The floor was only 2 yrs old but the concrete wasn't tested for moisture and most likely a cheap glue was used. It was really disgusting underneath!! 

Is this on a floor that you are replacing? Did you put the wood floor down or did you buy it like that?

I'm sure that is how many people end up with mold (the dreaded black mold) in their homes. Installers don't do the right thing when putting down a floor OR a DIY homeowner put down the floor not knowing what they were doing.

What are you putting down now? 

icky! Glad we decided to go with the dupont fake wood, love it and has the moisture barrier and plastic under it. 

It is a floor my company is replacing. But this is the first time I have seen this myself. A very reputable company put the floor in but I'm assuming the installer cut corners to make money. It was just so gross...totally molded under the wood (and the floors buckled). 

Yuck!

So if fake wood or tile had been put down, the mold would still be growing under those products, causing all kinds of respiratory problems. I'm assuming that the floor buckling and being replaced is how the moisture & mold problem was discovered. Interesting!

Wonder what causes the moisture? I grew up in apartments that had concrete floors, I do not remember them being moist, wet, sweaty, damp....even in the Houston humidity of summer, our floors were dry. So what causes the slab to become damp to grow the mold.

I know...to many questions! I'm just curious. We are fixing to replace our carpet with either tile or wood and I would hate to create a problem like mold. 

Yes, there is a machine that detects the moisture, one for the concrete & one for the wood. We generally do not have to use the moisture barrier glue but sometimes it is necessary. And yes, the glue on the back of the wood was the really moldy part. 

All I can saw is EWWWWW!!!

Thank goodness your company is getting it right. 

I didn't know it could do that 

Well...was trying to add the photo but it's been forever since I linked from photobucket so I can't find the right link :( 

That is horrible!!!

Isn't that the BLACK mold, stachybotrys-mycotoxins?

That stuff is dangerous. 

I refused to touch it & he finally threw it out. 

I don't blame you. I hope they were wearing respirator masks when removing that floor - or at least had the room well ventilated.