, spread it out, and put it over the cable. Sleeves should fit snugly so that they rotate when the mouse tries to walk past them. Sleeves should be at least 18 to 24 inches long. Collars can be creatively painted so that they blend in with the background. Use metal collars to surround trees and power poles to prevent rodent movement (Figure 6). Collars should be at least 2 feet wide and set 6 to 8 feet above the ground. The collar edges overlap and connect by spring to allow the tree to grow or be enlarged on a biennial basis.
Bins and crates of animal feed
Rats often burrow and nest under food pits placed directly on the ground, on concrete blocks, or near the ground. Install properly designed concrete tunnels that rest firmly on concrete aprons to eliminate rodent habitat (Figure 7). While livestock traffic may discourage rats from burrowing under their aprons, you may need to build a foundation to prevent burrowing around the edges of the apron inaccessible to pets. The concrete foundation for the food bins should extend 36 inches below the layer on the outside edges to prevent rats from burrowing under the floor slabs (Figure 6). Install 1 ½ inch of 1-inch-diameter gravel and maintain a clean, weed-free area around the perimeter of the rock slab to prevent rats from burrowing and to allow for easier detection of mouse activity. A less expensive but effective alternative involves pouring packed gravel 2 inches thick on top of a ½ inch layer of galvanized hard cloth. The stiff fabric will prevent burrowing even if the rat decides to dig through the packed gravel.
Feeds and opt-out of archives
Proper storage and disposal of household waste, grain or feed waste, and dead animals are very important parts of rat control. Good hygiene will limit food, water and rodent habitats. Whenever possible, store livestock or pet food in secure containers with tight-fitting lids or rodent-proof containers or the like (Figure 8). Sweep up areas where grain and food spills may accumulate, such as around gutters, bins, and feeders. Bury the carcass at least 24 inches below ground to discourage scavenging. For more information on rodent control see NebGuide G1737, Mouse Control, topqa.infopubsÂ.unl.edu/sendIt/topqa.info and NebGuide G1105, House Mouse Control, topqa.info/sendIt/g1105 .pdf.
Recognition
Dallas R. Virchow, Wildlife Damage-Expansion Assistant, contributed to this previous version of NebGuide. We would like to thank the US National Park Service for contributing to this publication.This publication has been peer-reviewed. Disclaimer References to trade products or trade names are made with the understanding that it is not intended to discriminate against those not mentioned and without the endorsement of the University of Nebraska-Lincoln Extension for those mentioned. Visit the University of Nebraska-Lincoln Extension Publications Web site for additional publications. Index: Wildlife Management Wildlife Damage Control Released May 2010
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