Mold inspection and testing in Spring Garden Township, PA

Spring Garden Township wraps around the south and east of the city and has been a separate municipality since it split off from Hellam Township in 1822 — long enough that the housing stock spans nearly the whole history of American residential construction. On one street you'll find attached twins built at the same time as the city blocks they adjoin. A mile away you'll find substantial early-twentieth-century houses on large lots in neighborhoods like Hillcroft and the streets running out toward Grantley. Newer infill has filled in around all of it. The township is still actively planning for what comes next, including comprehensive planning work undertaken jointly with York Township.

For a mold inspection, the variety means the job has to adapt, but two features recur across almost all of the older stock. The first is the basement. Foundations here are commonly stone or early block, parged rather than waterproofed, and a surprising number still have a section of dirt floor — often the oldest part, or under an original porch or addition, or a crawl-height area behind a partition wall. Bare soil in an enclosed space is a permanent moisture source. It releases water vapor continuously, with no leak and no event to point at, and the first thing to grow mold is the wood directly above it: the joists, the band board and the underside of the subfloor. When I inspect a house like this, that section gets readings before anything else, because it explains most of what people notice upstairs.

The second is the attic. A house built before the middle of the last century was designed with a leaky building envelope and very little deliberate attic ventilation, and it worked well enough because the whole house leaked air. Then somebody added insulation over the attic floor, replaced windows, sealed up the envelope, and installed a bathroom exhaust fan — and the attic became a cold, still space collecting the moisture the house produces. In deep winter I find frost on the underside of the sheathing and wet nail heads; by late February that has melted into the insulation and the framing. Do that for twenty winters and the sheathing carries dark staining along every nail line.

On the larger homes, retrofits add a third category. Central air conditioning in a house designed around steam or hot water heat means an air handler and ducts installed wherever they'd fit — usually the attic. Cold ducts in a humid attic condense on their own surfaces, and a torn vapor jacket or a silted-up condensate line puts that water onto the top of the ceiling below. I check pans, plenums, duct exteriors and drain lines as a matter of course on these houses because that's where the problem often is.

Along the township's northern edge, where the housing is attached and the lots are narrow, the pattern shifts toward what I see in the city: shared masonry, party walls that transmit a neighbor's water problem, and downspouts discharging a few feet from a foundation. Same tools, different question — there the job is usually determining which direction the water is traveling through the wall.

In all of it, the point of the inspection is to separate the moisture these houses have always carried from moisture something broke and let in. One is a maintenance item. The other is a repair with a deadline. Readings, thermal imaging and accredited lab data are how you tell them apart, and the report says which you have.