White Powdery Substance In Attic

It is not vermiculite it is not chalk it is not shredded paper saw dust or any of the common substances.

White powdery substance in attic.

After all some mold shows up as a white powdery material but more often in a crawl space than an attic. It is difficult to declare this one substance over another simply based on one s senses of sight or smell. Attic sheathing and framing. White deposits not dry rot dry rot will show as yellow to deep rust coloured deposits and will eventually produce full scale mushroom like fruits the easiest way to increase the ventilation in your roof space is to fit some tile vents.

That could indeed be and looks like a white fungus or mold growth on roof sheathing. Does anyone know what this substance is. There was multiple types of insulation in the attic. I have an older home with a mysterious white powder in the attic.

I found this stuff in the attic of a 75 year old home in louisville today. White mold tends to grow in high humidity environments rather than areas suffering from total saturation. If so you have either a natural negative pressure on the house or dominant supply duct leakage causing a negative pressure on the house which will make a house extremely dusty from every crack and crevice in the attic floor and everywhere else allowing air dust insulation particles etc enter in. Do you have white blown in fiberglass insulation in the ceiling.

In the end a sample probably should be analyzed by a mold lab technician to make sure what you are looking at. The powder is very fine like talc. This is why it s less common to see mold growth on base trim after a flooding event. The vast majority of attic mold is caused by humidity which is why white mold growth is common here.

I ve found newspaper scraps in the home dating form the late 20s so that is my guess for the construction date. But when i pinched a bead of the stuff it easily turned to power.