Crawlspace Encapsulation Process

Previously, we explored crawlspace encapsulation in detail—what it is and the benefits it provides. Today, we'll walk through the crawlspace encapsulation process step by step, so if you ever need your crawlspace encapsulated, you’ll know exactly what to expect.

But first, let's briefly refresh our understanding of what crawlspace encapsulation is and why it's beneficial.

Crawlspace encapsulation involves completely sealing off the crawlspace by covering the foundation walls, floors, and sometimes even the ceiling with a heavy-duty polyethylene barrier. Think of it like the lining of a swimming pool—designed to prevent leaks and moisture intrusion.

Key Benefits of Crawlspace Encapsulation: 

• Improved air quality

• Keeps pests away

• Protects your foundation

• Lowers repair costs

• Extends the lifespan of ductwork and HVAC systems

• Increases energy efficiency and lowers utility bills

• Makes floors last longer

• Creates a more comfortable home

• Boosts property value

Want more details? Check out our previous post on crawlspace encapsulation to learn how each of these benefits works.

Now let’s go step-by-step with the Crawlspace Encapsulation Process:

Crawlspaces serve an important purpose and offer practical benefits. However, many homeowners see them as a nuisance—and understandably so. Moisture buildup, mold, pests, and condensation can all cause issues that affect the entire home.

Encapsulation addresses (and helps prevent) these problems.

1. Inspection & Preparation:

Assess for moisture, mold, and structural issues.

Remove debris, standing water, and any old insulation or vapor barriers.

Repair any plumbing or foundation wall leaks.

2. Addressing Drainage and Water Intrusion:

If standing water is present, install a sump pump to remove it.

Consider additional measures like French drains or perimeter drains if water collects around the crawlspace.

Ensure the soil is properly graded to direct water away from the foundation.

3. Mold Remediation (if needed):

Treat mold with fungicide or antimicrobial spray.

Mold must be fully addressed before sealing the space.

4. Raking the Soil:

Level and flatten the soil surface to prepare for the vapor barrier.

5. Sealing Vents and Openings:

Close and seal all vents, gaps, and cracks to prevent outside air, pests, and moisture from entering.

6. Installing a Vapor Barrier:

Lay a thick plastic barrier (typically 12–20 mil polyethylene) across the floor and up the walls.

Tape and seal all seams to create a continuous moisture barrier.

Secure the barrier to walls and support piers.

7. Insulation (Optional but Recommended):

Insulate foundation walls or rim joists using foam board or spray foam.

Floor insulation may be removed if wall insulation is installed.

8. Installing a Dehumidifier:

Install a crawlspace-rated dehumidifier to keep humidity below 60%.

This helps prevent mold growth and maintains a dry environment.

9. Reinforce Piping:

Protect exposed pipes using steel wool and foam insulation where needed.

10. Final Check & Monitoring:

Verify that all components are sealed and functioning properly.

Install a humidity sensor or a remote monitoring system for ongoing moisture control.

Crawlspace encapsulation is one of the most effective ways to protect your home from moisture-related problems while improving energy efficiency and air quality. Most importantly, it protects your investment by adding long-term value to your property.

While there are DIY guides available, we strongly recommend hiring a professional. This is a job that, if done right, only needs to be done once—so it's worth having it completed by an experienced contractor.

And if your home doesn’t have a crawlspace but a basement, you may face similar moisture issues. In that case, basement encapsulation is also recommended. We’ll be diving into that topic soon—so stay tuned!

If you haven’t already considered crawlspace encapsulation, it’s a smart investment with long-term benefits for both your home and your family.