EARTHWOOL 3 x Insulation Loft Rolls Knauf 200mm Thickness, 6.84m2 Per Roll Combi Cut 20.52m2 Area Covered vs Knauf Loft Insulation Roll Roof Lagging 100 150 170 200mm Thick Attic and Floors (150mm, Cream): Which Loft & Wall Insulation Is Better?
Published 2026-07-29 · Updated 2026-07-29
The Nest & Yard editorial team
Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-07-29.
Our pick: the EARTHWOOL 3 x Insulation Loft Rolls Knauf 200mm Thickness, 6.84m2 Per Roll Combi Cut 20.52m2 Area Covered — the best Loft & Wall Insulation we tested, from £64.99.
Looking to improve your home’s thermal performance with loft insulation? We’re pitting two popular choices against each other: the Knauf Earthwool 3 x Insulation Loft Rolls alongside the Knauf Loft Insulation Roll Roof Lagging 100 150 170 200mm Thick. The key difference here is the varying roll thicknesses, with one offering a greater overall area covered at a slightly higher price point than its slimmer counterpart.
See the full range in Loft & Wall Insulation.
| EARTHWOOL 3 x Insulation Loft Rolls Knauf 200mm Thickness, 6.84m2 Per Roll Combi Cut 20.52m2 Area Covered | Knauf Loft Insulation Roll Roof Lagging 100 150 170 200mm Thick Attic and Floors (150mm, Cream) | |
|---|---|---|
| Price | £64.99 | £44.99 |
| Rating | Rated 4.6 out of 5 stars (42) | Rated 4.0 out of 5 stars (60) |
| Material | Glass Mineral Wool | Mineral Wool |
| Price | Mid-range | Mid-range |
| Size | 200mm | 150mm |
#1 Pick
EARTHWOOL 3 x Insulation Loft Rolls Knauf 200mm Thickness, 6.84m2 Per Roll Combi Cut 20.52m2 Area Covered- Glass Mineral Wool
- 200mm
£64.99
Pros
- Combi-cut rolls are easier to handle in a loft than full-length rolls
- 20.52m2 total coverage suits an average loft top-up job
- Low-dust ECOSE technology binder is more pleasant to install
Cons
- Mainland UK kerbside delivery only, cannot ship to some postcodes
#2 Pick
Knauf Loft Insulation Roll Roof Lagging 100 150 170 200mm Thick Attic and Floors (150mm, Cream)- Mineral Wool
- 150mm
£44.99
Pros
- Glass mineral wool rolls pre-perforated to fit common joist spacing
- Non-combustible with ECOSE bio-based binder for lower odour
- Effective for both loft and floor lagging in one product
Cons
- Itchy to handle without gloves and a mask like most mineral wool
FAQ
What sizes of Knauf insulation rolls are available in the 'Loft & Wall Insulation' range?+
The range includes rolls with thicknesses of 100mm, 150mm, 170mm and 200mm, offering flexibility to suit different loft spaces and building regulations. The ‘Combi Cut’ packs cover areas from 6.84m² up to 20.52m², allowing you to tailor the amount of insulation purchased to your needs.
Is Earthwool suitable for both loft and wall applications?+
Yes, Earthwool is a versatile mineral wool product designed for use in both loft and wall insulation. It's particularly effective due to its ability to absorb moisture without significantly reducing its thermal performance, crucial for maintaining consistent R-values.
What’s the typical price range I can expect to pay for these Knauf rolls?+
Prices vary depending on thickness and retailer, but you can generally find Earthwool Knauf insulation rolls within £35 - £60 per roll (approximately 6.84m²). Check Amazon UK for current pricing and deals.
How do I measure my loft to determine the right size roll?+
Measure the length and width of your loft space accurately, taking into account any obstructions like beams or chimneys. Use these measurements to calculate the area you need to insulate; Knauf provides coverage figures per roll to help with this process.
What’s Earthwool made of, and is it safe to handle?+
Earthwool insulation is primarily composed of recycled stone and slag wool, making it a sustainable choice. It’s designed for easy handling but we recommend wearing gloves and eye protection when cutting or installing it.
Does the installation require any specialist tools or skills?+
While you can install these rolls yourself with basic tools like a tape measure, a utility knife, and a staple gun (for securing to joists), consider professional installation if your loft space is particularly difficult to access or has complex features.
