Biglerville is in the heart of northern Adams County's fruit belt and home to the National Apple Museum. Farmhouses, older borough homes, and orchards make up most of the area. North on PA Route 34, about 15 minutes from our office.
Farmhouses here have often grown in stages, with additions, porches turned into rooms, and outbuildings close by. Each addition brings a new foundation type and a new seam where water can get in.
Older homes in the borough itself have stone and block basements, and many use them for storage, which raises humidity and hides growth.
Quick answer
Biglerville Borough has about 520 homes, and 79.8% were built before 1980 (49.5% across Adams County). FEMA records 11 flood insurance claims in ZIP 17307, most in 1996. 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 | Biglerville Borough | Adams County | PA |
|---|---|---|---|
| Population | 1,070 | 106,115 | 13,018,639 |
| Housing units | 520 | 43,672 | 5,806,452 |
| Median year built | 1963 | 1980 | 1965 |
| Built before 1940 | 20.6% | 17.5% | 25.0% |
| Built before 1960 | 46.2% | 29.4% | 44.9% |
| Built before 1980 | 79.8% | 49.5% | 67.2% |
| Built 2000 or later | 3.3% | 22.3% | 14.3% |
| Single-family detached | 57.9% | 74.7% | 56.6% |
| Attached homes (rowhouse, twin, townhouse) | 4.6% | 9.3% | 18.8% |
| Mobile homes | 0.0% | 5.5% | 3.5% |
| Owner-occupied | 61.1% | 78.9% | 69.3% |
| Median home value | $222,000 | $268,500 | $254,500 |
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.
When the musty smell is worst in a single addition or back room, that section likely has its own moisture source. Each part of a house built in stages can behave differently.
A brown ring on the ceiling where an addition roof meets the original house usually means flashing at that joint is letting water in. Mold can grow on the sheathing and framing above long before the stain gets big.
Boards that cup, feel spongy, or lift at the edges in an enclosed porch are taking on moisture from below. The framing underneath is often in worse shape than the floor.
Closets on the outside walls of an old farmhouse stay cold because air barely moves in them. Gray or black spotting on the back wall or on stored clothing is usually condensation-driven growth.
Mudrooms, wash rooms, and attached sheds often share air with the house through gaps and doorways. A damp smell there can end up in the kitchen or family room next door.
A farmhouse that grew over several generations may sit on three foundations at once: a stone cellar under the original house, a block crawl space under a later wing, and a slab under an enclosed porch. Each one gains and loses moisture differently. Warm, humid air rising out of an unsealed crawl space through the stack effect carries that moisture into the rooms above.
Every place one roof meets another is a spot where water can get past flashing, and every place one wall meets another is a spot where siding and trim can open up. Those seams take on a little water every storm and dry slowly, which is enough to keep sheathing, sill plates, and joist ends damp.
Old farmhouse attics often have little insulation and uneven ventilation. In winter, warm moist air from the living space leaks up through ceiling gaps and condenses on the cold underside of the roof sheathing, sometimes as frost that melts on the first sunny day.
In Biglerville's fruit belt, farmhouses built in stages and borough homes with storage-filled basements account for most of the work.
Crawl spaces under additions and enclosed porches.
Enclosed porches and additions often sit on crawl spaces or slabs with no moisture barrier. We clean the framing, add a sealed vapor barrier, and deal with vents and drainage.
Stone and block basements used for storage.
Stone and block basements used for storage hold moisture behind boxes and shelving. We clear out moldy items, clean the walls and framing, and set up a dehumidifier.
Containment and negative air when dark growth has moved beyond one room of an older farmhouse.
When growth has spread through part of the house, we seal off the area and remove moldy materials under negative air.
Every service we offer is available in Biglerville.
We inspect the original house, each addition, and any enclosed porch on their own, with a moisture meter and thermal imaging at the seams between them. That shows whether one problem is spreading or several are happening at once.
Only the section with growth is contained, with plastic sheeting, negative air pressure, and HEPA filtration. The rest of the house stays usable while we work.
Moldy materials that cannot be cleaned are removed, and joists, sill plates, and sheathing are HEPA vacuumed and cleaned. Drying equipment runs until the wood reads dry, then we recheck before closing up.
Crawl spaces under additions get a sealed vapor barrier, and we point out flashing, gutter, or siding repairs at the seams for your roofer or contractor. Attics with frost problems get a note on where warm air is leaking up from below.
We look at how each addition ties into the original house, since those seams are where water gets in.
Biglerville is about 15 minutes up Route 34, so we can check drying equipment daily.
Porches turned into rooms often sit on a slab or crawl space with no vapor barrier and little insulation. Moisture comes up from below and condenses on the cold floor and walls. Checking what is under the floor is the first step.
Yes. Biglerville is about 15 minutes up Route 34 and is in our service area.
It can become one. Frost means warm, moist air from the house is reaching the cold sheathing and condensing. When it melts, the wood gets wet over and over, and dark staining on the sheathing is often the result. Sealing air leaks in the ceiling below is part of the fix.
Not always. Plaster itself is not a good food source for mold, and surface growth on painted plaster can often be cleaned. It usually comes out only when it is badly water damaged or the mold is growing on the wood lath behind it.
Yes, if the two share air. Doors that stay open, gaps around framing, and shared crawl spaces all let spores and damp air move between them. Addressing the moisture in the attached space keeps it from becoming a problem inside.
More answers on our mold FAQ page.
Call and tell us which part of the house is affected: the original house, an addition, or an enclosed porch.
