Look at the picture below. You are in a crawl space looking at the moisture barrier that covers the floor of the crawl space. What's wrong?
HINT: Duct tape really has very little use in home construction.
ANSWER: Moisture does a real number on duct tape. Moisture is common in a crawl space. So using duct tape in the crawl space to hold the moisture barrier to the foundation block wall probably will not last very long. In fact it probably will take just a few days and it will look like the photo below.