Rodent Proofing and Exclusion in Pittsburgh
Trapping gets the rodents that are already inside. Proofing keeps the next ones out. In a city full of houses built before the Second World War, that second part is most of the job. A house from 1915 has had over a century of freeze and thaw working on its mortar, sills and window frames. Things move. Gaps open.
Proofing, or exclusion if you want the trade word, means finding every hole a rat or mouse can use and closing it with something they can't chew. Spray foam by itself doesn't count. Mice go right through it.
Call and tell us what kind of house you've got. The tech walks the outside and the basement, marks the gaps and quotes the work.
The same gaps, house after house
Every house is a little different, but the weak spots repeat across the city and the inner-ring boroughs. Most sit low, around the basement walls and sill. You'll know your house is leaking when you trap mice every fall and they keep coming back, when you can see daylight around a basement pipe, or when droppings line the walls but not the middle of the floor. Gnaw marks on door corners and dark rub marks around a hole in the foundation tell you the same thing.
- Crumbling mortar between foundation stones
- The gap where the wood sill sits on stone or block
- Old coal chutes and boarded-up basement windows
- Gas, water and cable lines coming through the wall
- Alley garage doors with a worn bottom seal
- Open ground under porch steps and back stoops
Mortar, mesh and metal, not foam
The materials are plain and they hold up: galvanized hardware cloth, sheet metal, copper mesh, steel wool packed with sealant, fresh mortar on stone or block. Vent covers go on dryer and bath vents. Door sweeps go on the basement and garage doors.
Most jobs pair the sealing with trapping, so the mice already inside get caught while the holes close behind them. That's the mouse side of it. If rats are digging along the foundation, the burrows get treated at the same time. A follow-up visit checks the traps. No new catches and no fresh droppings means the gaps are holding.
On hillside lots on Mount Washington, add the open space under decks and porches where the grade drops away. Hardware cloth buried along the bottom edge is a common fix.
Shared walls in row houses and twins
A lot of Pittsburgh is attached. Lawrenceville row houses, South Side rows, twins all over the East End. You can do a great job on your side and still hear mice if next door is wide open. The tech focuses on what you control: where joists sit in the party wall, pipes running between basements, and the front and back walls. Talking to the neighbor helps. Two sides sealed beats one. In a twin, the shared attic is the other weak spot. If the attic runs across both halves with no wall between them, mice cross over up there too, so ask the tech to look.
What you can patch on a Saturday
A new sweep on the basement door, a metal cover on the dryer vent, copper mesh stuffed around a pipe. All fair weekend work. Repointing a stone foundation or sealing roofline gaps two stories up is another story. That takes the right ladder and the right mortar. Sealing is often the biggest piece of a rodent job, so ask what's included in the quote and see what changes the price.
Questions We Get
Can I just use spray foam?
Not by itself. Rodents chew through it. Pair it with copper mesh, hardware cloth or mortar.
Can you really seal a 100-year-old house?
Yes. It takes more work than a newer place, but mortar, mesh and door sweeps close up stone and brick houses fine.
When's the best time to seal?
Late summer into early fall, before the first cold nights. Low gaps are worth doing in spring, when rats start digging.
Serving Lawrenceville, South Side Flats and Slopes, Bloomfield, Squirrel Hill, Shadyside, Mount Washington, Polish Hill, Brookline, Mt. Lebanon, Millvale.