Insulation, Radiant and Vapor Barriers - Basement wall moisture barrier

I'm confused on how to install this. If you install this below grade how do you attach it. What holds it up & do you want it sealed to the wall.

No one has an answer or opinion.

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Question pertains to insulation and/or vapor barriers, regardless of where the materials will be used.

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A moisture barrier prevents the insulation from contacting the concrete below grade. This is important IMO, and is required by Code in my area.

It usually gets secured to the foundation with a furring strip running horizontally along the wall. It usually hangs down 2 feet below grade, but ideally, should extend all the way to the floor and sealed to your vapour barrier.

Having it start at grade level allows any excess moisture to escape above grade to the outside. Some people connect it to the top plate and this is a big "no-no" as it seals the wall cavity and traps moisture.

Check out this site for new thoughts on vapor/moisture barriers.


http://www.buildingscience.com/resources/foundations/Basement_Insulation_Systems-2002.pdf