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Re: Covering fiberglass insulation in attic?

To: Shop Talk <shop-talk@autox.team.net>
Subject: Re: Covering fiberglass insulation in attic?
From: Douglas Shook <shook@usc.edu>
Date: Tue, 01 Feb 2000 18:04:40 -0800
Mike Lee - Team Banana Racing wrote:

> I'm worried that I might
> be doing a no-no and trapping moisture in there.

Mike,

Assuming that your fiberglass bats have kraft facing on the
bottom (a paper backing that should be against the "interior", or
against your sheet rock), that should provide a vapor barrier,
and trapped moisture should not be a big deal.

If you wanted to be safe, you could lay the 1/8" brown peg board
across the tops of your joists to make a floor in your attic,
trap the fiberglass inside and still provide for some
ventilation.

A good coat of oil-base paint on the ceiling also provides an
additional vapor barrier to keep the moisture from getting into
the insulation.

Unless you are using an un-vented heat source in your garage, you
should not have much moisture problems anyway.  The moisture
problems usually associated with damp attics come from sources
that put a good deal of water vapor into the air of the house
(cooking, boiling water, taking long steamy showers, humidifiers,
etc.).  

Again, unless you have an un-vented gas or kerosene heater in
your garage, you should not be at risk, anyway.

doug

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