We have a typical crawl space under home with several sliding vents around the foundation wall, an access door and a vapor barrier.  The vapor barrier is in good condition but joints at overlaps and at edges of walls are not sealed.  We need to access this space to turn on/off the outside shower water.  This is necessary to prevent pipes freezing in cold months.

In early May, before I got the vents opened there was condensation resulting in a small amount of moisture accumulation on the vapor barrier.  No signs of mold or wood being impacted by moisture.

I am wondering if anyone has encapsulated their crawl space?  Are you pleased with the results?  Can you tell me about how many square footage was encapsulated and what the approximate cost was?  Who did the work for you?

I am interested in how this might save on energy costs, (some reports suggest 18% per year savings).  Completely sealing the crawl space. Preventing moisture damage/mold potential.

Some studies suggest the current construction technique of concrete walls with vents is not recommended.

Any advice or experience would be appreciated.

Steve Tuttle