Finding and permanently sealing the entry points into Gaithersburg attics, crawl spaces, soffits and foundation voids.
Fastest: call (855) 974-4733. Or send this and we call you back.
Exclusion is the sealing half of pest work: finding every gap into an attic, crawl space, soffit or foundation void and closing it with materials that hold. It is what stops a cleared problem returning. Gaithersburg Pest Control arranges inspection, sealing and clean-up across Gaithersburg and nearby Montgomery County communities.
Trapping, treatment and clean-up all deal with what is already inside. Exclusion deals with the reason it got in, and it is the only part of pest work that keeps performing after everyone has gone home. On most buildings the list of gaps is short, specific and fixable, and nobody has ever looked at it.
The usual findings are dull and consequential: a torn or missing foundation vent screen, a crawl space hatch that no longer closes, a gap at the sill plate, a lifted soffit panel, an unscreened gable or roof vent, a dryer vent with a broken flap, the hole where a cable or refrigerant line enters, a garage door with a worn bottom seal, and the void where a deck ledger meets the siding.
This page does not name any wildlife species, because none were sourced for this area. That is not evasion; it is the honest position, and it changes nothing practical. The work is defined by the opening, its size and its location, not by a name, and the same sealing specification serves rodents, insects and anything else looking for shelter.
Do not enter an attic or crawl space you do not know. Low clearance, old wiring, nails, broken glass, standing water, loose ductwork and unsupported boards are the normal hazards, and nobody should go in alone. Do not sweep or vacuum dry droppings or nesting material; dampen, wear gloves and a mask, bag and wash afterwards. Do not seal an opening if anything may still be inside. Ring (855) 974-4733 and have the space inspected first.
The technician works the building from the ground up and from the attic down: foundation vents and hatch, sill plate, siding courses, utility penetrations, dryer and bathroom vents, soffit and fascia joints, gable and roof vents, chimney, and the garage.
This step is not optional. Sealing a building with animals inside is both inhumane and expensive, because what is trapped dies in a void, and the smell and the flies that follow cost more than the sealing did. Clearance comes first.
Hard closure at the opening: metal mesh or hardware cloth at vents, sheet metal or a rigid patch at penetrations, properly fitted vent covers, a replacement garage door seal, repaired soffit panels. Foam alone is a filler, never a barrier, because it gets chewed through.
Droppings, nesting material and soiled insulation are dampened, bagged and removed rather than swept, and the area is cleaned. Where insulation is heavily soiled, replacement is a separate piece of work.
Standing water or a missing vapour barrier in a crawl space, limbs touching the roof, a downspout discharging at the footing, soil built up over the siding line, firewood against the wall. Those are what make the void attractive in the first place.
Storms lift soffit panels and open trim joints, so a follow-up look, particularly after a hard winter or a wind event, is what keeps the sealing current.
Because trapping removes what is present and sealing removes the supply. An open building refills from the same gap within weeks, which is how a one-off problem turns into an indefinite trapping arrangement. Sealing also costs once, where repeat visits cost every time.
This applies to insects as much as to rodents. The gaps that admit a mouse also admit autumn invaders, and the brown marmorated stink bug work on the stink bug exclusion page is the same discipline applied to smaller openings.
Ask any quote to list the openings it covers, by location. A line that just says exclusion is not a specification, and it is impossible to check afterwards.
Hard materials at the opening: metal mesh or hardware cloth over vents, sheet metal or a rigid patch at penetrations, a proper vent cover, a new garage door seal, repaired soffit panels. Expanding foam and sealant are fillers behind a hard closure, not barriers in their own right.
Foam alone is the commonest failure. It looks finished, it photographs well, and it is chewed through. The same goes for steel wool stuffed loosely into a hole without anything over it, and for tape on a vent screen.
Fit matters as much as material. A vent cover that stands off at one corner, a hatch that catches and gets left ajar, a door sweep fitted to a warped threshold: each of those is an opening in practice however good the part was.
Clearance. Nothing living should be shut inside a void, both because it is inhumane and because the smell, the flies and the eventual removal cost far more than the sealing. An inspection confirms the space is clear, and sealing is scheduled after that, not alongside it.
This is the question to ask any contractor who offers to seal an attic on the first visit. The right answer involves checking, and often a short delay.
Where rodents are involved, the clearing work is covered on the rodent control page, and the two jobs are usually scheduled together in the right order rather than sold separately.
