Common Problems with Open-Cell Spray Foam Insulation

Spray foam insulation was a popular choice for homeowners looking to improve energy efficiency and reduce heating costs. Among the two main types—open-cell and closed-cell spray foam—open-cell is often chosen for its affordability, flexibility, and soundproofing properties.

However, despite its benefits, open-cell spray foam has several potential drawbacks that can lead to moisture issues, structural concerns, and even difficulties with mortgage approvals. If you're dealing with spray foam-related problems or considering removal, this guide will walk you through the key issues and how Countrywide Roofing and Insulation can help.

1. Moisture Retention: A Hidden Danger

Unlike closed-cell spray foam, which has a denser structure and resists moisture, open-cell spray foam is porous. This means it can absorb and trap water if exposed to leaks, condensation, or high humidity.

Why is this a problem?

• Mould and mildew growth – Trapped moisture creates a perfect breeding ground for mould, which can lead to health problems such as respiratory issues and allergies.
• Structural damage – Over time, moisture-laden insulation can cause wooden beams to rot, weakening your home's structure.
• Reduced insulation effectiveness – Wet insulation loses its thermal efficiency, making it harder to keep your home warm in winter and cool in summer.

💡 Did you know? According to the UK Centre for Moisture in Buildings, 1 in 5 homes in the UK struggles with excessive indoor moisture, often due to insulation materials that trap water.

How can we prevent this?

• If moisture issues arise, removal may be necessary to prevent long-term damage. Countrywide Roofing and Insulation provides professional spray foam removal, restoring your home's insulation the right way.

2. Structural Risks: Can Spray Foam Damage Your Roof?

One of the lesser-known issues with open-cell spray foam insulation is the potential strain it can place on your roof. While it expands to fill gaps effectively, improper application can lead to long-term structural damage.

Common problems include:

• Roof tiles and slates lifting – Expanding foam can exert pressure on roofing materials, causing misalignment or even damage over time.
• Blocked ventilation – Proper airflow is crucial in attics and lofts. Spray foam can seal off necessary ventilation, leading to trapped heat and condensation buildup.
• Difficulties with future repairs – Once spray foam is applied, removing or repairing roof components becomes significantly harder without professional assistance.

Think of open-cell spray foam like a sponge. When dry, it's light and airy, but when it absorbs moisture, it becomes heavy and ineffective. Over time, this can weaken your home's structure.

What's the best approach?

If you suspect spray foam-related roof issues, it's crucial to get a professional inspection and removal if necessary. At Countrywide Roofing and Insulation, we safely remove open-cell spray foam, preventing further roof damage and ensuring proper ventilation.

3. Mortgage and Property Sale Issues

Many homeowners are unaware that having spray foam insulation can cause problems with mortgages and property sales. Some lenders are hesitant to approve mortgages on homes with spray foam due to surveying difficulties and concerns over hidden structural damage.

Why do lenders reject homes with spray foam?

• Limited roof inspections – Spray foam can make it difficult for surveyors to assess the condition of timbers, leading to valuation concerns.
• Potential hidden damage – Trapped moisture or poor ventilation can cause gradual but serious structural deterioration.
• Lack of lender confidence – Some banks view spray foam as a risk, making mortgage approvals or refinancing more complicated.

A survey by the Royal Institution of Chartered Surveyors (RICS) found that over 40% of UK mortgage lenders reject homes with spray foam insulation due to concerns about long-term damage.

How can homeowners fix this?

If you're facing mortgage issues, spray foam removal may be the only solution. At Countrywide Roofing and Insulation, we specialise in open-cell spray foam removal, helping homeowners restore their property's value and comply with lender requirements.

4. Air Quality and Health Concerns

Spray foam insulation isn't just about energy efficiency—it can also impact indoor air quality. When improperly installed or degrading over time, spray foam can release chemical fumes, known as off-gassing.

Potential health risks include:

• Respiratory issues – Some homeowners report persistent coughing, irritation, or worsened asthma symptoms.
• Chemical sensitivity – Spray foam contains volatile organic compounds (VOCs), which can cause headaches, dizziness, and allergic reactions.
• Long-term air contamination – Poorly ventilated homes can trap these chemical fumes, affecting indoor air quality for months or even years.

What can be done?

If you suspect spray foam is affecting your air quality, it's important to have your insulation assessed. Our team at Countrywide Roofing and Insulation provides safe spray foam removal, ensuring your home remains a healthy and breathable environment.

5. Spray Foam Removal: Why DIY Isn't the Answer

If you've realised that open-cell spray foam isn't right for your home, you might be tempted to remove it yourself. However, DIY spray foam removal is extremely difficult and can lead to further damage.

Common risks of DIY removal:

• Damaging timber and roofing materials – Spray foam adheres tightly to surfaces, making improper removal a major risk to your home's structure.
• Health hazards – Without protective gear, handling foam dust and chemical residues can be dangerous.
• Incomplete removal – Any foam left behind can continue to cause problems, meaning professional intervention is still needed later.

Why choose experts? 

At Countrywide Roofing and Insulation, we use specialist tools and techniques to ensure a thorough, safe, and effective spray foam removal process. Whether it's open-cell or closed-cell spray foam, our experts will assess your home and provide the best solution.

FAQs: Everything You Need to Know About Spray Foam Removal

1. Can open-cell spray foam cause damp problems?

Yes. Its porous structure absorbs moisture, which can lead to mould growth, timber rot, and reduced insulation effectiveness.

Conclusion: Trust the Experts at Countrywide Roofing and Insulation 

While open-cell spray foam insulation offers benefits, its downsides—moisture retention, structural risks, and mortgage complications—can outweigh its advantages. If you're facing issues with spray foam, professional removal may be the best solution.

 Need expert advice? Contact Countrywide Roofing and Insulation today for a free assessment and professional spray foam removal services.

📞 Call us now or visit our website to schedule an inspection!