Comparing Vapor Barrier Thickness: What You Need to Know
When it comes to crawl space encapsulation, not all vapor barriers are created equal. One of the most critical—and often overlooked—factors is thickness. Choosing the right vapor barrier thickness can impact everything from moisture protection to durability and long-term performance.
In this article, we’ll break down the most common thickness options and help you decide what’s best for your crawl space.
📏 What Does Vapor Barrier Thickness Mean?
Vapor barrier thickness is typically measured in mils, where 1 mil = 0.001 inch.
Common thicknesses include:
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6 mil
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10 mil
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12 mil
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15 mil
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20 mil
Thicker barriers generally offer better puncture resistance, longevity, and protection—especially in high-traffic or high-moisture areas.
⚖️ Thickness Comparison Chart
| Thickness | Best For | Pros | Cons |
|---|---|---|---|
| 6 mil | Temporary fixes, low-traffic areas | Affordable, easy to install | Tears easily, low durability |
| 10 mil | Budget-conscious homeowners | More durable than 6 mil | Limited lifespan in rough environments |
| 12 mil | Standard residential use | Good balance of strength & price | May still puncture under sharp objects |
| 15 mil | Heavy-duty residential | High durability, good protection | Slightly more costly and harder to cut |
| 20 mil | Commercial/residential high-traffic zones | Maximum protection, long lifespan | Higher cost, may require professional install |
✅ Why Thickness Matters
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Durability: Thicker barriers resist tearing during installation and ongoing use.
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Moisture Protection: Heavier mil vapor barriers are less likely to be compromised by ground moisture or pests.
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Insulation Support: Some thicker barriers offer slight thermal benefits when combined with insulation.
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Code Compliance: Certain regions or building codes require minimum thickness (e.g. 10 or 12 mil) for moisture protection.
🛠️ Crawldryer’s Professional Recommendation
We recommend using:
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12 mil for standard residential crawl space encapsulation
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15–20 mil for homes with:
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Frequent crawl space access
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Higher moisture levels
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Uneven or rocky terrain
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Long-term encapsulation goals
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Crawldryer vapor barriers are engineered with premium materials and reinforced layers, providing superior puncture resistance and long-term performance—no matter the thickness.
💡 Final Thoughts
Vapor barrier thickness isn’t just a number—it’s a decision that affects the performance, durability, and value of your crawl space encapsulation project. While thinner materials may cost less upfront, thicker options provide better protection and peace of mind in the long run.
Not sure which thickness is right for your home? Contact Crawldryer’s team—we’re happy to help you choose the perfect solution for your crawl space.
