Control ground moisture and water entry with a crawl-space plan based on drainage, framing condition and the building’s ventilation needs.
The Department of Energy guide to crawl-space ground barriers describes liquid water and water vapor entering from the soil. It recommends a continuous sealed ground barrier and measures such as grading and drainage to address bulk-water entry.
At a Savannah property, inspect standing water, plumbing leaks, timber and existing equipment before choosing an enclosure. The design should account for humidity control, combustion safety, termite inspection access and any required flood openings. A liner does not replace structural repairs.
Crawl Space Encapsulation
Deal with the water first. Sealing a liner over standing water traps the problem. Grading, drainage, and a sump where it's needed come before the plastic.
Heavy liner, sealed – not a loose sheet. A reinforced vapor barrier across the ground and up the piers and walls, with seams and penetrations sealed and the edges mechanically fastened.
Close and seal the vents. Half-measures leave a humid-air path straight back in.
A dehumidifier sized to the space. An undersized household unit runs constantly and never wins. Sizing matters more than brand.
This is generally a mid-range job, priced mostly by square footage and whether water management is needed first. It is also the one with the clearest return on the structural side: it's what stops you paying for joist replacement a second time.
Elevation readings, a look at the actual failure, and a written scope with a real number – before you commit to anything.
That was the standard assumption for decades, and it works in a dry climate. In coastal Georgia, outdoor summer air is often more humid than the crawl space it's venting into, so the vents raise humidity against the framing instead of lowering it. Sealed-and-conditioned is now the widely accepted approach for this climate.
Humidity control must be part of the design. A dehumidifier may be appropriate, but its need and size depend on measured conditions and the planned conditioning or ventilation approach. Ask how humidity will be controlled and verified after installation.
No. Moisture control does not restore damaged framing or settled supports. Inspect those separately and repair what the findings justify; encapsulation should not be presented as a complete answer to every sagging floor.
Illustrative scenarios, not completed customer projects. The inspection and agreed scope determine the work for your property.
For Savannah-area crawl spaces, identify bulk-water entry before choosing a membrane or humidity equipment. Moisture control and structural support repair solve different problems.
Local reference: U.S. Department of Energy crawl-space moisture guidance.
The inspection is free, and if the answer is that it can wait, that's what we'll tell you.
Savannah Foundation Repair Co