Dallas summers push high humidity into crawl spaces while mild winters keep the ground from fully drying, allowing constant moisture to reach sill plates, floor joists and foundation walls. We install 20-mil reinforced polyethylene liners sealed to the foundation with mastic and termination bars, then tie in a dehumidifier sized for the actual cubic footage. Edge cases such as low-clearance areas under 18 inches or partial dirt floors require custom transitions and extra fasteners so the liner never pulls away during seasonal expansion.
Code notes in Dallas County require proper ventilation or mechanical moisture control when encapsulation replaces passive vents; we always verify existing pier-and-beam spacing and note any active cracks before covering them. Homeowners in Lake Highlands or East Dallas often discover termite tubes or standing water once the space is sealed, so we inspect for these before liner installation. The result is stable humidity below 55 percent that protects both the foundation and indoor air quality.
We serve Uptown Dallas, Bishop Arts District, North Dallas and Deep Ellum with the same attention to access points and sump integration. In older homes near Dealey Plaza or the Dallas Arboretum, we frequently work around irregular stone foundations by using flexible flashing and extra seam tape. Every job includes a final walkthrough so you can see the sealed perimeter and confirm all penetrations are properly booted.
Crawl Space Encapsulation Services We Offer
✓Vapor Barrier Installation
Heavy-duty 20-mil liner sealed to foundation walls and piers prevents ground moisture from reaching wood framing in Dallas crawl spaces.
✓Dehumidifier Integration
Whole-crawl dehumidifiers sized for local humidity loads maintain 50 percent or lower moisture after encapsulation is complete.
✓Sump Pump and Drainage Upgrade
New sump basins and French drains move water away from the foundation before the liner is installed in wet Dallas neighborhoods.
✓Insulation and Rim Joist Sealing
Closed-cell spray foam on rim joists and band boards stops air leakage that carries humidity into the encapsulated space.
✓Pest and Rodent Exclusion
Sealed entry points and mesh barriers keep insects and rodents from entering once the crawl space is closed to outside air.
Crawl Space Encapsulation Cost in Texas
| Service | Typical Range | What Affects It |
|---|---|---|
| Basic Encapsulation | $2,800–$5,200 | Up to 800 sq ft with good access and no standing water |
| Full Encapsulation With Dehumidifier | $4,500–$7,800 | Includes unit sized for Dallas humidity loads |
| Sump And Drainage Add-On | $1,200–$2,400 | Required when water is present under piers |
| Low-Clearance Or Partial Dirt Floor | $800–$1,600 | Extra labor and custom transitions |
Ranges are typical for Texas and confirmed with an exact written quote before any work starts.
How it works
- 1
On-Site Assessment
We measure square footage, check for standing water, inspect piers and note any foundation cracks before quoting encapsulation work.
- 2
Site Preparation
Remove debris, treat visible mold when present, and install temporary drainage if water is actively entering the crawl space.
- 3
Liner And Seal Installation
Roll out reinforced vapor barrier, seal all seams and perimeter with mastic, then boot every pipe and wire penetration.
- 4
Moisture Control Setup
Place and connect dehumidifier or sump system, verify drainage, and test that humidity stays below target levels.
- 5
Final Walkthrough
Review the completed encapsulation with you, explain maintenance steps, and provide documentation for your records.
Pricing
Pricing varies with crawl space size, access difficulty and existing moisture issues; call during business hours for an on-site assessment.