Crawlspace Insulation in Greenville, South Carolina
Permanent fixes from a local Greenville-based crew. Free written estimates, 25-year material warranty, same-week scheduling.
- Licensed & Insured in South Carolina
- Locally Owned, Greenville-Based
- 25-Year Warranty on Encapsulation
- Free On-Site Estimates
- 0% Financing Available
What Crawlspace Insulation Means in the Upstate
If your floors feel cold in winter and your downstairs HVAC works overtime in summer, your crawlspace insulation is the culprit. Most Greenville-area homes built before 2010 still have sagging or missing fiberglass batts that act more like air filters than insulation.
Modern crawlspace insulation in Upstate SC means rigid foam board installed against the foundation walls — not fiberglass batts stuffed between floor joists. The reason: the IECC 2021 climate zone 4A code (which covers the Greenville area) explicitly recommends wall insulation for sealed crawlspaces. Wall insulation creates a continuous thermal barrier and pairs with encapsulation; floor insulation between joists doesn’t, and traps moisture against the sub-floor. Rigid foam is moisture-resistant, rodent-resistant, and lasts the life of the home.
We’ve handled hundreds of crawl space insulation projects across Greenville, Greer, Mauldin, Simpsonville, and the rest of the Greenville metro. Every crawlspace we touch starts with a written inspection report and ends with a transferable warranty. No high-pressure sales, no surprise add-ons.
Project Details
| Pricing | Quoted per job after free on-site inspection — every quote is itemized in writing |
|---|---|
| Install Timeline | 1-2 days |
| Warranty | 25-year material warranty + transferable workmanship |
| Permitting | Not required for most jobs in Greenville County; we handle permits when needed |
| Financing | 0% promotional periods available through Hearth, Synchrony, GreenSky |
Our Process
- Old insulation removal. We pull out and bag any existing fiberglass — almost always wet, compressed, or rodent-damaged.
- Foundation wall prep. Brush off debris, fill gaps with foam, and ensure the surface accepts adhesive.
- Foam board installation. 2-inch panels are glued and pinned against the wall, butted tight, and sealed at every seam.
- Rim joist spray foam. Closed-cell spray foam seals the rim joist around the entire perimeter.
- Cleanup + verification. All old materials hauled off. Final thermal imaging optional — we can show you the before/after.
Materials We Use
We don’t shop the lowest bid — we use materials we’d put in our own homes. Here’s exactly what goes into a typical crawlspace insulation job:
| R-10 rigid foam board (Owens Corning FOAMULAR) | Two-inch closed-cell extruded polystyrene. R-10 rating meets code for our climate zone with room to spare. Doesn’t absorb moisture, doesn’t compress over time. |
|---|---|
| Foil-faced for vapor barrier integration | The foil face seams with our 20-mil vapor barrier for a continuous moisture envelope. |
| Closed-cell spray foam for rim joist | The rim joist (where floor joists meet the foundation) is a major air leak point. We spray closed-cell foam at the rim and seal it air-tight. |
| Mechanical fasteners + adhesive | Foam board is both glued to the foundation wall and pinned with masonry fasteners — no shortcuts. |
Common Scenarios We See
Every crawlspace insulation project starts with a different complaint. Here are the most common situations we walk into:
Cold floors in winter
Single biggest complaint we hear. Wall insulation paired with encapsulation typically brings crawlspace temperatures within 5-10°F of the upstairs ambient.
Rodent activity in old fiberglass
Mice love fiberglass batts — they’re nesting material. Removing fiberglass and replacing with foam board eliminates the habitat.
Failed HVAC ducts in crawlspace
If your duct insulation is hanging or missing, we can re-insulate or replace it as part of the crawlspace package.
New owner doing a ‘fresh start’
When you buy a home with an unfinished crawlspace, doing the insulation right the first time is much cheaper than doing it in pieces.
Why Greenville Homes Need This
The Upstate sits in climate zone 4A — hot, humid summers and freeze-thaw winters — which is the toughest possible combination for an open crawlspace. Add red Piedmont clay (which holds water like a sponge) and the high water table around the Reedy River corridor and you have a region where every older home eventually has a crawlspace problem. The good news: it’s almost always fixable, and the fix pays for itself in energy savings, mold prevention, and resale value.
Frequently Asked Questions
What kind of insulation is best for a Greenville crawlspace?
After encapsulation, we install rigid foam board on the foundation walls instead of fiberglass under the floor joists. Foam board resists moisture and provides a continuous thermal barrier — the modern standard in our climate zone (4A).
Should I replace old fiberglass insulation?
If it’s sagging, wet, rodent-damaged or older than 15 years, yes. Wet fiberglass holds water against your sub-floor and breeds mold. We haul off the old material as part of the job.
How much does it cost to insulate a crawlspace in Greenville?
Rigid foam wall insulation on a 1,500 sq ft crawlspace runs about every job is different — we provide a free written estimate after the inspection installed. Removing old fiberglass adds a fair amount-a fair quoted amount depending on quantity and condition.
