Can asbestos leach from conrete roof?

GodlikeRed

Hi all,

So there is white 'powder' falling from the roof in my garage, I'm worried it might be asbestos.

I've read might also be efflorescence, salts leaching from the concrete.
But I was wondering if anybody knows if its possible for asbestos to leach from concrete and form a 'powdery' substance.

Many thanks,


L

Calahonda52

rather than answer
the wrong question why not post a picture?
Is the roof solid concrete or is it a corrugated asbestos sheeted roof or WHA?

GodlikeRed

You're dead right actually.

http://imgur.com/gallery/8XGUT/new

Thoughts?

Euthro

Asbestos is virtually non-soluble, it is also non-friable when in a concrete mix, if the concrete is confirmed to contain asbestos it is safe as long as it remains in good condition, cracking or flaking of asbestos containing materials is what makes it friable and therefore dangerous.

Friable: easily crumbled ie could easily become airborne

GodlikeRed

Thanks for that.
The roof doesn't look damaged or cracked. So I'm fairly certain it is efflorescence. I live in an estate and nobody else has reported problems.
Also I was up on the garage roof a few times during the winter and noticed some pooling of water. I'm guessing it seeped through the garage tar roof (not sure the exact term for it).

Calahonda52

Its concrete, effervescent, etc

GodlikeRed

Cheers