URL: https://koalainsulation.com/midsouth
Phone Number: (901) 613-1421
Spray foam insulation is widely praised for its energy efficiency and air-sealing capabilities. Homeowners across the Midsouth region often ask one key question before committing to this insulation upgrade: Is spray foam insulation waterproof?
At Koala Insulation of the Midsouth, we’ve heard this concern from countless property owners aiming to protect their homes from moisture damage, mold, and energy loss. In this blog, we’ll break down what “waterproof” really means in the context of insulation, how different types of spray foam handle moisture, and whether spray foam is the right solution for your home’s climate and moisture exposure.
Understanding Spray Foam Insulation
Spray foam insulation comes in two main types: open-cell and closed-cell. Each offers distinct characteristics that affect how the foam interacts with water.
- Open-cell spray foam is lighter and less dense. It has a sponge-like texture and allows some air and moisture permeability.
- Closed-cell spray foam is much denser and forms a rigid barrier that is resistant to both air and water infiltration.
At Koala Insulation of the Midsouth, we evaluate which type is best suited for your needs depending on your home’s structure, usage areas, and the level of moisture exposure in those zones.
Is Spray Foam Insulation Waterproof?
The short answer: closed-cell spray foam insulation is water-resistant, not technically waterproof—but it’s very close.
Here’s a breakdown:
✅ Closed-Cell Spray Foam: Highly Water-Resistant
Closed-cell spray foam is your best defense against moisture. Thanks to its dense structure, it repels water and does not absorb it, making it suitable for areas prone to humidity, minor flooding, or condensation—like crawl spaces, basements, rim joists, and exterior walls.
When professionally installed by the experts at Koala Insulation of the Midsouth, closed-cell spray foam forms a seamless, airtight, and moisture-resistant barrier that helps protect against mold, mildew, and water intrusion.
⚠️ Open-Cell Spray Foam: Vapor Permeable
While open-cell spray foam offers excellent air sealing and soundproofing benefits, it’s not ideal for areas where water is a concern. It absorbs moisture, which can lead to mold growth if the foam gets wet and isn’t properly dried.
That’s why our team always assesses the moisture levels and exposure risk before recommending open-cell foam for any part of your home.
Moisture Control vs. Waterproofing: What’s the Difference?
It’s important to distinguish between waterproof, water-resistant, and vapor-permeable:
- Waterproof materials create an impenetrable barrier against water.
- Water-resistant materials can repel water but may allow some moisture under pressure or prolonged exposure.
- Vapor-permeable materials allow water vapor to pass through, which can help or harm depending on your home’s needs.
Closed-cell spray foam is water-resistant, not waterproof in the sense that it can withstand submersion indefinitely. However, for most residential applications, its performance is more than sufficient to act as a moisture barrier.
Benefits of Water-Resistant Spray Foam Insulation
When you choose closed-cell spray foam from Koala Insulation of the Midsouth, you benefit from more than just moisture resistance:
1. Superior Air Sealing
Closed-cell spray foam expands to fill every gap and crack, eliminating drafts and keeping conditioned air inside your home.
2. Energy Efficiency
Less air leakage means your HVAC system runs more efficiently—cutting your energy bills significantly.
3. Structural Strength
Closed-cell foam adds rigidity to walls and ceilings, offering added durability and resistance to wind and pressure.
4. Mold Prevention
By sealing out moisture, spray foam reduces the risk of mold, mildew, and rot in high-humidity areas.
5. Long-Term Savings
Spray foam typically lasts for decades and reduces repair costs associated with water damage and high energy bills.
Ideal Areas to Use Water-Resistant Spray Foam
In the Midsouth’s variable climate—where hot summers, humidity, and seasonal rainstorms are common—it’s critical to protect your home with smart insulation choices. At Koala Insulation of the Midsouth, we often recommend closed-cell spray foam in the following areas:
- Crawl Spaces: These areas are notorious for trapping moisture. Spray foam creates a dry, insulated environment.
- Basements: Help keep out groundwater and condensation.
- Rim Joists and Band Boards: Vulnerable to drafts and moisture entry.
- Attics: Especially when moisture-laden air can leak in or condensate forms on roof decks.
- Exterior Walls: Protect your home from both air leaks and incidental moisture penetration.
What Happens If Spray Foam Gets Wet?
Closed-cell spray foam typically retains its form and effectiveness even after brief water exposure, but it’s still important to identify and repair any leaks or flooding sources. Unlike fiberglass insulation, which must be removed and replaced when wet, closed-cell spray foam can often be left intact.
Open-cell spray foam, however, must be removed if saturated, as it retains moisture and can promote mold growth. That’s why our team always ensures the right foam is used in the right location.
Why Professional Installation Matters
Spray foam insulation is not a DIY-friendly material. Correct application requires expert handling, precise mixing, and professional safety equipment. Improper installation can result in gaps, inconsistent coverage, or even off-gassing issues.
At Koala Insulation of the Midsouth, we are certified, licensed, and experienced in all spray foam applications. Our team uses industry-best practices and high-quality materials to deliver long-lasting results that protect your home from moisture and energy loss.
Conclusion: Is Spray Foam Right for Your Home?
If you’re seeking an insulation solution that helps seal out moisture while increasing your home’s energy efficiency, closed-cell spray foam is an excellent option. While it may not be “waterproof” in the strictest sense, its water-resistant properties are more than adequate for protecting most residential spaces.
At Koala Insulation of the Midsouth, we take the time to assess your home and recommend the insulation solution that best fits your needs and your budget.
Call us today at (901) 613-1421 or visit https://koalainsulation.com/midsouth to request your free estimate!
Let us help you create a more energy-efficient, moisture-resistant, and comfortable home.