Will new insulation lower my energy bill?
Most Greenville homes see a 10-15% reduction in winter heating bills and a noticeable improvement in floor comfort within the first week.
Do you insulate ductwork in the crawlspace?
We can. If your supply ducts run through an unconditioned crawlspace they should be wrapped — encapsulation usually eliminates the need but in semi-conditioned spaces we still recommend it.
Will rodents nest in the new insulation?
Not in rigid foam — there’s nothing to nest in. That’s a major upgrade from fiberglass, which mice love.
Is rigid foam fire-rated?
Yes. The foam board we use is fire-rated and code-compliant for our climate zone. Some inspectors require a thermal barrier covering, which we can add.
What’s the R-value of rigid foam vs fiberglass?
Two inches of XPS foam = R-10. Six inches of fiberglass batt = R-19 nominally, but typically R-13-14 effective due to compression and air gaps. Foam holds its R-value forever; fiberglass degrades.
Can I do this myself?
DIY foam board installation is possible but tricky in a sealed crawlspace — you need to seal every seam to maintain the moisture envelope. Most DIY jobs leave 10-20% of gaps that defeat the purpose.
Will my home feel warmer in winter?
Yes — floor surface temperatures typically rise 5-10°F, which is the difference between ‘cold to step on’ and ‘comfortable’.
Service Areas We Cover
Crawl Space Insulation is available across Greenville and these surrounding communities: Greer, Mauldin, Simpsonville, Taylors, Easley, Travelers Rest, Berea, Wade Hampton.
Other Crawlspace Services
Crawlspace work often touches multiple systems. If you’re doing one of these, the others usually pay to address at the same time:
Warranty in Detail
The rigid foam board insulation we install carries the manufacturer’s 25-year thermal-performance warranty from Owens Corning. Our install workmanship warranty covers adhesion, fastener attachment, and seam sealing for 10 years and transfers to subsequent owners. The closed-cell spray foam at the rim joist carries a separate 25-year warranty.
What the Warranty Covers
- Foam board adhesion to foundation walls
- Fastener attachment and mechanical hold
- Seam and edge sealing
- Rim joist spray foam thermal performance
- Manufacturer’s 25-year R-value warranty
What the Warranty Does Not Cover
We’re honest about exclusions because hidden exclusions are how most “lifetime warranty” claims fall apart at the worst moment. The warranty does not cover:
- Damage from rodent activity not present at install
- Damage from water entry not present at install
- Subsequent damage from owner-installed wiring, plumbing, or HVAC modifications
How We Quote (Without Quoting on the Phone)
Every Greenville-area crawlspace is different, which is why we never quote sight-unseen over the phone. The 30-minute on-site inspection is what lets us write a quote that’s actually accurate — and that holds for the full 30-day quote window without “discoveries” tacked on later. The inspection itself is free and there’s no obligation; you can use our written quote to comparison-shop other contractors if you want. We’re confident enough in our work that we don’t need to lock you in at the kitchen table.
The quote you receive includes: itemized materials (brand names specified), labor breakdown by day, dehumidifier model and capacity, drainage approach if applicable, full warranty terms, and total price. No “platinum tier” upsells, no contracts that expire by midnight, no penalty clauses if you decide to wait. If you compare our quote line-by-line against a national franchise quote and ours doesn’t make sense, we’ll explain it; we have nothing to hide.
After the Install
Six months after install we come back to verify the insulation has held position and check for any seam separation from seasonal expansion/contraction. We also check the rim joist seal at this time since that’s the area most likely to settle. This visit is included in the original quote. After that, the install is essentially maintenance-free — the foam doesn’t degrade, doesn’t compress, and doesn’t absorb moisture.
Throughout the warranty period, if anything looks off — a seam you can see, a sound from the dehumidifier you don’t recognize, a humidity reading that’s higher than expected — call us. There’s no inspection charge for warranty-covered concerns, and we’d rather come out for a non-issue than have a real issue go unaddressed.
Free Crawl Space Insulation Estimate
Same-week appointments. No high-pressure sales. Serving Greenville and surrounding areas including Greer, Mauldin, Simpsonville, Taylors, Easley, Travelers Rest, Berea, Wade Hampton.
What You Get in Our Quote vs. the Lowball Bid
We don’t compete on the lowest sticker price — we compete on the quote that gets the job actually done. Here is what is included in every quote we write, and the cut-corners that show up in cheaper bids.
Included in our written quote
- Full visual + moisture-meter inspection
- Drainage + sump assessment if applicable
- Written, itemized quote with materials specs
- Photos of every problem area
- Permit-pulling where required
- Final walk-through + signed warranty
Cut corners in the lowball bid
- Cookie-cutter pricing without inspection
- Materials swap-out without telling you
- Subcontracted crews you've never met
- Hidden warranty exclusions
- Pressure to sign same-day
- Bait-and-switch quotes