Spray Foam: What It Is, Why It’s a Problem, and How to Fix It
For years, spray foam insulation was marketed across the UK as a modern, energy-efficient solution. Homeowners were told it would keep their homes warmer, cut energy bills, and even add value to their property. But in 2025, it’s one of the biggest red flags for surveyors and mortgage lenders.
This guide explains what spray foam insulation is, why it has become such a major issue in the UK property market, and what homeowners can do to protect their investment.
What Is Spray Foam Insulation?
Spray foam insulation (polyurethane foam) is applied as a liquid and rapidly expands to form a thick insulating layer. It’s most commonly used in lofts and roof spaces to reduce heat loss and air leakage.
- Open-cell spray foam – Soft and flexible, allows some air movement but absorbs moisture easily.
- Closed-cell spray foam – Dense and rigid, creating a tight seal that can trap moisture and restrict airflow.
When it first appeared, spray foam seemed like a quick fix for draughts and heat loss. Unfortunately, its installation method has caused widespread structural and financial problems for UK homeowners.
The Pros of Spray Foam Insulation
- ✅ Reduces draughts and heat loss.
- ✅ Fits into awkward spaces better than rolls or boards.
- ✅ Quick installation process.
While these benefits sound appealing, the long-term downsides now outweigh them completely.
The Cons of Spray Foam Insulation
- ❌ Mortgage and remortgage issues – Most UK lenders reject homes with spray foam due to the risk of hidden damp or timber damage.
- ❌ Equity release refusals – Equity release providers won’t approve applications until the foam is professionally removed.
- ❌ Harder to sell – Buyers often pull out once surveyors flag spray foam during inspections.
- ❌ Hidden damage – Trapped moisture behind foam can cause roof rot and structural decay.
Why Spray Foam Has Become a Major Problem in the UK
Since March 2024, the Royal Institution of Chartered Surveyors (RICS) has taken a firm stance: any property with spray foam insulation automatically fails a roof inspection. As a result:
- RICS surveyors list spray foam as a defect on reports.
- Mortgage lenders refuse loans until the foam is removed.
- Buyers are advised to avoid spray-foamed properties entirely.
This means what was once sold as an upgrade is now blocking sales, remortgages, and equity release applications across the UK.
What Homeowners Can Do
The only permanent solution is to have spray foam professionally removed and your roof returned to a breathable, inspectable condition. Proper removal restores your home’s mortgageability and allows surveyors to confirm that your roof structure is safe and sound.
At Carbon Zero Solutions Ltd, we specialise in safe, compliant spray foam removal and replacement insulation. We ensure your property meets RICS standards and is ready for sale, remortgage, or equity release.
Next Steps
If your home has spray foam insulation and you’re planning to sell or remortgage, don’t wait for your survey to fail. Acting early can save you time, stress, and thousands in lost value.
👉 Book Your Free Spray Foam Consultation
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