Short answer: A crawl space is waterproofed by finding where water enters, improving exterior drainage when needed, managing low areas inside the crawl space, and planning drains or sump support before the vapor barrier and humidity-control system are finished. A liner should not be used to hide active water.
For the full service path, see how Catawba handles crawl space encapsulation in Charlotte, NC, including inspection, moisture control, drainage, vapor barrier work, and humidity control.
Drainage comes before the finished liner
If water is standing on the crawl space floor, the problem is bigger than ground vapor. Water may be entering from foundation-wall seepage, poor grading, downspouts, low crawl space areas, plumbing leaks, or a drain path that has nowhere to go.
Installing a clean liner over an active water problem can make the crawl space look improved while the same water pressure continues below or around the liner. The better sequence is to identify the water path first and then design the encapsulation around that condition.
What drainage details should be reviewed
The review should include downspout discharge, exterior grade, foundation wall stains, crawl space low points, door thresholds, plumbing lines, sump location options, and whether water appears after heavy rain or stays present in dry weather.
Catawba Crawlspace Co. uses those details to decide whether the crawl space needs simple corrections, interior drainage support, a sump pump plan, or a different sequencing before vapor barrier installation.
How drainage connects to humidity control
Waterproofing and drainage do not replace encapsulation. They support it. Once bulk water has a path, the vapor barrier can cover the soil, wall edges can be treated, seams can be sealed, and the dehumidifier can control air moisture instead of fighting a recurring puddle.
The end goal is not just a dry-looking crawl space. It is a crawl space that stays manageable after Charlotte rain, summer humidity, and normal maintenance visits.