It belongs in the same conversation. A damp crawl space supports insects, encourages wood decay and makes the space attractive as shelter, so standing water, a missing or torn vapour barrier, a leaking pipe and a downspout discharging at the footing are all part of the exclusion job.
Carpenter ants in particular follow damp wood, and a damp sill plate above a crawl space is one of the commonest nest sites on local houses. The carpenter ant control page covers that, and the water is the shared cause.
Some of the fixes are outside: extending a downspout, regrading a flower bed that has crept above the siding line, cutting a shrub back off the wall. They are cheap and they keep working.
The number and location of openings, how much of the work is at height, the size and accessibility of the crawl space or attic, whether clean-up and insulation work are included, the condition of soffits, vents and the garage door, and whether clearance is needed first. Confirmed on site.
Access drives it. A crawl space with a reasonable hatch and clearance is a straightforward morning; one with low headroom, standing water and ductwork in the way is slow, careful work. Attic and soffit sealing at the top of a three-storey elevation is a different job again.
No dollar figures appear anywhere on this site, because no sourced local figure exists. Ask for the openings to be listed by location, so you can see what you are paying for and check it afterwards.
Vent screens, the access hatch, sill plate gaps, utility penetrations and the perimeter at ground level. Usually combined with a look at moisture, since a damp crawl space supports insects and wood decay as well as giving shelter.
Soffit and fascia joints, gable and roof vents, the chimney surround, vent flashings and any gap where a roof meets a wall. It is height work, and it is where most of the recurring problems on local houses actually originate.
Removal of droppings, nesting material and soiled insulation after a space has been cleared, with replacement insulation handled separately. It is worth doing properly, because a contaminated attic keeps smelling and keeps attracting.
Construction type decides the work, and the service area has all of it. Gaithersburg had 27,182 housing units at the 2020 census across eras from older frame houses to recent infill, and Rockville 27,953. Full basements, crawl spaces and slab-on-grade all occur within a few streets, so the opening list for one house tells you little about the next.
Rooflines are where the recurring problems sit in the subdivisions. Germantown, with 91,249 people in mostly mid-twentieth-century development, and Montgomery Village, planned in the late 1960s and 1970s, have long soffit runs, gable vents and attached garages, and a single lifted panel at a soffit return can serve a whole attic. In the townhouse clusters and in the alley-and-garage layout of Kentlands and Lakelands, the sealing has to consider the neighbouring roof space as well as your own.
Rural properties shift the emphasis to outbuildings and ground-level openings. Boyds and Barnesville, the latter with 68 residential units, rely on private wells and septic according to planning documents, and there the barns, stores and long foundation runs matter as much as the house. In a humid Mid-Atlantic climate with four seasons, autumn is the busiest period, because that is when shelter-seeking rises and when the state puts the stink bug flights from mid-September onward.
Most crawl space and attic exclusion calls are scheduled the same day when a technician is free, and you approve the price before any work starts.
Not sure if you're covered? Check your ZIP code.
Inspection, trapping and exclusion for rats and mice in Gaithersburg houses, townhouses and business premises.
Caulking, weather-stripping and sealing to keep brown marmorated stink bugs out of Gaithersburg homes before autumn.
Nest location, treatment and moisture repair for carpenter ants in Gaithersburg trim, sills, porches and decks.
Inspection-led treatment for household pests in Gaithersburg homes and rentals, with the plan explained before any work starts.
Rat complaints in Montgomery County go to the Department of Health and Human Services Vector Control Team.
Brown marmorated stink bugs fly to overwintering sites in the fall, and Maryland Department of Agriculture material gives mid-September through October for that flight.
No, and no one should. Sealing a void with something inside leaves a dead animal in the structure, followed by a smell and a fly problem, and the removal costs far more than the sealing. Clearance is confirmed first.
This site does not name local wildlife species, because none were sourced for this area. It also does not change the sealing work, which is defined by the size and location of the opening rather than by what used it.
Not on its own. It is a filler behind a hard closure. Rodents chew through foam, and a foamed hole that looks finished is the most common reason an exclusion job fails.
Only where it is soiled or compacted. Removal of contaminated insulation and replacement are separate pieces of work, and they should be quoted separately from the sealing.
Yes. The same openings admit autumn invaders such as brown marmorated stink bugs, and the University of Maryland Extension advice for those is exactly this kind of mechanical work: caulk cracks, weather-strip and remove window air conditioning units.
Once a year is sensible, ideally in late summer before shelter-seeking picks up, and after any wind event. Storms lift soffit panels and open trim joints, and a yearly look keeps the specification current.