Attic mold removal
Attic mold removal that fixes the cause, not just the stain
White or black mold on the roof deck? We clean and treat the framing, then fix the ventilation and air leaks behind it so the mold doesn’t come back.
What you see on the roof deck
The roof deck is the wood under the roofing, the boards you see when you look up inside the attic.
Mold shows up there as black spots or a white film, sometimes over large areas. From downstairs, you notice it differently: a musty smell upstairs, a ceiling stain that keeps coming back, thick icicles along the roof edge in winter, a sign that warm air is making it up there.
Where it comes from
Mold needs moisture, and in an attic, that moisture comes up from the house. Warm air rises through leaks in the ceiling, around the hatch and the light fixtures. A bathroom fan that vents into the attic sends up the steam from every shower. And if the soffits are blocked, the air under the roof stops changing.
You can read the result on the wood: moisture condenses on the cold roof deck, and it turns black.
What not to do
Don’t bury it under a fresh layer of insulation. Insulation added on top hides the problem instead of fixing it, and the damage keeps going underneath. Washing the stains without dealing with the cause won’t fix anything either: as long as humid air keeps rising, the mold comes back.
How we deal with it
Decontamination
The roof deck is decontaminated wherever the mold has taken hold.
The cause
We seal the ceiling air leaks, install a baffle at every soffit and vent the bathroom fan, range hood and dryer outside. This is the part nobody sees once the job is done, and it’s what cuts off the moisture at the source. The details are on our attic ventilation page.
Reinsulation
Once the attic is healthy, we reinsulate to R‑51 minimum, at an even depth, with depth rulers.
When decontamination is part of the job, the timeline is set out in the quote.
The cause, fixed
Damp air goes outside, not into the attic
The steam from the bathroom, the range hood and the dryer ends up outside. As long as damp air rises into the attic, mold comes back; without it, it has nothing to come back on.
What stays with you
A decontaminated roof deck, and above all an attic where humid air from the house no longer rises. We fix the cause so the mold doesn’t come back.
FAQ
The questions we get the most
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- Mold in the attic, is that serious?
- Mold damages the roof wood, and it won’t go away on its own. Isolation Cornerstone treats it and, above all, fixes whatever brought it there.
- Can’t I just wash the stains off?
- A lot of people stop there, and it comes back. At Isolation Cornerstone, decontamination always comes with fixing the cause: the air leaks and the ventilation.
- White or black, does it make a difference?
- Not for us: we decontaminate and fix the cause either way.
- Do you reinsulate after?
- Yes, to R‑51 minimum.
- How long does it take?
- Longer than insulation alone. At Cornerstone, we give you the exact timeline in the quote.
- What if I have vermiculite too?
- Vermiculite goes first. At Isolation Cornerstone, it comes out before we decontaminate or insulate, and until then, leave it alone. It’s all explained on our vermiculite removal page.
Get your free quote
Tell us what you see on the roof deck. We’ll come look at the attic and show you where the moisture is coming from, and the quote is free.
Or call us at (438) 544-6512