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
- 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 Lifespan
How long should spray foam insulation last?In perfect conditions, up to 80 years — but in reality, many systems fail or need to be removed within 10–15 years.
Can spray foam go bad over time?
Yes. It can trap moisture, conceal rot, and create mortgage issues, especially if poorly installed or unventilated.
Is closed cell spray foam more durable?
In many cases, yes. Most lenders now require spray foam to be removed before approving a mortgage.
Is removal expensive?
It depends on your loft size and foam type. We offer free surveys and competitive pricing for all removal services.
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.Worried your spray foam is past its best?
Contact Countrywide Roofing and Insulation today for a free assessment and expert removal quote.