Rodent Proofing for Milwaukee Homes

Why is proofing a method and not a species list?

Proofing is a method because the openings and the routes are the same whatever animal uses them. The Milwaukee sources do not describe the local rodent species, so this guide keeps to the method and does not name a species or a season.

A rodent gets into a house through an opening, and the opening is the thing a homeowner can change. A list of species tells the reader what might be present, but the method is what closes the route. A homeowner who works through the method will close the openings a rodent uses, whatever the species turns out to be.

The guide does not claim a local pattern, because the sources this site relies on do not describe one for Milwaukee. A homeowner who sees droppings or gnaw marks should have the sightings checked by a technician who can identify the animal on the day, and the report should record that identification.

• The opening is the thing the homeowner can change
• The method works whatever the species
• Identification is made on the day, by a technician

How do you survey the openings from the grade up?

Survey the outside from the grade up: the foundation, the openings at pipes and cables, the vents and soffit, and the doors and windows. Mark each opening with a size note, because the material depends on the size.

Start at the grade. Look for an opening at the base of the foundation, where a crack or a gap meets the soil, and for any place where a pipe, cable or hose enters the wall. These are common entry points because they are low and often have a ring of open material around them.

Move up to the vents, the soffit and the eaves, where a screen may be torn or a board may have pulled away. Check the doors and the windows, including the threshold and the frame. Mark each opening with its position and its size, and the material choice follows from the size.

• Foundation base and the grade
• Pipe, cable and hose entries
• Vents, soffit and eaves
• Doors, windows, thresholds and frames

Which materials close an opening, and which do not?

Metal mesh, packed steel wool sealed over with a suitable material, and a rigid cover are the materials that resist chewing and moving. Foam alone and a loose filler are not reliable, because a rodent can chew through or push them aside.

A metal mesh is the usual choice for a vent or a small opening that must let air pass. It is cut and fixed so there is no edge a rodent can pull back. A mesh that is torn or bent is replaced, because a damaged mesh is an open route.

Packed steel wool is used in an irregular gap and then sealed over with a material suited to the surface. A rigid cover, such as a metal plate fixed over a larger hole, is used where the opening is too big for mesh. Foam is not used on its own. A rodent can chew it, and the result looks sealed until the foam is gone.

How do you remove the food and shelter that draw rodents?

Remove the food and shelter that draw rodents to the building: stored food in sealed containers, pet food and bird seed in closed bins off the floor, fallen fruit and debris cleared from the foundation, and stored items kept off the floor and away from the wall.

Food is the main draw inside and outside a house. Dry goods in a paper bag or a cardboard box are easy for a rodent to reach, and a sealed container with a tight lid is not. Pet food and bird seed belong in a closed bin, and the bin should be kept off the floor and away from the wall. Spilled food should be cleaned up the same day.

Shelter is the second draw. Stored boxes, firewood stacked against the wall, and debris at the foot of the foundation give a rodent a place to hide close to the house. Keep those at a distance from the wall, raise them off the ground and clear the debris regularly.

• Sealed containers for dry goods
• Closed bins for pet food and bird seed
• Stored items off the floor and away from walls
• Clear debris and fallen fruit near the foundation

What does a homeowner check inside the house?

Inside, check the kitchen and pantry, the basement, the crawl space and the attic for droppings, gnaw marks and worn routes. A route that runs along a wall to a pipe shows the entry better than a single dropping does.

A flashlight is the main tool. Look along the base of cabinets, behind appliances, along pipes in the basement and in the attic over the insulation. Droppings, gnaw marks and dark rub marks along a wall are the signs. Note where they are and the date, so the next check can be compared.

A worn route is the most useful sign. If the marks run in a line from a wall to a food source or a hiding place, the entry is usually close to the start of the line. The homeowner should note the line and report it, rather than sealing the inside walls, which hides the route rather than closing it.

• Flashlight along cabinet bases, pipes and insulation
• Droppings, gnaw marks and dark rub marks
• Note the route and the date
• Report the route; do not seal the inside wall to hide it

When is a trap or a bait used, and what should be kept in mind?

A trap or a bait is a separate decision made after the survey, not a substitute for it. Traps and baits must be placed where children and pets cannot reach them, and they are checked on a set schedule.

A trap or a monitor can confirm that a rodent is present and can show the route it uses. It does not close the opening, and a homeowner who relies on traps without sealing will catch some animals while the route stays open. The technician decides whether a trap or a bait is useful after the survey.

Bait stations and traps should be out of reach of children and pets, and they should be checked and emptied on a set schedule. A dead animal should be handled with gloves and a bag, and the trap should be cleaned after use. The homeowner should keep a note of the placement so the trap is not forgotten.

• Traps follow the survey, not replace it
• Out of reach of children and pets
• Checked on a set schedule
• Handled with gloves and a bag

How do you recheck the work and keep the house closed?

Recheck the seals after the first winter, keep the record of the sealed openings, and watch for new activity at a point that was marked. A house stays closed through a record and a recheck, not through one visit.

A seal that held in the autumn can fail in the winter, when freezing and thawing move the material. The recheck looks at each marked point and resets any that have opened. The record of the first season is the list, and the recheck does not start from the beginning.

A rodent can come back through an opening in a neighbouring building or a new gap in the house. The homeowner should report any new activity with its position and date, and a new finding is added to the list. The guide does not promise that a house will never see a rodent again. It describes the method that makes the house harder to enter.

• Recheck after the first winter
• Reset any point that has opened
• Report new activity with position and date
• Add new findings to the list

How does winter change the outside shell?

Freezing and thawing can open caulk joints, lift mesh and loosen covers. The winter check looks at each marked point and resets any that have moved, so the shell is closed again before the next season.

Cold weather is hard on sealing materials. Caulk contracts, mesh can pull away at its fixings, and a cover can loosen when the surface beneath it moves. A homeowner who checks the marked points after the cold spell will find the failures early, while they are still small.

The check is made from inside as well as outside. A point that was tight in the autumn may let light through in the spring, and the light test shows the failure before it becomes a route. The record of the autumn tells the homeowner which points to look at first.

• Check the marked points after the cold spell
• Light test from inside for each point
• Use the autumn record to start the check