Spray foam insulation has become a popular choice in UK homes, thanks to its promise of better energy efficiency and long-term performance. But how long does it really last — and is it as low-maintenance as it's claimed to be?

While some manufacturers advertise lifespans of 25 to 80 years, the real-world picture isn't always so simple. At Countrywide Roofing and Insulation, we're often called in to inspect or remove spray foam from homes where it's caused more harm than good — and long before those claims of a "lifetime guarantee" have held up.

In this post, we'll explain the actual lifespan of spray foam insulation, what affects its longevity, and why many UK homeowners are now considering spray foam removal for peace of mind.

How Long Does Spray Foam Last?

In theory, spray foam insulation can last several decades — some installers claim it lasts the lifetime of a property. However, the material's performance over time depends on several key factors:

• The type of spray foam used
• The quality of the installation
• The condition and ventilation of the space
• Exposure to damp or roof leaks
• Compliance with lender and surveyor standards

Just because it's still in place doesn't mean it's performing well — or not hiding issues underneath.

???? Stat: An estimated 40% of spray foam installations experience issues within 10 years, often related to damp and poor ventilation.

Open Cell vs Closed Cell: What's the Difference?

Understanding the type of foam in your home is key to understanding how long it's likely to last — and how risky it may be.
Open Cell Spray Foam:

• Soft and slightly breathable
• Less effective at stopping moisture
• Can absorb water like a sponge
• Easier to remove if needed

 

Closed Cell Spray Foam

 

• Dense and rigid
• Blocks air and moisture completely
• Traps condensation, increasing risk of hidden rot
• Difficult to remove and more likely to be flagged by surveyors

At Countrywide Roofing and Insulation, we provide both open cell spray foam removal and closed cell spray foam removal, using careful techniques that protect your roof during the process.

What Shortens Spray Foam's Lifespan?

Although the foam itself doesn't degrade quickly, the conditions around it often lead to problems much sooner. Common reasons spray foam fails include:
 

• Moisture trapped behind the foam, leading to mould and decay
• Roof leaks that go undetected due to the foam's coverage
• Poor installation — either rushed or applied in damp conditions
• Changes in property regulations or lender policies
• Surveyor red flags, making properties unmortgageable

Spray foam is often pitched as low-maintenance, but once it's installed, it creates a sealed system that makes it difficult to spot early warning signs.

???? Stat: More than 70% of UK mortgage lenders now either restrict or decline lending on homes with spray foam insulation in the loft.

Even if It Lasts — Is It Worth It?

Even if your spray foam remains in place for decades, that doesn't always mean it was the right choice.

Homeowners frequently report difficulty selling or remortgaging due to lender policies. And when issues like condensation or rot are eventually discovered, the cost of putting things right can far outweigh the initial savings on heating bills.

That's why more homeowners are choosing spray foam removal — not because the foam has failed, but because it's created unnecessary risks.

Like Sealing a Suitcase with Wet Clothes Inside

Imagine packing damp clothes into a suitcase, sealing it tightly, and forgetting about it. It might seem clean from the outside, but inside, things are festering. That's exactly what happens when spray foam traps moisture behind it — and it's all hidden from view until the damage is done.

What To Do If You Have Ageing Spray Foam

If you've had spray foam installed several years ago and are noticing issues — or are just unsure whether it's still safe — here's what we recommend:

1. Book a Professional Assessment
We'll inspect the type of foam and check for signs of trapped moisture or hidden damage.

2. Get a Free Removal Quote
We offer transparent pricing and expert guidance on safe spray foam removal, tailored to your home.

3. Restore Proper Insulation
After removal, we can help re-insulate your loft using breathable, mortgage-compliant materials that protect both your home and its value.

FAQs: Spray Foam 

1. What are the top signs that I need closed-cell spray foam removal?

If you notice cracks, damp smells, mortgage refusals, or structural shifts, it could be time to remove the insulation. Discover the 5 most common red flags:
???? Top 5 Signs You Need Closed-Cell Spray Foam Removal

2. Can I still do equity release if my home has spray foam?

In many cases, equity release is blocked or heavily restricted due to spray foam's effect on surveys and valuations. Here's how it impacts your financial options:
???? Understanding Equity Release If You Have Spray Foam

3. How long does spray foam insulation last?

While manufacturers claim lifespans of 20–80 years, real-world issues like poor installation, moisture, or roof damage can cut that down drastically. Find out what to realistically expect:
???? What Is the Lifespan of Spray Foam?

4. When and why do I need spray foam removal?

Removal becomes necessary when spray foam affects mortgages, causes damp issues, or fails a home survey. Learn how to identify the right time to act:
???? When and Why You Need Spray Foam Removal

5. Why are people removing spray foam insulation from their homes?

Homeowners across the UK are removing it due to survey failures, property devaluation, trapped moisture, and restricted home improvement plans. Learn more:
???? Why Are People Removing Spray Foam Insulation?

6. Why is closed-cell spray foam difficult to remove?

Closed-cell foam bonds tightly to surfaces, making it labor-intensive and risky to roof timbers if done improperly. Learn what makes it so tricky:
???? Why Closed-Cell Spray Foam Can Be Difficult to Remove

7. Why is spray foam hazardous?

Spray foam can trap moisture, block ventilation, and release chemical off-gassing if applied incorrectly — leading to health, structural, and financial risks. Learn the dangers:
???? Why Is Spray Foam Hazardous?

8. Why shouldn't you spray foam your roof?

Spraying foam directly onto roof tiles or felt can lead to decay, trapped moisture, and mortgage refusals. Here's why professionals advise against it:
???? Why Shouldn't You Spray Foam Your Roof?

 

Final Thoughts 

While spray foam insulation may last for decades under ideal conditions, real-life experience tells a different story. Whether due to hidden damp, structural risk, or mortgage issues, many homeowners are now choosing to have their spray foam professionally removed — and taking back control of their property.
 

At Countrywide Roofing and Insulation, we offer expert spray foam removal across the UK. Whether it's open cell or closed cell, we'll help you remove the risk and restore your loft the right way.

 

Worried your spray foam is past its best?

Contact Countrywide Roofing and Insulation today for a free assessment and expert removal quote.