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Why Use Vapor Barriers
25 May 2010
In
cold climates, insulation alone is not enough to keep our costly heat
from escaping. Given the slightest opportunity our precious heat will
find its way out in an alarming way.
Once we understand the
principle that warm air is attracted to cold air, and not the other way
around, it should become almost a matter of pride to keep that warm air
in! Although some heat is lost by conduction through the insulation,
most of the heat loss in a building is through air movement, or air
infiltration, through the walls.
That's where vapor barriers come in. A vapor barrier – also known as vapor retarder
– is merely a continuous sheet of impermeable material installed on the
inside, i.e. the warm side of the wall, and it's designed to keep the
warm air from escaping through or around the insulation and other
building components.
There are several reasons for wanting to keep the warm air inside the house through a vapor barrier installation; among them:
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