Our house has a poured concrete basement floor. Several cracks have occurred in the floor allowing a white foamy substance to seep through all around the cracks. What is it and how do I get rid of it? I'm worried about the heatlh risks. Any advice??

Bob Smith

It could be a number of things, however the two most common substances that are white and fuzzy are Efflorescence and Mold/Hyphae. Put on a latex glove and touch it. If it is gritty, it is probably efflorescence. If it falls apart with ease, it could be hyphae.

If you could supply a good close-up picture, I may be able to determine the substance. The only true way is to have it lab tested.

If it is mold, you should have it treated.