Tyrone Township is centered on Heidlersburg, where U.S. Route 15 meets PA Route 234 north of Gettysburg. Mailing addresses here vary, but the housing is mostly rural homes from the last few decades. North on U.S. Route 15 to the PA Route 234 interchange at Heidlersburg, about 15 minutes from our office.
The median home was built in 1985, and only 11% were built before 1940. That puts most houses at 35 to 45 years old: old enough that original bath fans, roof vents, windows, and attic insulation are wearing out, and new enough that nobody thinks of them as old houses.
There are no flood insurance claims on record in Tyrone Township. Mold here comes from inside the house: moist air from bathrooms and kitchens reaching the attic, humid crawl spaces, and slow leaks. About 1 in 5 homes is rented, so these problems can go unnoticed between tenants.
Quick answer
Tyrone Township has about 931 homes, and 41.5% were built before 1980 (49.5% across Adams County). FEMA records 84 flood insurance claims in ZIP 17325, 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 | Tyrone Township | Adams County | PA |
|---|---|---|---|
| Population | 2,294 | 106,115 | 13,018,639 |
| Housing units | 931 | 43,672 | 5,806,452 |
| Median year built | 1985 | 1980 | 1965 |
| Built before 1940 | 11.0% | 17.5% | 25.0% |
| Built before 1960 | 20.5% | 29.4% | 44.9% |
| Built before 1980 | 41.5% | 49.5% | 67.2% |
| Built 2000 or later | 28.6% | 22.3% | 14.3% |
| Single-family detached | 65.5% | 74.7% | 56.6% |
| Attached homes (rowhouse, twin, townhouse) | 2.9% | 9.3% | 18.8% |
| Mobile homes | 23.4% | 5.5% | 3.5% |
| Owner-occupied | 80.0% | 78.9% | 69.3% |
| Median home value | $220,800 | $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.
Dark staining on the roof boards near where a bath fan duct ends, or around a vent pipe, means moist air is condensing there in winter.
Insulation that feels damp or matted, or has rust spots from dripping nails, shows that moisture has been collecting in the attic for a while.
Hold a square of tissue under a running bath fan. If it does not stick to the grille, the fan is not moving enough air to clear the room.
In a one-story house over a crawl space, a musty smell that is worst in summer usually comes from humid crawl space air rising through the floor.
Closets on outside walls with little airflow show mold in corners and behind stored items, especially in a house with high winter humidity.
Tyrone Township has no flood insurance claims on record. The moisture in these homes comes from inside: people, showers, cooking, laundry, and the ground under the house. When that moisture cannot get out, it ends up on the coldest surfaces, which are the attic roof boards in winter and the crawl space framing in summer.
With a median build year of 1985, most homes here have bath fans, attic vents, and caulk that are 35 to 45 years old. Fans lose power, ducts come loose or were never run to the outside, and the moisture they are supposed to remove ends up in the attic or the bathroom ceiling.
About 1 in 5 homes here is rented. In a rental, a slow problem like a weak fan or a damp crawl space can go on for a long time before the owner hears about it.
Tyrone Township has no flood history to speak of. The work here is inside the house: attics, bathrooms, and crawl spaces in homes from the 1980s.
Roof sheathing mold from vents and air leaks in 1980s attics.
When a bath fan or kitchen vent ends in the attic, moist air condenses on the roof sheathing in winter. We remove or clean the moldy sheathing under containment and show you where the vent needs to be carried outside.
Bathroom and kitchen growth where fans have worn out.
Bathroom and kitchen mold in homes this age often traces to worn-out fans and failed caulk. We remove the growth and any damaged drywall, check the fan, and note what needs replacing.
Crawl spaces under rural homes and additions.
Crawl spaces under ranch homes and additions run humid in summer. We clean the framing, install a sealed vapor barrier, and address open vents that let damp air in.
Every service we offer is available in Tyrone Township.
We look at where each bath and kitchen fan duct ends, test how well it pulls air, and check the attic for intake and exhaust vents.
Attic, bathroom, or crawl space work areas are sealed off and kept under negative air pressure with HEPA filtration. Moldy sheathing, drywall, and insulation are removed or cleaned.
Bare soil gets a sealed vapor barrier, and open vents are addressed so humid summer air stops condensing on the framing.
We note what needs fixing: fan ducts carried outside, air leaks into the attic sealed, and fans upgraded where they are too weak.
Houses from the 1980s often still have their original bath fans and attic vents. We check each one, because a single bad vent can explain the whole problem.
For rental homes, we can work with the owner on access and leave written findings for both owner and tenant.
Mailing addresses around Heidlersburg do not always match township lines. It does not matter for service: we cover the whole area either way. Your township matters more for permits and local records than for mold work.
In homes like these, the usual sources are inside: a bath fan venting into the attic, a crawl space that runs humid in summer, or a slow leak at a toilet, tub, or water line. We measure moisture and humidity in each area to find which one it is before any work is planned.
Look in the attic above the bathroom. The fan should have a duct running to a roof cap or wall vent. If the duct ends loose in the insulation, or there is no duct at all, the fan is venting into the attic.
Attic air generally moves up and out, not down into the house, so attic mold is mostly a problem for the roof deck. It still needs to be fixed, both to protect the roof and because ducts or an air handler in the attic can carry it inside.
In summer, open vents let humid air in, and it condenses on cooler framing. Closing them only works if the soil is covered with a sealed vapor barrier and the space is kept dry. Closing vents on a damp crawl space without doing that can make it worse.
More answers on our mold FAQ page.
Tell us where you see the mold and roughly when the house was built. That usually points to the attic, the bathroom, or the crawl space before we arrive.
