Mount Pleasant Township surrounds the borough of Bonneauville and stretches east along York Road, Hanover Road, and Two Taverns Road. It is mostly farmland with homes spread along the roads. East of Gettysburg between York Road and Hanover Road, about 10 minutes from our office.
Older farmhouses here often have stone or block foundations and basements that were never meant to be living space. Converting them into finished rooms is common, and it is where hidden moisture problems start.
Barns and outbuildings sometimes share walls or airflow with the house, and stored hay, feed, or firewood near the house adds moisture and mold spores to the air.
Quick answer
Mount Pleasant Township has about 2,012 homes, and 36.8% were built before 1980 (49.5% across Adams County). FEMA records 10 flood insurance claims in Mount Pleasant Township, most in 2021 (Hurricane Ida). Published national benchmarks put a typical mold remediation project at $1,223-$3,757 (Angi) to $1,500-$6,000 (HomeGuide); a written quote after inspection sets the real price, and the first step is always finding the water.How costs break down.
How old the homes are, how many share walls, and how often water has come in, compared with Adams County and Pennsylvania.
| Measure | Mount Pleasant Township | Adams County | PA |
|---|---|---|---|
| Population | 4,709 | 106,115 | 13,018,639 |
| Housing units | 2,012 | 43,672 | 5,806,452 |
| Median year built | 1989 | 1980 | 1965 |
| Built before 1940 | 10.1% | 17.5% | 25.0% |
| Built before 1960 | 19.3% | 29.4% | 44.9% |
| Built before 1980 | 36.8% | 49.5% | 67.2% |
| Built 2000 or later | 33.6% | 22.3% | 14.3% |
| Single-family detached | 69.0% | 74.7% | 56.6% |
| Attached homes (rowhouse, twin, townhouse) | 9.1% | 9.3% | 18.8% |
| Mobile homes | 15.0% | 5.5% | 3.5% |
| Owner-occupied | 83.4% | 78.9% | 69.3% |
| Median home value | $289,400 | $268,500 | $254,500 |
Named events with claims in Mount Pleasant Township: Hurricane Ida 2021 (3), Flooding 1996 (1).
Sources: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates, tables B01003, B25001, B25003, B25024, B25034, B25035 and B25077 (profile); FEMA OpenFEMA NFIP redacted claims, data as of 2026-09-08. Municipal claims use FEMA's NFIP community; ZIP claims use the reported ZIP code, which can cross municipal lines. ACS figures are survey estimates with margins of error, and small places have wider margins. Paid amounts are not adjusted for inflation.
On cold mornings, white frost on the roofing nails poking through the sheathing means warm, wet house air is reaching the attic. When it melts, it drips onto the insulation and wood.
Wood paneling or drywall that bows away from a stone or block wall is absorbing moisture from behind. Mold is often growing on the back side where it cannot be seen.
White or green growth on logs, boxes or seasonal gear stored in the basement shows the air there is humid enough for mold. Those items also add spores and moisture to the space.
Paint flaking off masonry in sheets means water is pushing through from the soil side. The wall is not dangerous in itself, but anything framed against it is at risk.
In older farmhouses, the bathroom fan often ends in the attic rather than outdoors. If the attic above it smells or the insulation looks stained, steam has been going to the wrong place.
Farmhouse basements were built to store food and fuel, not to be living space. Their stone or block walls pass moisture from the soil, and the space stays cooler than the house above, which keeps relative humidity high most of the year. When a basement is finished with studs, insulation and drywall set tight against that wall, the moisture that used to evaporate into the room gets trapped where the wall can't dry.
Attics tell a similar story in reverse. Many older farmhouses have no soffit vents, little insulation, and open paths from the living space into the attic around chimneys, plumbing and old light fixtures. Warm air carries water vapor up through those gaps, and in winter the roof sheathing sits well below the dew point. Moisture collects there night after night, and a bath fan dumping steam into the attic adds to it.
Storage habits add to the load. Firewood brought inside to season can release a great deal of water as it dries, and it often carries mold on the bark already. Hay, feed and damp equipment in a barn or shed close to the house raise spore counts in the air around it, which doesn't cause mold on its own but gives any damp surface a head start.
Mount Pleasant Township is mostly farmhouses and homes along the roads east of town. Converted basements and poorly vented attics are where most of the mold turns up.
Removing moldy finishes in converted basements and managing moisture in the old walls.
Old stone and block basements finished with drywall and carpet trap moisture against the wall. We remove the moldy finishes under containment, dry the space, and talk through how to rebuild so the wall can dry, if you want to keep the room.
Cleaning sheathing and fixing the ventilation that let condensation build.
Attics in older farmhouses often have no soffit vents and little insulation. We clean the sheathing, then look at air sealing the attic floor and adding ventilation so winter condensation stops.
Checking an older farmhouse before buying or finishing the basement.
If you are buying an older farmhouse or planning to finish a basement, an inspection first shows where the moisture is and what it would take to keep it dry.
Every service we offer is available in Mount Pleasant Township.
Attic and basement problems in these houses are often linked by air moving up through the building, so we inspect both. Moisture readings behind finished walls and a check of where bath fans actually vent show how the moisture is traveling.
Paneling, drywall and insulation with growth come out under containment with negative air pressure. Attic sheathing is cleaned in place where the wood is sound, and HEPA vacuuming picks up settled spores.
Framing is dried and checked until it reads normal, and the stone or block wall is left open long enough to stop wicking into new materials. If you plan to refinish, we talk through materials that tolerate a damp wall.
Common recommendations include venting the bath fan outdoors, air sealing the attic floor, adding ventilation, and moving firewood and storage out of the basement. A dehumidifier holding the basement near 50% protects whatever you rebuild.
Barns, sheds and stored firewood near the house add humidity and spores. We note anything stored against the house or in the basement that is adding to the problem.
Farm schedules are busy, so we plan visits around what works for you.
It can be, but the walls need to manage moisture first. Framing should stand off the stone, materials should tolerate damp, and humidity has to stay under about 60%. An inspection before you build is much cheaper than tearing out a finished room later.
Warm, moist air from the house rises into a cold attic and condenses on the underside of the roof. Without enough ventilation, it stays wet and mold grows. Cleaning it and fixing air sealing and ventilation together is what stops it returning.
It is better kept outside under cover and brought in a day or two before burning. Green or wet wood gives off moisture as it dries and often carries mold spores on the bark. In an already damp basement, a large woodpile can push humidity past 60%.
EPA guidance suggests that a homeowner can usually handle an area under about 10 square feet with proper protection, provided the moisture problem is fixed. Larger areas, growth inside walls or in HVAC systems, or anyone in the home with health concerns are good reasons to call a professional.
Spores travel on air and on clothing, so a moldy barn or shed near the house raises the number that come inside. They only grow where they land on something damp, though. Keeping indoor humidity low and the house dry matters more than the barn.
More answers on our mold FAQ page.
Tell us whether the problem is in the basement, the attic, or both, and whether the basement has been finished. That shapes the visit.
