How Closed-Cell Spray Foam Impacts Indoor Air Quality

When it comes to home insulation, closed-cell spray foam was an effective solutions. It provides exceptional thermal resistance, moisture control, and structural reinforcement. However, many homeowners overlook its potential impact on indoor air quality (IAQ). While closed-cell spray foam has clear benefits, poor installation, ageing foam, or the need for removal can all influence the air you breathe.

At Countrywide Roofing and Insulation, we don't just install spray foam—we also specialise in open-cell and closed-cell spray foam removal, ensuring your property stays safe, breathable, and compliant with UK building regulations.

1. How Closed-Cell Spray Foam Affects Indoor Air Quality

Off-Gassing and Chemical Emissions

Freshly applied spray foam releases volatile organic compounds (VOCs), which can cause headaches, respiratory irritation, and allergic reactions. While these emissions typically subside within a few days, low-quality materials or poor installation can prolong the problem, affecting indoor air for weeks or even months.

According to the UK Health and Safety Executive (HSE), exposure to isocyanates—chemicals used in spray foam—accounts for 17% of work-related asthma cases in the UK.

Restricted Ventilation and Airflow Issues

Closed-cell spray foam is excellent for sealing gaps, but an airtight home without proper ventilation can trap pollutants and excess moisture. This can lead to:

• Condensation and Mould Growth – Particularly in lofts and crawl spaces.
• Accumulation of Indoor Pollutants – Including carbon dioxide, allergens, and residual chemicals.

If your home lacks adequate airflow, spray foam removal or modification may be necessary to restore proper ventilation.

Foam Ageing and Degradation

Over time, closed-cell spray foam can deteriorate, especially in humid or extreme conditions. Degrading foam can release airborne particles, which, when inhaled, may pose respiratory risks.

Research indicates that indoor air pollution can be up to five times worse than outdoor air, primarily due to poor ventilation and trapped contaminants.

2. Signs That Spray Foam Removal May Be Necessary

While closed-cell spray foam is built to last, there are instances where removal is the best option:

✅ Foam Cracking or Deterioration – Old or poorly applied foam can release airborne debris.
✅ Lingering Chemical Smell – Persistent odours suggest off-gassing issues.
✅ Mortgage and Survey Compliance – Some lenders require removal for property financing.
✅ Moisture and Mould Problems – Insulation can sometimes mask underlying dampness.

At Countrywide Roofing and Insulation, we specialise in safe and efficient spray foam removal, ensuring your home meets UK regulations and remains safe to live in.

3. A Simple Analogy: The 'Sealed Bottle' Effect

Imagine your home as a sealed water bottle. While it's great at keeping things inside, it also traps everything—good and bad. Closed-cell spray foam locks in warmth but can also trap pollutants, chemicals, and excess moisture.

Just like stale water in a sealed bottle can develop an unpleasant taste over time, stale indoor air in a poorly ventilated home can become polluted. Without proper airflow, indoor air quality suffers, which is why periodic insulation assessments—and sometimes removal—are essential.

4. FAQs About Closed-Cell Spray Foam and Air Quality

1. What are the hidden risks of spray foam insulation?

Beyond the obvious issues like moisture trapping and ventilation blockage, spray foam can also cause roof stress, felt decay, mortgage denial, and resale delays. Learn more:
👉 The Hidden Risks of Spray Foam Insulation: When and Why to Remove It

Many discover issues only after installation, including condensation, loft access restrictions, and home survey failures. Get a full overview here:
👉 Spray Foam Problem

Costs depend on roof size, foam type, and ease of access, but can range from £2,000 to over £7,000. This guide breaks it down clearly:
👉 The True Cost of Spray Foam Insulation Removal: What Homeowners Need to Know

Be extremely cautious. Some cold callers are linked to unqualified or rogue removal services. Here's how to protect yourself:
👉 Spray Foam Removal Cold Callers: Beware

Removing spray foam from your roof is a delicate task. It involves stripping foam without damaging rafters or tiles, ensuring future surveyor and mortgage approval.
👉 Spray Foam Roof Insulation Removal
👉 Spray Foam Roof Removal: A Comprehensive Guide by Countrywide Roofing and Insulation

Safe alternatives like sheep wool, mineral wool, or multifoil insulation offer excellent performance without the risks. Explore your options here:
👉 Say Goodbye to Spray Foam: Choosing a Safer Insulation Solution

Conclusion: Prioritise Indoor Air Quality with Expert Spray Foam Removal 

While closed-cell spray foam insulation is a fantastic solution for energy efficiency, it's important to recognise its potential impact on indoor air quality. Issues like off-gassing, moisture retention, and ventilation restriction can compromise the health and comfort of your home.

At Countrywide Roofing and Insulation, we offer expert spray foam removal services to ensure your home remains safe, breathable, and compliant with UK regulations. Whether you need removal due to air quality concerns, mortgage requirements, or insulation degradation, our team is here to help.

📞 Get in touch with us today for a free assessment and expert advice!