You and/or your builder should read the article below from the U.S. Department of Energy - Energy Efficiency and Renewable Energy.
Crawl Space Insulation
Traditionally, crawl spaces have been vented to prevent problems with moisture...continued.
Traditionally, crawl spaces have been vented to prevent problems with moisture...continued.
Source: U.S. Department of Energy - Energy Efficiency and Renewable Energy
Be sure to read my article about Crawl Space Insulation.
Carl Heldmann