Old Insulation - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 09-19-2010, 11:48 AM   #1
Join Date: Sep 2010
Posts: 1
Rewards Points: 10

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?


waterfallbilder is offline   Reply With Quote
Old 11-29-2010, 08:57 AM   #2
Join Date: Jan 2010
Location: WI - IECC Zone 6
Posts: 36
Rewards Points: 25

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.


DoItMyselfToo is offline   Reply With Quote
Old 11-29-2010, 11:18 AM   #3
Master General ReEngineer
Bondo's Avatar
Join Date: Dec 2007
Location: Chaumont River, Ny.
Posts: 6,651
Rewards Points: 1,708

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...
Bondo is online now   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cape Cod Style House Attic/Crawl Space Insulation Help Danielg Insulation 24 05-21-2012 08:20 AM
Adding insulation and storage to Cape Cod Side Attic turin39789 General DIY Discussions 5 11-08-2010 10:50 AM
How To Install Rigid Foam Insulation on Concrete earthad1 Building & Construction 9 10-26-2010 09:49 AM
attic insulation question dderolph Building & Construction 10 11-03-2007 05:21 PM
Installing new insulation in my basement and removing the old moldy insulation. Fixitgeorge Remodeling 3 10-17-2006 08:33 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1