I apologise in advance for the slight derail but......
Being a luddite from the UK, somewhere where we don't have "crawlspaces", or maybe we do, but as in good old states/blighty tradition, we call them different names!!
What is the purpose of a crawlspace, somewhere where.....er, skunks can enter and cause havoc, or any other critter. Plus crawlspaces, as far as I can see from countless other threads are a hindrance when you are setting up a humongously heavy aquariums as the floors always need support.
Can someone explain the advantages of a crawlspace, they must serve a purpose?
A crawl space provides support for the living areas above, and a buffer between the house and ground below.