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Is It Better To Remove Old Loft Insulation Before Adding New

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Loft Insulation Disposal In The UK: A Comprehensive Guide

When considering whether to remove old loft insulation before adding new, several factors come into play, including the condition of the existing insulation, potential health risks, and overall energy efficiency. Here’s a detailed analysis of the reasons for and against removing old insulation before installing new insulation.

Reasons to Remove Old Loft Insulation

1. Condition of Existing Insulation

  • Damage and Degradation: If the old insulation is damaged, compressed, or has degraded over time, it may no longer provide effective insulation. Removing it ensures that the new insulation performs optimally.
  • Pest Infestation: Insulation that has been infested by pests such as rodents or insects should be removed to eliminate health risks and prevent further infestation.
  • Moisture and Mold: Insulation that has been exposed to moisture can harbor mold and mildew, which can pose health risks. Wet insulation also loses its insulating properties and should be replaced.

2. Health and Safety Concerns

  • Asbestos: Older insulation materials may contain asbestos, which is hazardous. Professional removal is necessary to avoid exposure to asbestos fibers.
  • Contaminants: Insulation contaminated with rodent droppings, urine, or other hazardous substances should be removed to maintain a healthy living environment.

3. Improved Energy Efficiency

  • Thermal Performance: New insulation technologies often provide better thermal performance than older materials. Removing old insulation allows for a complete upgrade to more efficient materials.
  • Air Gaps and Coverage: Installing new insulation over old can leave air gaps and inconsistencies, reducing overall effectiveness. Removing old insulation ensures a uniform and thorough installation.

4. Compliance with Building Regulations

  • Regulatory Requirements: Some building regulations or energy efficiency grants and incentives may require the removal of old insulation before new insulation is installed.

Reasons to Leave Old Loft Insulation

1. Cost Savings

  • Reduced Costs: Leaving old insulation in place can reduce labor and disposal costs associated with removal.
  • Time Efficiency: Installing new insulation over old can be quicker, reducing the overall time of the project.

2. Additional Insulation Layer

  • Enhanced Insulation: In some cases, old insulation may still provide some insulating properties. Adding new insulation on top can enhance overall insulation levels without the need for removal.

Best Practices for Deciding Whether to Remove Old Insulation

1. Conduct a Thorough Assessment

  • Professional Inspection: Hire a professional to inspect the condition of the existing insulation and provide recommendations based on their findings.
  • Identify Issues: Check for signs of damage, pest infestation, moisture, and mold.

2. Consider the Type of New Insulation

  • Compatibility: Ensure the new insulation is compatible with the old. Some types of insulation may not perform well when installed over certain materials.
  • Optimal Performance: Determine whether the new insulation requires a clean, debris-free space for optimal performance.

3. Evaluate Health Risks

  • Asbestos Testing: Test for asbestos if the property is older and may contain hazardous materials.
  • Mold and Contaminants: Consider the potential health impacts of leaving moldy or contaminated insulation in place.

4. Factor in Long-Term Benefits

  • Energy Savings: Assess the long-term energy savings and comfort improvements that may result from a complete replacement versus simply adding to existing insulation.
  • Longevity: New insulation may have a longer lifespan, providing more reliable performance over time.


In most cases, removing old loft insulation before installing new insulation is advisable, especially if the old insulation is damaged, contaminated, or otherwise compromised. This approach ensures optimal performance, addresses health and safety concerns, and aligns with best practices for energy efficiency. However, if the old insulation is still in good condition and compatible with the new materials, it may be feasible to install new insulation on top, potentially saving time and costs. A professional assessment is crucial to make an informed decision tailored to your specific situation.

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
1 month 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
1 month 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.