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Rodent Proofing

Rodent Proofing and Exclusion Services for Bay Area Homes

Rodent proofing, also called rodent exclusion, means sealing every structural opening a rodent can use to get inside a house, and then confirming the seal held. Rats need a gap about the size of a half dollar and mice need one about the diameter of a quarter, so the openings that matter are usually too small to notice from the ground. Rywen inspects the attic and crawl space, documents and seals every entry point with galvanized steel mesh and rodent-rated materials, removes contaminated insulation, and returns about one week later to confirm there is no further activity before the warranty is issued.
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What Homeowners Experience

What Homeowners Notice When Rodents Have Found a Way In

Most homeowners do not know there is an entry problem until the signs become hard to ignore, and by then the damage is usually in the insulation. The longer it goes unaddressed, the more nesting material accumulates and the more structural surfaces are affected. Entry points cluster in predictable places, which is why rodent proofing services are priced by the openings rather than by the size of the house: the roofline, fascia and open roof returns, soffit panels, gable and dormer vents, the chimney chase, foundation vents and the crawl space, the garage door perimeter, and every pipe, cable and duct that passes through the exterior wall. These are the situations that usually prompt a call.
  • Scratching, scurrying, or movement sounds at night - often coming from the attic or walls
  • A persistent smell that does not go away even after cleaning
  • Droppings in the attic, crawl space, or inside walls
  • Visible damage to insulation - compressed sections, nesting material, or missing areas
  • Gaps or openings around the roofline, soffits, foundation vents, or utility penetrations
  • An attic or crawl space that has not been inspected in several years
  • Rodents heard or seen in the garage, which is often the route into the wall cavities
  • Screening that is missing or rusted through at gable vents, dormer vents, or the chimney chase
Rywen technician inspecting attic insulation for signs of rodent activity
The Rywen Approach

Structural Exclusion That Addresses Every Entry Point - Not Just the Obvious Ones

Most failed rodent proofing jobs miss entry points or use materials that do not hold up. When homeowners go looking for companies that rodent proof a house properly, the difference is almost never the sealant, it is how much of the structure actually got inspected. Rywen’s approach is systematic: we document every potential entry point in the attic, the crawl space, and the exterior envelope during the inspection, seal each one with materials rated for rodent resistance, and return about one week later to verify the work held before the warranty is issued.
  • Free 40-60 minute attic and crawl space inspection with photo documentation of all active and potential entry points
  • Sealing of gaps in soffits, fascia, roof returns, and roofline using galvanized steel mesh and appropriate sealants
  • Installation of rodent-grade mesh at foundation vents, pipe penetrations, and crawl space access openings
  • Removal of contaminated insulation and sanitization of affected wood surfaces
  • Replacement of damaged insulation after the exclusion work is confirmed complete
  • Follow-up inspection one week after initial work to verify no remaining activity
  • Final confirmation inspection before the 2-3 year exclusion warranty is issued
  • Screening or sheet metal at gable vents, dormer vents, and the chimney chase where the original mesh has failed
  • Sealing of the crawl space access door and the garage door perimeter, including worn sweeps and open corners at the track
What we do not do: Rywen is a structural exclusion and insulation company. We do not offer pest control operations, and we do not use or reference poison, bait stations, or mechanical traps in our work. Our approach is to close the building envelope so animals cannot enter, not to address animals already inside using chemical or mechanical means. For why bait and poison are not a long-term fix, see our guide on rat poison rules in California.
Rywen technician sealing exterior gaps to prevent rodent and wildlife entry
How It Works

How Rywen's Rodent Proofing Process Works

Step 1

Free Inspection

Axel inspects the attic and crawl space, photographs all entry points and signs of activity, and documents insulation conditions. Written report included.
Step 2

Written Estimate

You receive same-day pricing covering exclusion work, insulation removal if needed, and the follow-up process. Nothing starts without your written approval.
Step 3

Exclusion Work

Our crew seals every documented entry point using galvanized mesh, sheet metal, and expanding foam rated for rodent resistance. All materials are checked for durability before the crew leaves.
Step 4

