How Roof Damage Lets Rodents Into Your Attic

How a Curled Shingle Turned Into a Mouse Highway

We recently got a call from a customer — let's call her Brittany — in the Slate area who was at her wits’ end with mice in the attic. She’d already had an exterminator out twice. On the second visit, he lay down in the yard, looked up at just the right angle, and spotted something Brittany never would’ve noticed from the ground: a shingle near the roof edge had curled up, leaving a gap big enough for mice to squeeze through.

That tiny opening was all it took to turn her roof into a rodent entry door.

When Brittany called us, she said, “The exterminator thinks they’re getting in through the roof where a shingle curled up. Can you come out and check it and give us a quote to repair it?” We told her what we tell a lot of homeowners in this situation: if rodents have found one weak spot, there may be others. The key is a thorough roof inspection focused specifically on animal entry points — not just leaks.

Why Roof Damage Is So Attractive to Rodents

Most homeowners think of roof damage in terms of water leaks and stains on the ceiling. Rodents look at the same issues and see something very different: easy access to warmth, nesting material, and food smells from the house below.

Here are a few ways roof problems can turn into rodent highways:

• Curled or lifted shingles – Like Brittany’s case, heat, age, or wind can cause asphalt shingles to curl. That curl can expose the underlayment or sheathing and create a small tunnel right into your attic.
• Gaps at the eaves or fascia – Where the roof edge meets the fascia board is a favorite entry spot. If the drip edge is missing, metal flashing has pulled loose, or wood is rotting, mice and squirrels will take advantage.
• Damaged or missing ridge caps – The ridge line (the peak of your roof) is supposed to be sealed. If ridge caps crack, shift, or blow off, rodents can use that opening to enter the attic along the very top of the roof.
• Chewed or loose roof vents – Plastic or thin metal vents can be chewed or pried open by persistent rodents. If the screening is damaged or missing, that vent becomes an entry door.
• Rotten or soft decking – Long-term moisture issues can soften the wood under your shingles. Rodents are surprisingly good at gnawing through compromised wood to make their own opening.

Because mice can squeeze through holes as small as a dime, what looks like a “hairline gap” to you might be a wide-open doorway to them.

How We Inspect a Roof for Rodent Entry Points

When we scheduled Brittany’s inspection, we explained that we’d do more than just go up, glance around, and slap a shingle back down. A proper critter-intrusion inspection follows a methodical process to make sure we’re not missing hidden access points.

1. Ground-Level Exterior Scan

Before we ever set up a ladder, we walk the property and look at the roof from multiple angles — just like Brittany’s exterminator did when he lay down and looked up. From the ground, we can often spot:

• Obvious shingle curling, missing shingles, or lifted tabs
• Wavy or sagging lines that suggest soft decking
• Gaps between the roof and fascia or soffit
• Tree limbs touching or overhanging the roof (natural “bridges” for rodents)

2. On-the-Roof Inspection

Next, we carefully walk the roof, paying extra attention to the areas rodents love most:

• Roof edges and eaves: We check for curled shingles, missing drip edge, exposed nail holes, and small gaps where light could pass through.
• Valleys and transitions: Any place two roof sections meet can hide small cracks or openings if the flashing is loose.
• Vents and penetrations: We inspect all pipe boots, attic vents, and fan vents for broken seals or openings, and check that they’re properly screened.
• Ridge and hips: We look for cracked, shifted, or missing ridge cap shingles, and any signs of chewing or gnaw marks.

We’re not just looking for “big problems.” For rodent control, the tiny details matter — a half-inch gap under a shingle can be more important than a large cosmetic defect.

3. Attic Check (When Possible)

If the homeowner is comfortable with it and access allows, we’ll also take a quick look inside the attic. From inside, we can often see:

• Sunlight shining through nail holes or gaps
• Nesting material, droppings, or trails that lead back toward the entry point
• Insulation damage or staining that points to long-term intrusion

This “inside-out” view helps confirm what we’re seeing on the roof and ensures we’ve found all the paths the rodents might be using.

How We Repair Roof Entry Points to Keep Rodents Out

Once we’ve identified the problem areas, we put together a repair plan. For a situation like Brittany’s, that often includes a mix of shingle repair and sealing work.

Shingle and Decking Repairs

Depending on what we find, we may:

• Replace curled, broken, or missing shingles rather than just nailing them back down
• Install or replace metal drip edge along roof eaves to close small gaps
• Repair or replace any soft or rotten decking before installing new shingles
• Re-seal ridge caps and replace any that are cracked or missing

The goal is not only to stop rodents but also to prevent future water damage, since the same weak spots that let in critters can eventually cause leaks.

Sealing and Screening Vulnerable Areas

Beyond shingles, we also address secondary entry points:

• Re-secure loose flashing and seal any small gaps with appropriate roofing sealants
• Repair or replace vent covers and ensure proper metal screening is in place
• Seal small cracks along fascia and soffit where they meet the roofline

We always recommend coordinating with your pest control company so they can confirm that all access points are sealed and set traps or treatments as needed inside.

Simple Steps Homeowners Can Take Between Inspections

You don’t have to climb on the roof to catch problems early. A few habits can go a long way:

• Walk your property every few months and look up at your roof edges from different angles, especially after big storms or high winds.
• Watch for new noises in the attic — scratching, scurrying, or thumps can be early signs of intrusion.
• Trim back tree branches that touch or hang directly over your roof to remove easy access routes.
• Check your attic periodically with a flashlight for droppings, nests, or daylight coming through where it shouldn’t.

If you see anything that looks suspicious or you’ve already had an exterminator point to a possible roof entry, that’s a good time to call a roofer for a focused critter-intrusion inspection.

Think You Have Rodents Getting In Through the Roof?

Brittany did the right thing by calling us after her exterminator suspected a roof issue. Pest control can remove the mice, but only solid roof repairs will keep them from coming right back.

If you’re dealing with scratching in the attic, droppings, or a pest pro has mentioned a possible roof entry point, we’re happy to come out, walk the roof, and give you a clear, detailed estimate on repairs. Stopping rodents often starts on the rooftop — and a careful inspection is the first step.