Fredd Wright wrote:

On Monday, April 25, 2016 at 10:42:32 AM UTC-4, DerbyDad03 wrote:
That makes me think that the plastic might be a good idea after all.
if for no other reason, it could keep dirt and weeds from coming up
through the cracks.

Dirt doesn't come up. Weeds need both water AND light to grow...does your
crawl space get those (I hope not)?