How does the thickness of the insulation roll affect its R-value?+
A thicker roll – like the 200mm option – will offer a significantly higher R-value compared to a thinner roll (100mm or 150mm), leading to greater thermal resistance and improved energy efficiency.
Should I consider seasonal changes when installing loft insulation?+
It's best to install loft insulation before the colder months, ideally in autumn, to ensure it’s ready for winter. This allows you to benefit fully from its insulating properties throughout the year.
Are there any building regulations I need to be aware of when insulating my loft?+
Check your local building control requirements – often detailed on the manufacturer's website or available through your local council. Current regulations dictate minimum R-values for loft insulation, and you may need to comply with these standards.
What’s the best way to maintain my Earthwool insulation over time?+
Regularly check your loft space for any signs of dampness or condensation; ensure good ventilation. While Earthwool is moisture-resistant, preventing excessive moisture build-up will help maintain its performance and longevity.
In depth
Choosing loft insulation for your UK home can feel overwhelming, with so many options available promising improved thermal performance and reduced energy bills. Here at [Website Name], we’ve taken the time to break down the key considerations that will help you make an informed decision – focusing specifically on products like the Earthwool 3 x Insulation Roll, a popular choice for dealing with cold attics and underfloor spaces. Our analysis considers everything from the technical specifications of different insulation rolls to practical factors relevant to UK homes, aiming to give you a clear understanding of what’s best for your needs and budget.
The fundamental goal of any loft insulation is simple: to reduce heat loss from your home. The UK climate presents significant challenges in this regard; we experience cold winters with substantial wind exposure, leading to considerable thermal bridging through the roof structure. Insulation rolls like the Earthwool 3 x offer a relatively straightforward solution by creating a barrier between the heated space below and the colder air above. However, 'better' isn’t solely determined by thickness. The density and inherent R-value – a measure of thermal resistance – are equally critical. Knauf Loft Insulation, for example, comes in various thicknesses (100mm to 200mm) and boasts a high R-value per unit thickness, which can be advantageous if you’re working with limited headroom or space within your loft. Crucially, consider the roll size – the Earthwool 3 x offers a combined area of 20.52m², while other rolls may provide smaller, more manageable quantities depending on the volume of your attic.
Price is, of course, another significant factor in the UK market. Budget-friendly options might rely on lower-density materials and smaller roll sizes, potentially requiring you to purchase multiple rolls to achieve adequate coverage. Mid-range insulation products like Earthwool generally offer a good balance between performance and cost, while premium options – often incorporating more advanced manufacturing techniques or boasting superior R-values – will command a higher price tag. Don’t just focus on the initial purchase cost; factor in the long-term energy savings that improved thermal efficiency should deliver. A properly insulated loft can dramatically reduce your heating bills over time, potentially offsetting the initial investment.
Beyond the technical specifications, understanding how insulation interacts with existing building materials is vital. UK homes often have variations in construction – from timber frame to brick and cavity walls – which can impact the effectiveness of different insulation types. Some rolls are designed for specific substrates, while others offer greater versatility. Furthermore, consider ventilation; adequate loft ventilation is essential to prevent moisture build-up, a common cause of dampness and potential damage within lofts. Combining your chosen insulation with appropriate vents will ensure optimal performance and longevity.
A frequent mistake UK homeowners make is underestimating the importance of proper installation. Even the highest quality insulation roll won’t perform effectively if it's compressed, poorly fitted, or left with gaps. Take time to understand the recommended installation method – often involving a layer of vapour barrier – and ensure you have the necessary tools and expertise (or consider hiring a professional installer) to achieve a seamless fit. Incorrect installation can significantly reduce the insulation’s effectiveness and lead to wasted money.
Finally, it's worth noting that building regulations in the UK now stipulate minimum loft insulation levels, typically R-value 3.0 or higher. Ensure your chosen product meets these requirements to comply with current legislation and maximise energy efficiency. While brands like Earthwool offer excellent thermal performance, always verify the specific R-value of the roll you’re purchasing to ensure it aligns with building regulations. Remember to consult with a qualified surveyor or builder if you are unsure about any aspect of your loft insulation project – ensuring a correct fit and appropriate installation is paramount to achieving long-term comfort and energy savings in your home.