Seal It. Insulate It.Done.
Vapor barriers, spray foam insulation, and dehumidifiers that seal out moisture and protect your home from the ground up.
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Is Your Crawlspace Doing This to Your Home?
Up to 50% of the air you breathe on the first floor comes from below. If your crawlspace is wet, moldy, or unsealed, that's what your family is inhaling.
Musty Smell Throughout the House
It's not "just an old house smell." That odor is mold and mildew from your crawlspace rising through the floor and circulating through your entire home.
Unusually High Humidity Indoors
If your home feels clammy even with the AC running, your crawlspace is pumping moisture into the living space. The stack effect pulls that damp air upward all day.
Cold Floors in Winter
Freezing floors above the crawlspace mean zero insulation and open air exchange. You're heating the outdoors through the gap beneath your feet.
Visible Mold in the Crawlspace
If you can see it on the joists, subfloor, or vapor barrier (if there even is one), the mold colony is established. It's releasing spores into your home continuously.
Standing Water or Damp Soil
A wet crawlspace is a mold factory, a wood rot incubator, and a pest magnet. Nothing good happens when there's water under your house.
Sagging or Bouncy Floors
Moisture damage weakens floor joists and subfloor over time. If your floors feel soft or bouncy, the structural wood beneath them may be compromised.
What an Open Crawlspace Does to Your Home
Des Moines' snowmelt, spring rain, and summer humidity keep your crawlspace wet through most of the year. That moisture doesn't stay down there — it rises through your home, rotting structure and breeding mold the entire time.
Mold Spores in Every Room
The stack effect pulls crawlspace air upward through your living space. Mold growing on joists below means mold spores in bedrooms above. Your family is breathing it.
Structural Wood Rot
Floor joists and sill plates sitting in Iowa's humid crawlspace air for years will rot. It starts soft, then it sags, then it fails. This is expensive to repair after the fact.
Poor Air Quality Throughout the Home
Allergies worse at home? Kids coughing? It might not be seasonal — it might be your crawlspace pushing contaminated air through your HVAC system 24/7.
Energy Bills Through the Roof
An unsealed crawlspace is a gaping hole in your home's thermal envelope. Iowa winters are brutal enough without heating the outdoors through the floor.
Pest Infestation
Termites, rodents, and insects love damp, dark, unsealed crawlspaces. Iowa's seasonal pests make an open crawlspace their winter refuge — directly under your home.
Health Risks That Build Over Time
Chronic exposure to mold and poor air quality causes respiratory issues, allergies, headaches, and fatigue. The damage is cumulative and often misdiagnosed.
Four Steps to a Sealed Crawlspace
From "I'm afraid to look down there" to "it's cleaner than my garage" — here's how we do it.
Crawlspace Inspection
We go in, assess moisture levels, check for mold and wood damage, measure humidity, and identify water entry points. You get photos and a full report.
Custom Encapsulation Plan
Based on your crawlspace's size, moisture level, and condition, we design the right combination of vapor barrier, drainage, insulation, and dehumidification.
Complete Encapsulation
Our crew installs the full system — vapor barrier, spray foam, drainage (if needed), and dehumidifier. Most crawlspace projects complete in 2–4 days.
Clean, Dry, Protected
Your crawlspace is sealed, insulated, and climate-controlled. No more mold, no more moisture, no more cold floors. The air quality in your entire home improves.
Complete Crawlspace Encapsulation
for Des Moines Homes
An open crawlspace is an open invitation for Iowa's moisture, mold, and frigid air. We seal it completely — heavy-duty vapor barrier on the floor and walls, drainage if needed, dehumidification, and spray foam insulation. Your crawlspace becomes a clean, dry, conditioned space that protects your home instead of destroying it.
Heavy-Duty Vapor Barrier
20-mil reinforced polyethylene covers the entire crawlspace floor and walls, permanently sealing out ground moisture. No more wet soil, no more humidity rising into your home.
Spray Foam Insulation
Closed-cell spray foam on rim joists and walls creates an airtight thermal barrier. Cold floors vanish. Energy bills drop. Your HVAC system stops working overtime.
Dehumidification Systems
A commercial-grade dehumidifier maintains optimal humidity levels year-round. Mold can't grow, wood stays dry, and the air quality throughout your home improves.
Crawlspace Drainage
If water is actively entering the crawlspace, we install drainage and sump systems before encapsulating. The water is managed, then the space is sealed.
Structural Repairs
Damaged joists, sagging beams, or rotted sill plates — we repair structural damage before encapsulating so your crawlspace starts clean and sound.
Don't Let Cost Stop You From Protecting Your Home
We offer flexible financing options so you can fix the problem now — before it doubles in price. Repair today, pay over time, and save thousands compared to waiting.
Get a Free Estimate + Financing Info →Most homeowners qualify · Low monthly payments · No penalty for early payoff
Des Moines Homeowners Trust JLB for Crawlspace Repair
Actual JLB project in Des Moines "Our floors were freezing in winter and the musty smell never went away. JLB spray foamed the rim joists, installed a vapor barrier, and put in a dehumidifier. The house is warmer, drier, and the smell is completely gone."
Actual JLB project in Des Moines "Found standing water and mold in our crawlspace after the spring thaw. JLB installed drainage, encapsulated the whole space, and sealed it up tight. We've been through another Iowa winter and spring — bone dry."
Actual JLB project in Des Moines "The crawlspace was pulling so much cold air in that our furnace ran nonstop in January. After JLB's spray foam and encapsulation, our heating bill dropped by a third. I couldn't believe the difference."
Every Week You Wait,
The Damage Gets Worse.
Foundation problems never get cheaper to fix. They never stabilize on their own. The clay soil under your Des Moines home doesn't take a break — and neither does the damage it's causing right now.
Get My Free Estimate → (515) 717-8560JLB Basement Waterproofing & Foundation Repair Serves the Entire Des Moines Metro
JLB Basement Waterproofing & Foundation Repair proudly serves every community in the Des Moines metro. We know the soil. We know the homes. We've repaired foundations in every corner.
Stop the Damage. Get Answers Today.
A free estimate takes 45 minutes and tells you exactly what's going on under your house — and exactly what it takes to fix it.