I have a house that has all exterior walls made from poured concrete,
no wood framing at all. The insulation on the interior is something
I've never seen before and looks to be actually part of the form to
pour the concrete into. It is black in color, very porous yet solid,
lightweight, about 2" thick, and crushes very easily - even between two
fingers. When it is crushed it turns to a sandy texture and emits a
foul odor, kind of like rotten eggs. My first thought was pumice, but
this comes in one foot wide by four foot long sheets. The house was
built in 1953 so if anyone knows what construction methods were used
back then and has any info please let me know. I'm just hoping its not
some type of asbestos, or something else that is hazardous.
sounds like asphalt board to me. It is available at the box stores in 4x8
sheets. Where I live they use it sometimes between the concrete and the
earth back fill.
Concrete wall above grade?
Do you live in a Edison house? Pictures please.
So do you, or anyone else, know what this stuff is made of? I tried
asking all kinds of people what it is and about 95% of them didn't
know what I was talking about. Those who did only saw it once, maybe
twice, and didn't know what exactly it is made of either. I'm pretty
confident it is the form the concrete was poured into and also doubles
as insulation. I know it isn't asphalt board as mentioned earlier, and
it definately isn't foam used in newer ICFs.
I beleive what you have is called FOAMGLAS. We have it at the chemical plant
that I work at as insulation on our pipes. I just spent the day ripping it off
one pipe. It definitely smells like rotten eggs. This is due to the hydrgoen
sulfide gas that is contained in the cells. The company that makes it provides a
safety data sheet that will inform you of any hazards. It can be found online at
the following address.
Click on the 'FOAMGLAS Insulation (all grades)' link and that will tell you all
you want to know.
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