Lifespan by part
| Part | Expected life | What wears it out |
|---|---|---|
| Liner (12 to 20 mil) | 20 to 25+ years | Foot traffic, sharp debris, rodents |
| Seam tape and wall attachment | 10 to 20 years | Poor prep, moisture behind the liner |
| Rigid foam on walls | 25+ years | Almost nothing once installed |
| Vent seals and foam around pipes | 10 to 20 years | Settling, pests, new plumbing work |
| Crawl space dehumidifier | 5 to 10 years | Dirty filter, blocked drain, running in a vented space |
| Sump pump | 7 to 10 years | Cycling, debris, power surges |
| Access door | 15+ years | Weather and use |
What shortens the life
Thin liner
A 6 mil builder sheet tears in a season. 10 mil is the minimum for a real job. 12 to 20 mil is what you want if anyone will crawl on it.
Skipping drainage
Water under the liner floats it, breaks seams and pulls it off the walls. If water has ever pooled in the crawl space, a drain or sump belongs in the plan.
Other trades
HVAC, plumbing and cable crews crawl on the liner and sometimes cut it. Check after any work under the house and tape any cuts.
No maintenance on the dehumidifier
A clogged filter or drain line is the top cause of early dehumidifier death. Ten minutes twice a year prevents it. Replacement runs $1,200 to $3,000, as shown in the crawl space dehumidifier cost guide.
A simple yearly check
- Read the humidity. It should be 45% to 55%.
- Clean or replace the dehumidifier filter. Make sure water drains.
- Pour a bucket of water into the sump. The pump should kick on.
- Walk the liner with a flashlight. Tape any cuts, press down any loose wall edges.
- Check the access door seal.
Warranties in Charlotte
Most Charlotte crawl space companies warranty the liner for 10 to 25 years and the dehumidifier for 5 years through the maker. Ask whether the warranty transfers to a new owner and what yearly service, if any, it requires.
Questions people ask
Does the liner need replacing?
How often should the dehumidifier be serviced?
Can encapsulation fail?
Related services in Charlotte
More guides
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