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Old 09-19-2010, 11:48 AM   #1
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old insulation


i am getting ready to lay batting in the attic , there is old insulation that is flattened down to almost nothing paper facing up with vermiculite on top , shoul i remove before i put the new up in the attic?

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Old 11-29-2010, 08:57 AM   #2
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old insulation


I live in Wisconsin. Here the Department of Health Services treats all vermiculite as asbestos containing material (ACM). Everything that I have read from doing Google searches says not to disturb vermiculite insulation but to instead have a professional abatement company remove it. Also, at this point there is no uniform sampling/testing protocol for vermiculite. From what I'm told, the problem is that the asbestos fibers migrate down over time, so if a sample is taken from the surface an inaccurate asbestos content could result in the test. The other issue is that it's possible that the asbestos is not evenly distributed throughout the area of the attic, so a sample in one corner of the attic might contain asbestos but the other corner does not, for example. So, depending on where in the attic the sample is taken could give a different test result.

I just purchased a home this year that contained vermiculite insulation in the attic. I hired a professional company to vacuum it out using an industrial HEPA vacuum pulled behind their truck. The attic was kept under constant negative air pressure so all the air the house tended to flow toward the attic, so if dust was generated it would not migrate to the rest of the house. Also, after the attic was vacuumed, then the entire attic was fogged with a drylock spray to capture any possibly remaining fibers and lock them down to the attic floor.

My 2 cents.

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Old 11-29-2010, 11:18 AM   #3
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old insulation


Quote:
Here the Department of Health Services treats all vermiculite as asbestos containing material (ACM).
Ayuh,... The Typical nanny state response,...

Asbestos contamination came from only 1 mine, 'n only resulted in a tiny percentage of materials used in homes...
I'd leave the old insulation be, 'n just cover it with new stuff...

I've got 2 places with it, 'n grew up in a house Full of it...
It ain't goin' nowhere, unless you distrub it...
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