Mold inspection & testing
Finding what is actually wet, where it is coming from, and whether testing is worth paying for in your situation.
What's involvedDark staining on roof sheathing usually means one of three things, and only one of them is a leak.
Most people discover attic mold by accident. Somebody goes up for Christmas decorations, or a home inspector photographs the underside of the roof deck during a sale, and there is gray or black staining across the plywood — often heaviest on the north-facing slope, which gets the least sun and stays coolest.
There are three usual explanations, and telling them apart changes the entire scope of work.
Staining that is localised, follows a run down a rafter, or clusters around a penetration, valley, chimney or vent stack points to water coming in from above. Macon's summer storms can drive rain at angles that a roof handles fine in ordinary conditions, and flashing details at chimneys and at the junction where an addition meets the original roof are the common failure points in older houses.
This is the one people never expect. Warm, humid air from the living space rises through gaps around recessed lights, attic hatches, plumbing penetrations and top plates, hits the cold underside of the roof deck in winter, and condenses. The result is uniform staining across large areas rather than a localised patch.
The most flagrant version of this is a bathroom exhaust fan or a clothes dryer that terminates into the attic instead of through the roof or a gable wall. It is far more common than it should be, and it delivers a concentrated stream of warm wet air directly onto the sheathing every time someone showers.
A properly working attic moves air from soffit vents at the eaves up to a ridge or gable vent. That path gets blocked in predictable ways: insulation stuffed into the eaves during an energy upgrade, blown insulation drifted over the soffit openings, painted-shut soffit vents on older houses, or a ridge vent that was installed without the sheathing actually being cut back underneath it.
Ask any contractor quoting attic mold work which of these three causes they have identified, and how. A bid that proposes to clean the sheathing without answering that question is proposing to clean it again in a couple of years.
Not every dark mark on roof sheathing is active growth. Old water staining, historic growth that has been dead for years since a leak was repaired, and the ordinary discoloration of aged plywood all look alarming to an untrained eye. A competent inspection distinguishes between active and inactive, which matters a great deal when a home sale hinges on the answer and a buyer's agent has seen a photograph.
Heat is worth mentioning too. A Macon attic in July, with heat index values outside pushing past 100 degrees, is a genuinely hazardous working environment. Expect attic work to be scheduled early in the day during summer, and do not go up there yourself in the afternoon to have a look.
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It can, depending on how much air moves between the attic and the living space. Most houses have more of that connection than their owners realize, through the attic hatch, recessed light housings, and leaky ductwork running through the attic. Air sealing is usually part of the fix anyway, since it also addresses one of the causes.
Home inspectors typically report what they observe rather than passing or failing anything, but “possible microbial growth on roof sheathing” in a report reliably triggers a negotiation. Getting it properly assessed and documented before listing, rather than during a ten-day due diligence window, puts you in a much better position.
Only if inadequate ventilation is genuinely the cause and there is no active leak or misvented fan. Adding a ridge vent while the bathroom fan still discharges into the attic solves nothing. And existing staining does not disappear on its own — it needs cleaning if you want the attic to photograph well for a sale.
If it has been repeatedly wet, has visible growth, or is matted down from water, it should come out. Insulation that is dry and merely dusty usually stays. Attic work is a good opportunity to improve insulation levels while everything is exposed, but treat that as a separate line item so you can see what you are paying for.
Attic work is arranged throughout the coverage area and is frequently flagged during home inspections.
Finding what is actually wet, where it is coming from, and whether testing is worth paying for in your situation.
What's involvedSealing the work area, removing what cannot be saved, cleaning what can, and drying the space down to a number.
What's involvedCleaning the joists, sealing the ground, and deciding whether to keep venting a space that vents humid air onto cool wood.
What's involvedDescribe what you're smelling or seeing and we'll pass it to an independent mold remediation contractor covering your part of Middle Georgia. The referral costs you nothing and commits you to nothing.