Why is very important insulation and vapor barrier in the crawl space

A vapor barrier is an impermeable membrane that
blocks the flow of air through the building envelope. A
vapor barrier is an essential part of the building envelope.
Because the purpose of a vapor barrier is not obvious,
this important component is often omitted or installed
incorrectly.
The main purpose of a vapor barrier is preventing
the passage of the water vapor that is contained in air.
Vapor barriers and the insulation affect each other. They
must both be installed so that they interact beneficially
rather than harmfully.
Purposes of Vapor Barriers
The specific functions of vapor barriers are:
• protecting the envelope structure and insulation.

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