Rodents don’t need a large opening to enter a home. A damaged vent screen, a gap around plumbing, or a deteriorating seal along the foundation can provide rats and mice with access to areas where they can nest, travel, and potentially reach the interior of the building.
At Done Right Rodent Proofing, we focus on finding and repairing these vulnerable areas rather than simply treating the symptoms of a rodent infestation. These before-and-after photos show why identifying entry points and using durable exclusion materials is an important part of protecting a home from unwanted rodents.
Before: An Opening Around Pipes Creates a Rodent Entry Point

In the original photos, there is a noticeable opening in the exterior wall where several pipes pass through the stucco. The surrounding material appears damaged, and the existing screen has a large opening near the pipe penetrations.
This type of area deserves attention during a rodent inspection. Pipes and utility lines often pass through exterior walls, foundations, and crawlspace enclosures. When the surrounding materials deteriorate or the protective screening becomes damaged, rodents may find a way through.
Rats are particularly capable of exploiting weak spots around a building. Mice can squeeze through surprisingly small openings, which means even a gap that appears insignificant to a homeowner can become a potential access point.
The problem is not limited to the opening itself. Rodents can move through concealed spaces behind exterior screening and into areas around foundations, crawlspaces, and wall cavities. Once inside, they may leave droppings, contaminate insulation, damage materials, and create ongoing noise or odor problems.
Simply placing traps nearby does not correct the structural weakness that allowed rodents to enter in the first place.
After: Stronger Screening and a Better-Secured Pipe Opening

The after photos show a more secure arrangement around the vulnerable exterior area. The damaged opening has been addressed with metal screening, and the pipe penetration shown in the close-up is fitted with a metal plate around the pipe.
These repairs help close off potential routes that rodents could otherwise exploit.
Metal screening provides a physical barrier across an opening while still allowing the screened area to serve its intended purpose. A properly fitted metal plate around a pipe helps protect the gap where the pipe passes through the surrounding structure.
The important detail is that rodent proofing requires more than covering a hole. The materials must be appropriate for the location, fitted securely, and installed so that rodents cannot easily chew, pull, or push their way through.
Every building is different, so the best repair depends on the size of the opening, the surrounding construction, the utility involved, and the condition of the existing materials.
Why Proper Rodent Exclusion Makes a Difference

Homeowners sometimes discover that their rodent problem returns even after traps have caught several rats or mice. That can happen when the animals are removed but the entry points remain open.
Professional rodent exclusion addresses the underlying problem by combining inspection with physical repairs.
Here are several benefits of correcting vulnerable openings:
- Helps prevent future entry: Closing gaps and reinforcing damaged screening makes it harder for rats and mice to access the building.
- Protects concealed spaces: Blocking exterior access points helps reduce the risk of rodents entering crawlspaces, wall cavities, and other hidden areas.
- Reduces the chance of recurring infestations: When entry points are properly repaired, the building becomes less accessible to new rodents.
- Protects building materials: Exclusion can help reduce the risk of damage associated with nesting, chewing, and rodent activity.
- Addresses the source of the problem: Instead of relying on trapping alone, rodent proofing focuses on correcting the conditions that allow rodents to get inside.
No single repair can guarantee that every possible entry point has been addressed. A thorough inspection is important because rodents may exploit other openings elsewhere along the foundation, roofline, vents, or utility penetrations.
Why Construction-Grade Materials Matter
Not all sealing methods are equally effective against rodents. Soft materials or poorly secured patches may deteriorate, loosen, or be chewed through.
Done Right Rodent Proofing uses materials suited to the repair, including steel screening, solid metal flashing, concrete, and other appropriate construction materials. The goal is to create a durable physical barrier rather than a temporary patch.
The finished work should also be checked for gaps along the edges, loose fasteners, and openings around pipes or other penetrations. Even when a repair looks complete from a distance, small details can determine whether it provides effective protection.
Protect Your Home With Professional Rodent Proofing
These before-and-after photos illustrate an important principle: effective rodent control begins with understanding how rodents are getting into the building.
If you have noticed rats or mice around your foundation, heard scratching in a crawlspace, or found droppings inside your home, it may be time to have the exterior inspected for entry points.
Done Right Rodent Proofing provides rodent exclusion services for homes and businesses throughout Marin County and surrounding areas. Our approach focuses on identifying vulnerable openings, completing appropriate repairs, and addressing remaining rodents through a trapping process when needed.
Call or Text Done Right Rodent Proofing at 415-524-6229 to request a free estimate. We’ll help you identify potential entry points and determine the right approach to protecting your property from rodents.
Done Right Rodent Proofing — Seal It. Trap It. Solve It for Good.