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  1. #1
    Join Date
    Nov 2009
    Posts
    3

    Default Adding Attic insulation

    I am adding insulation in an attic, there is existing fiberglass insulation from 40 years ago when house was built, I will be using formaldehyde free insulation from JM, is it advisable to first remove the old ins. which probably contains formaldehyde, or just install new over old ?

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Adding Attic insulation

    is it advisable to first remove the old ins. which probably contains formaldehyde, or just install new over old ?
    Any concerns of formaldehyde would be from "off gasing " however after that length of time I highly doubt there is any off gasing occuring.

    You should be fine with leaving the old insulation in place and cover over with the
    new ------- making sure not to use faced batts.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Jul 2009
    Location
    Northeast
    Posts
    661

    Default Re: Adding Attic insulation

    Follow this link for a wealth of off gassing info. Good Luck!!!

    http://www.wisegeek.com/what-is-offgassing.htm

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