Sanitation and Insulation

Heavily contaminated spaces get full attic decontamination and cleanup first. Contaminated insulation is removed, affected wood surfaces are treated, and new insulation is installed after the exclusion work is confirmed complete.
Step 5

Follow-Up Inspection

Tony returns approximately one week after the initial work. If any activity is still detected, our team returns at no charge to address remaining issues.
Step 6

Final Confirmation and Warranty

After monitoring confirms the exclusion is holding, Rywen issues the 2-3 year structural exclusion warranty along with an inspection record and care guide.
Rywen Insulation crew team standing in front of company vehicles
Common Questions

Rodent Proofing - What Homeowners Ask

Why do I keep getting rodents even after having work done by another company?
The most common reason is incomplete entry point sealing. A gap the diameter of a quarter is enough for a mouse. Gaps the size of a half dollar allow rats. Companies that do not spend adequate time on the inspection miss these openings, and the problem returns. Rywen documents and seals every identified point, then verifies the work held at the one-week follow-up before issuing any warranty.
Rywen is a structural exclusion company. We seal entry points, remove contaminated insulation, and sanitize affected areas. We do not perform pest control operations. If there are animals still active inside the structure, this is typically addressed before sealing, and we communicate clearly about what we observe during the inspection.
Most projects are completed in one day. In cases where rodent activity was significant, we sometimes recommend completing the removal and sanitization first, then returning after a one-week monitoring period to install new insulation and seal remaining points once we have confirmed the situation is resolved.
Rywen typically provides a 2-3 year structural exclusion warranty covering the entry points that were sealed and serviced. The exact duration is outlined in the written proposal. The warranty is issued only after the follow-up inspection confirms the work is holding.
If the existing insulation needs to be removed due to contamination, replacement insulation is quoted separately and is typically installed as part of the same project after the exclusion work is confirmed complete.
There is no useful flat price, because the work scales with the number and type of openings rather than with the square footage of the house. The variables that move a quote are how many entry points there are, whether they sit at the roofline or the crawl space or both, how much of the existing insulation is contaminated and has to come out, and how accessible the attic and crawl space are. Axel measures all of that during the inspection and gives you a written figure the same day at no cost, so you are comparing a real number rather than a guess made over the phone.
Yes, and on a lot of Bay Area homes the crawl space is the more important half of the job. Crawl space rodent proofing covers screening the foundation vents with rodent-grade mesh, sealing around the access door, and closing the gaps where plumbing, gas, and electrical lines pass through the wall or floor. Sealing the attic and leaving the crawl space open tends to move the problem rather than end it, so the inspection always covers both.
No, and the difference matters. Some insulation products are marketed as rodent resistant, and a few do hold up better to chewing and nesting than standard fiberglass, but insulation is not a barrier. Rodents get in through structural openings, so a rodent-resistant product installed over entry points that were never sealed simply gets fouled more slowly. The sealing has to happen first. New insulation after that is a real improvement, and it lasts because nothing is getting to it.
That is how Rywen is set up, and it is the reason the sequence stays in the right order. Contaminated insulation removal and attic decontamination come first, the exclusion work second, and new insulation last, once the entry points are confirmed closed. When those three jobs are split between separate vendors, the insulation often goes in before the sealing is finished and has to be paid for twice. Keeping all three in-house also means one warranty and one point of contact.
Rywen has been doing exclusion and insulation work in the East Bay since 2020, under CSLB license #1140414 as a C-2 Insulation Contractor. Every crew member is an employee rather than a subcontractor, which is the main reason the same standard shows up on every job. Axel inspects and delivers a written estimate the same day at no cost, the crew photographs the work as it goes so what was sealed and where is documented rather than described, and Tony returns about a week later to check that the exclusion held. As of August 2026 the company holds a 5.0 rating across 197 Google reviews. It is a family business: the name comes from Roni’s two sons, Ryan and Owen, and his brothers run estimating, field crews, and quality control.