Crawlspace Insulation In New Jersey
How you insulate a crawlspace depends on whether it’s ventilated or unvented. Most building codes require vents to aid in removing moisture from the crawlspace. However, many building professionals now recognize that building an unvented crawlspace (or closing vents after the crawlspace dries out following construction) is the best option in homes using proper moisture control and exterior drainage techniques.
If you have or will have an unvented crawlspace in your New Jersey home, the best approach is to seal and insulate the foundation walls with close cell spray foam rather than the floor between the crawlspace and the house. This strategy has the advantage of keeping piping and duct-work within the conditioned volume of the house so these building components don’t require insulation for energy efficiency or protection against freezing.