Mold on my two week old vinyl window ?

Had all new vinyl windows installed in my house. All the windows are fine except the window in my spare bedroom where a tenant rents the room.

He keeps the door closed to the bedroom 24/7 and never opens the window. After only a week and a half, the vinyl window has black spots ALL over the window. It's also the only window with condensation.

I checked the humidity levels and the room is about 62% humidity.

I opened the bedroom door and am running a dehumidifier in there for now..

Anyone know exactly what the black stuff is? Is it mold? Some kind of fungus? It's truly amazing that it grew in under 2 weeks.

 

Welcome to the forums! Having no circulation of fresh, conditioned air, and a RH of 62%, I'd have to say it is a mold of some sort. Your profile isn't complete so we don't know where you are located. It would help knowing so we may could zero in on some specifics.

 

Thanks for the response! I am located in Seattle where during the winters, humidity levels are typically 80%+ from October - June.

 

Yeah, I would say it is a problem. Proper air exchange in that room will help tremendously. Is there any way to either shorten the door or install two sided vents in the door to help move air, since he keeps it shut all the time?

 

I'm pretty sure its dust from static electricity, not mold.

 

He's pretty easy going so I will ask him to keep the door open or at least the window open as much as possible. But if not, I will consider that idea, thanks!

I wonder what kind of mold it is... Can you believe it formed that quickly?

 

You know what, I think you're right. That same black "Dust" is all over his cob webs that line the sides of the walls and in the corners.

My window installer guy just emailed me back saying its likely dust and mold doesn't form that quickly. Interesting.. and disgusting

 

Use a rag that is damp with paint thinner to wipe it clean... then polish with a dry rag.

 

Makes you wonder what is causing black "dust". Almost as fine as fingerprint powder. If it is all over, then it probably isn't mold, but surely something in his environment. Does he smoke? Are the air filters changed regularly?

 

It could be mold spores... just airborne ones. Not growing on the vinyl. .. just attracted to it by the static electricity. (Or dust.)

 

He smokes but not inside the room. Although he goes straight from the outside to his room and shuts the door.. He never really leaves the room.

The black stuff does seem to be all over the room.. I'm hoping its "dust" and not mold spores.

There are no air filters of any kind in the room. What do you mean by that? By the way , he doesn't use heat in the room. It's never really that cold here in Seattle.

 

I was referring to your air handler filter for the entire house. How does he isolate heat/cool? How is air circulated in the house?