Rodent Exclusion and Entry Sealing in Utica, NY

How big does a gap have to be before a rodent can use it?

Smaller than most people expect. A mouse can pass through a gap about the width of a pencil, and rats can use a gap about the size of a quarter or a little larger.

Mice are good climbers and can squeeze through openings that look too small to matter. Rats are heavier but can still use gaps the size of a coin, and they chew to make a gap larger. Any gap that looks small enough to block a finger should be treated as a possible entry point.

The survey therefore checks every joint and penetration, not just the obvious holes. Gaps around pipes, cable entries and vent covers are common, and so are the joints where the siding meets the trim, which often have small openings that appear over time as the wood moves.

Why do you seal with metal instead of foam?

Because rodents chew, and foam and caulk can be chewed through. Metal mesh, steel wool and hardware cloth stay in place, and a cement or metal patch closes a larger gap.

Expanding foam is useful for filling a gap and stopping drafts, but a rodent can chew through it in a short time. A common approach is to pack the gap with steel wool or metal mesh and then seal the outside with foam or caulk, so the chewing rodent meets metal before it reaches the sealant.

Larger gaps, such as a broken foundation stone or a gap at a utility entry, are patched with cement or a metal plate. The patch is noted in the report so the homeowner knows which parts of the building have been repaired and which have not.

Should sealing happen before or after the animals are removed?

After. Sealing an entry with animals still inside traps them in the walls, where they die and cause odour, or where they find another way out.

The sequence matters. The trapping and bait work is done first, the animals inside are removed, and then the exclusion is carried out. A sealed house with an animal inside is a worse problem than an open one, because the animal cannot leave and will look for another route through the wall.

In a building where the activity is severe, the sealing is done in stages. The most-used entries are closed first, and the lesser ones after the population has dropped. The technician records the order so the homeowner knows what has been done.

What should a homeowner check after the sealing?

The entry points that were noted, the signs of activity and any new droppings. A sealed gap that is chewed or pushed open shows that the seal has been tested.

Walk the outside of the building once a month and check the sealed places. A gap that has been chewed or pushed open needs repair. Look for fresh rub marks, new droppings near the foundation and any new holes, and report them to the technician.

Inside, check the cupboard under the sink, the back of the pantry and the cellar corners. A new dropping in one of those places after the sealing means either a missed gap or an animal that was trapped inside and has since died. Either way, the technician needs to know.

• Walk the outside every month and check the sealed places
• Look for fresh rub marks or droppings near the foundation
• Report any sealed gap that has been chewed or pushed open
• Check the pantry and cellar for droppings after the work

Does exclusion change the cost of the rest of the job?

It can. A survey that finds many gaps may need more visits, and the sealing is scheduled and explained separately. The technician says at the first visit what the sealing involves.

The number of entry points decides how much work the sealing involves. A house with a few gaps around the utilities can be closed in one visit. An older building with many gaps may need a series of visits, and the work is planned in order of importance.

No price is given on this page. The technician confirms the scope and the cost on site before any sealing begins, so the homeowner knows what is included before they agree to the work.