Insulation, Radiant and Vapor Barriers - Vapor barrier

Im building an addition and I have started to insulate the inside walls, and after doing 2 walls and a couple of days later I have noticed moisture between plastic and insulation at the top...I can't go any further till I remedy this situation

The vapor barrier should be placed on the heated side of the room. The vapor barrier prevents warm, humid air from entering the wall and getting trapped in the wall cavity where it can cause moisture problems.

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The condensation at the top of the insulation illustrates the importance of an air barrier. Basically what occurred is warm air was escaping in that area and condensed on the insulation. Once you sheet rock the wall and ceiling, it will become your air barrier and the condensation should no longer occur in that area.

Greetings,

See my answer to bksrj60. You cannot prevent condensation in your application. The condensation can increase the heat flow (year around) by 50% or more, plus, the mold and water damage to the bottom plate when the moisture drains down.

If you want maximun efficiency, install a double layer radiant barrier. It's about 95% efficient and you won't have any of the other problems. Use a 3-4 mil thk product.

If you want installation instructions, let me know.

Thank you for considering my opinion.