Crawl Space & Basement Insulation
Crawl space and basement insulation keeps floors warmer, can help lower energy bills and protects pipes and ductwork. Wetlock installs batt insulation, mineral wool insulation and radiant GPS foam board, and removes old insulation that is wet, has fungus growth or has fallen down.
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- Free Inspections
- Photos of Everything We Find
- Locally Owned in Rock Hill
- Written, Itemized Proposals
Compare Our Insulation Options
The right insulation depends on whether your crawl space or basement is vented or sealed and how much moisture is present. Wetlock installs three types.
Every insulation job includes removing and hauling away old insulation that is wet, has fungus growth or has fallen down.
| Features | Batt Insulation | Mineral Wool | Radiant GPS Foam Board |
|---|---|---|---|
| Moisture-resistant | — | ✓ | ✓ |
| Rigid board for foundation walls | — | — | ✓ |
| Metalized radiant face | — | — | ✓ |
| Treated to resist termites | — | — | ✓ |
| Focus | Cost-effective floor insulation between joists | Moisture- and fire-resistant for damp crawl spaces | R-10, fire-rated wall insulation for sealed spaces |
Insulation options
- Batt insulation: a cost-effective option installed between floor joists to keep floors warmer.
- Mineral wool insulation: dense, moisture-resistant and fire-resistant, a strong choice for damp Carolina crawl spaces.
- Radiant GPS foam board: R-10 rigid graphite polystyrene (GPS) board with a metalized radiant face. It is fire-rated, so it can stay exposed without a separate ignition barrier, and treated to resist termites. We fasten it to block or concrete foundation walls with rust-proof plastic fasteners.
Why insulation fails under Carolina homes
In a vented crawl space, humid summer air soaks into floor insulation until it gets heavy, sags and falls. Wet insulation stops working, holds moisture against the wood and gives pests a place to nest. That is why so many homes around Charlotte, Rock Hill and Columbia have insulation hanging down or lying on the dirt.
Why Moisture Control Matters Before Insulation
Insulation that stays damp loses much of its insulating value and holds moisture against the wood around it.
We fix the moisture problem before installing new insulation, usually with a vapor barrier, encapsulation or an AprilAire dehumidifier. In basements, insulation pairs with basement waterproofing so walls stay dry behind it.
What you get
- Warmer floors and a more comfortable home.
- Can help lower heating and cooling costs.
- Protected pipes and ductwork.
- Old, wet insulation removed and hauled away.
Signs you may need crawl space & basement insulation
- Insulation sagging or lying on the ground
- Wet or stained insulation, or fungus growth on it
- Cold floors in winter
- Bare joists with no insulation
- Higher heating and cooling bills
- Pests nesting in old insulation
How your project works
Free Inspection
We crawl the whole space or walk the full basement, take moisture readings and photograph everything.
Clear Explanation
We show you the photos, explain what is causing the problem and answer every question.
Written Proposal
You get an itemized plan with options and exact pricing. No pressure, no surprise add-ons.
Done Right
Our own crew completes the work, cleans up and walks you through the finished result.
Crawl Space & Basement Insulation FAQ
Which insulation is best for my crawl space or basement?
It depends on whether the space is vented or sealed and how much moisture is present. Batt insulation is a cost-effective choice between floor joists, mineral wool resists moisture and fire, and radiant GPS foam board insulates foundation walls in sealed crawl spaces and basements. We recommend the right one at your free inspection.
What is radiant GPS foam board?
GPS (graphite polystyrene) foam board is rigid insulation with a metalized radiant face. The board we install is R-10, fire-rated so it can be left exposed in a crawl space or basement without a separate ignition barrier, and treated to resist termites. We fasten it to block or concrete foundation walls with rust-proof plastic fasteners, and it holds up in damp areas where batts would soak up moisture.
Should I fix moisture before replacing insulation?
Yes. Insulation that gets wet loses its value and can develop fungus growth. We fix the moisture first with a vapor barrier, encapsulation, drainage or a dehumidifier, then install new insulation so it is better protected from moisture.
Do you remove old insulation?
Yes. We pull out wet, fallen or contaminated insulation and haul it away before installing new insulation.
Crawl Space & Basement Insulation near you
Based in Rock Hill, SC, serving the Charlotte and Columbia regions. Our primary markets:
Ready for a drier home?
Get a free crawl space & basement insulation inspection with photos and a written plan.