Guide

Mold and the Home Inspection

Why inspection reports read alarming

Home inspectors work under standards of practice that typically exclude identifying mold, because doing so properly requires sampling and lab analysis. They are also writing a document that may be read later in a dispute. Both pressures push toward conservative, hedged language describing observations rather than conclusions.

So you get phrases like "apparent microbial growth observed on the roof sheathing," "elevated moisture readings noted," "musty odour present," and "recommend evaluation by a qualified specialist." Each is accurate and none of it tells you extent, cause or cost.

A buyer reading that fills the gap with their imagination, and their agent attaches a number to the imagination. This is the single most common reason a mold finding costs a seller several times what the actual work costs.

Where inspectors find it

• The attic, by opening the hatch and looking at the roof deck, usually the north slope. See attic mold
• The crawlspace, on joists and the underside of the subfloor. See crawlspace mold
• Basement walls, particularly the lower band on masonry
• Around windows and at exterior wall corners
• Under sinks and behind toilets
• At the HVAC air handler, in the drain pan and on the coil
• Any staining that suggests past or present water

Attics and crawlspaces produce most findings, because those are the two spaces a homeowner never enters and an inspector always does.

What to do as a seller

1. Get a scope before discussing money. A written scope with a real number turns an imagined problem into a defined one, and the defined one is almost always smaller
2. Find out what caused it. An attic finding is usually a ventilation or air-sealing problem, not a roof replacement, and that distinction is worth thousands
3. Consider doing the work rather than crediting. A credit is priced by the buyer's fear. The work is priced by a contractor
4. Get verification documented, because that document is what closes the subject. See post-remediation verification
5. Disclose properly. Pennsylvania's seller disclosure asks about known water infiltration and mold, and a documented resolved item reads far better than an omission that surfaces later. See selling a home with mold

What to do as a buyer

1. Treat the finding as information, not as a reason to walk. Most of these are solvable and many are inexpensive
2. Get a scope and a real number before you negotiate, so you are asking for something defensible
3. Insist that the scope names the moisture source. A quote that does not is quoting a cleanup you will repeat
4. If the seller does the work, ask for verification and the source-repair documentation, not just an invoice
5. Consider having your own independent assessor do the clearance rather than the seller's contractor
6. Remember that older housing stock in this county commonly has attic ventilation issues and damp stone basements, and both are ordinary rather than disqualifying

The findings that are usually cheap

• Attic deck growth caused by a bath fan venting into the attic. Reroute the fan, clear the soffits, clean the deck
• Surface growth on bathroom grout or caulk, which is cleaning and ventilation
• Window-frame growth from winter condensation, which is a humidity fix
• A crawlspace with bare soil and no ground cover, where a membrane does most of the work
• Staining from a leak that was genuinely repaired years ago, where a moisture meter settles it in minutes

The findings worth taking seriously

• Soft or spongy framing, which is decay rather than surface growth. See mold on framing
• A moisture source nobody has identified
• Growth across several unrelated areas, which suggests a house-wide humidity problem
• Evidence of repeated water events rather than one
• Anything behind a recently finished basement wall

If you have a report in front of you and are not sure which category you are in, call (717) 420-1964 and read the relevant lines out. Sorting a cheap finding from an expensive one usually takes a couple of minutes on the phone.

Common questions

Can a home inspector say it is mold?

Generally not. Most inspection standards of practice exclude identifying mold, because it requires sampling and analysis to confirm. They describe what they see, which is why reports say things like apparent microbial growth rather than mold.

The report says apparent microbial growth. How bad is that?

It means the inspector saw something that looked like growth and is required to describe it conservatively. It says nothing about extent, cause or cost. Getting a scope is the next step, not negotiating a number.

Should I get a mold inspection before listing?

If the house has any history of water, or an attic or crawlspace nobody has looked at in years, it is usually cheaper to know first. Finding it yourself means you control the contractor and the timeline. Finding it during someone's inspection means you do not.