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- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!darwin.sura.net!dtix!mimsy!afterlife!ahw
- From: ahw@afterlife.ncsc.mil (Andrew White)
- Newsgroups: misc.consumers.house
- Subject: Re: Attic Insulation
- Message-ID: <1992Dec30.201557.888@afterlife.ncsc.mil>
- Date: 30 Dec 92 20:15:57 GMT
- References: <92351.160109RMCCU@CUNYVM.BITNET> <13755@limey>
- Organization: The Great Beyond
- Lines: 17
-
- i recently saw an article in popular science discussing rating and
- actual r-values of fiberglass. seems a major flaw was discovered in
- current installation practice that greatly effects the r-value.
- normally bats are rated in a machine that seals the batt and test
- the temperature delta given different thickness's. however, when
- it's installed there are no sealed boxes around the batts in the
- attic. what occurs is a thermal effect whereby the cooler air
- descends and the warmer air ascends through the batt. thus with no
- air movement you still are getting significant air transfer in the
- batt. the solution to the air infiltration was to put the batts in
- bags before installing, thus preventing air flow through the bat.
- the article mentioned these were imminently going to market in
- many of the major building centers, home depot etc.
-
- has anyone seen this, heard about it or have any other info relating
- to this effect? the article was within the last 6 months and in the
- home products section
-