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Potential Problems With Spray Foam Loft Insulation

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Spray Foam Loft Insulation Problems: A Comprehensive Guide

Spray foam loft insulation, while offering significant benefits such as excellent thermal performance and air sealing, also presents a number of potential problems that homeowners should be aware of. These issues can impact the structural integrity, health and safety, property value, and overall effectiveness of the insulation.

Here are the key potential problems associated with spray foam loft insulation:

1. Structural Integrity and Moisture Issues

  • Moisture Trapping: Spray foam can create an airtight seal, which, if the roof structure is not properly ventilated, can trap moisture. This trapped moisture can lead to mold growth, rot, and structural damage over time, particularly in wooden roof structures.
  • Timber Decay: Inadequate ventilation combined with moisture trapping can accelerate timber decay, compromising the structural integrity of the roof.
  • Expansion Pressure: During application, the foam expands and can exert pressure on roof timbers. If applied incorrectly, this can lead to warping, splitting, or other damage to the structural elements of the roof.

2. Health and Safety Concerns

  • Chemical Off-Gassing: During and shortly after installation, spray foam can release volatile organic compounds (VOCs) and other chemicals that can be harmful if inhaled. Proper ventilation and protective measures are essential during and after application.
  • Long-Term Exposure: There are concerns about the long-term health effects of exposure to the chemicals in spray foam insulation, particularly if the installation was not done correctly or if the foam begins to degrade.
  • Occupational Hazards: Installers need to use proper personal protective equipment (PPE) to avoid exposure to potentially harmful chemicals during application.

3. Fire Safety Issues

  • Combustibility: Some spray foam products are treated to be fire-resistant, but there are still concerns about their performance in actual fire conditions. The material can release toxic fumes when it burns, posing additional risks to occupants and firefighters.
  • Building Regulations: Incorrectly installed spray foam may not meet local fire safety regulations, potentially leading to legal and insurance issues.

4. Impact on Property Value and Mortgage Approvals

  • Surveyor and Lender Concerns: Many surveyors and mortgage lenders have reservations about spray foam insulation due to the potential for hidden damage and difficulty in assessing the condition of the roof structure. This can lead to problems in obtaining mortgages or remortgaging properties with spray foam insulation.
  • Devaluation: Some properties with spray foam insulation have been devalued because of the perceived risks and potential for future problems.

5. Installation Quality and Longevity

  • Quality Control: The effectiveness and safety of spray foam insulation heavily depend on the quality of installation. Poorly applied spray foam can lead to gaps, uneven coverage, and reduced thermal performance.
  • Professional Installation: Spray foam requires skilled and experienced installers to ensure it is applied correctly. Unqualified or inexperienced installers can cause significant problems.

6. Environmental Impact

  • High Energy Use in Production: The production of spray foam insulation involves significant energy use and the release of greenhouse gases.
  • Disposal Issues: Spray foam is not biodegradable and can contribute to landfill waste. Removing and disposing of spray foam insulation can be problematic and costly.

7. Cost and Remediation

  • Higher Initial Cost: Spray foam insulation is generally more expensive than other types of insulation, such as fiberglass or cellulose. This higher initial cost can be a barrier for many homeowners.
  • Remediation Costs: If spray foam insulation causes problems or if a homeowner needs to sell a property but encounters mortgage issues, the cost of removing the insulation and remediating any damage can be substantial.


While spray foam loft insulation offers several advantages, including high thermal efficiency and excellent air sealing, it also presents numerous potential problems that need to be carefully considered. Issues related to structural integrity, health and safety, fire safety, property value, installation quality, environmental impact, and cost can all pose significant challenges.

Homeowners considering spray foam insulation should seek professional advice, ensure they use qualified installers, and thoroughly evaluate the specific needs and conditions of their property to mitigate these risks. Careful planning and consideration can help maximize the benefits while minimizing the potential downsides of spray foam loft insulation.

Latest 5 star Google customer reviews
Peter Roberts
2 months ago

I highly recommend these guys who recently helped us clear and clean out our loft in Newcastle after we had rodents in. They removed old junk and the old insulation then cleaned up the rodent droppings and hoovered the loft out. They were very friendly, made sure no dust and dirt got into our home and cleaned up after themselves. We are elderly people so we couldn't do this but they did everything in half a day. We tried all over to get someone to do the works for us but these guys were the only ones to come out and give us a qoute. Would use again if we ever have another rodent problem.

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alan young
2 months ago

Great job by these guys.
Emptied all the old insulation out of our loft.
Would highly recommend.

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Jackie Marie Townsend
25 days ago

We used this company a couple of days ago and are really impressed with the overall service provided. The lads were here almost 4 and a half hours completely clearing the loft and cleaning it afterwards. They used coverings on the stairs and landing to keep the carpet clean. Our loft looks like a new loft now and we didn't realise just how big it is with all the rubbish removed. Great set of lads, would highly recommend this company. 👍

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Louise McInnes
25 days ago

Fantastic service by the team of lads that came to remove my old insulation. They also removed old wood that was there at a very reasonable price and made sure there was no mess. Turned up when they said they would, very polite and professional. Would definitely recommend.

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We remove all types of loft insulation

  • Mineral Wool
  • Loose
  • Fibreglass
  • Sheep's Wool
  • Blown-In
  • Vermiculite
  • Cellulose
  • Spray Foam
  • Rodent Infested Insulation
  • Water Damaged
  • Verminous
  • Hazardous
  • Pest Control Loft Cleaning
  • Rodent/Pest/Pigeon Feces

Our post loft insulation removal cleaning services

Keeping your loft clean and organized is crucial for maintaining a healthy and efficient home environment. Our professional loft cleaning services are designed to address all your attic cleaning needs, ensuring a pristine and clutter-free space.

Our experienced team is committed to delivering top-notch service with meticulous attention to detail.

Here's what we offer:

Comprehensive Dust and Debris Removal: We thoroughly clean and remove dust, dirt, and debris, leaving your loft spotless.

Pest Infestation Cleanup: Our team handles pest infestations, removing nests and droppings to ensure a safe and sanitary loft.

Clutter Organization: We help sort and organize stored items, making your loft more functional and accessible.

Sanitization and Disinfection: We sanitize and disinfect surfaces to eliminate germs and allergens, promoting a healthier home.

Trust us to transform your loft into a clean, organized, and healthy space, enhancing the overall comfort and value of your home.