Mold Inspection and Testing in the City of York, PA

York is the oldest and densest housing stock I work in. Most of what I inspect inside the city went up before 1940: brick rowhouses and twins on tight lots, stone or early block foundations, plaster on lath, and cellars with a dirt floor or a thin slab someone poured over one later. None of it was built with a vapor barrier, a sealed foundation or a mechanical way to dry the air, because none of that existed yet.

That changes what a mold inspection is looking for. Out in the townships I'm usually chasing a single failure — a bath fan venting into the attic, a sump that quit, a grade that slopes back at the house. In a city rowhouse the moisture is more often structural and continuous: cool masonry in contact with the ground, giving off water vapor every day of the year into a cellar nobody ventilates. That by itself isn't a problem. It becomes one when the cellar gets finished, when storage goes against the walls, or when the air from down there ends up in the bedrooms — which it does, because air moves up through a house.

The party wall is the thing people don't expect. In a row or a twin you own half the brick. If the house next door has a downspout dumping at the foundation, open mortar joints, or is vacant and unheated, you get damp plaster on your side and there is nothing you can fix on your own side to stop it. A lot of my city inspections end with me telling a homeowner that their wall is wet and the cause is fifteen feet away through the masonry. That's worth knowing before you pay someone to re-drywall it.

Then there's the water that's already been through. The Codorus Creek runs right through town, and in June 1972 Agnes flooded these neighborhoods badly — the Susquehanna crested more than fifteen feet over flood stage and Codorus flooding killed a man off the Richland Avenue bridge. That flood is history, but the low ground is still low ground, and a lot of these basements have been wetted and dried many times over since. Old flood water doesn't keep growing mold by itself. The finished wall, the framing, the carpet and the boxes that got wet and never properly dried are what I'm actually looking for.

And a large share of city housing is rented or was converted. Single-family houses cut into two or three units, baths and kitchens added where there was no plumbing before, fans installed later and vented into a joist bay instead of through the wall. Those buildings generate the landlord-and-tenant disputes I get called into, and they're the reason I sample on more than one floor.

My job is to work out which of those you have and prove it with numbers instead of opinions — moisture readings, thermal imaging, and accredited lab results from samples taken where they answer something.