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Specialising in loft and wall insulation plus spray foam remediation, Insulation Group UK serves South England, the Midlands and the North. With SuperFOIL, Knauf and complementary services, it tackles cold homes, damp and lender concerns through professional surveys, breathable solutions and thorough aftercare support.

Phone

07751 709007

Email

info@howdypixel.com

Address

Suite 135, 20 Winchcombe Street
Cheltenham, Gloucester GL52 2LY

Knauf Loft Insulation – Loft Roll 44 & More

Knauf Loft Roll 44 and related products are glass mineral wool rolls designed for insulating cold pitched roofs at ceiling level, with typical thermal conductivity values around 0.044 W/mK. They are non‑combustible with the best Euroclass A1 fire rating and are manufactured using ECOSE® Technology, a plant‑based binder that improves handling and reduces itch compared with many older mineral wools. Installed to the recommended depth, they significantly cut heat loss through the roof and reduce heating demand in winter.

Knauf DriTherm® Cavity Wall Insulation

Knauf DriTherm® cavity slabs, such as DriTherm 32 and 37, are water‑repellent glass mineral wool slabs designed for full‑fill masonry cavity walls, with thermal conductivities as low as 0.032–0.037 W/mK. They are BBA‑certified, A1 non‑combustible and suitable for use in all UK exposure zones, including coastal areas, making them a robust option for cavity wall insulation in new builds and retrofits where appropriate.

Benefits for UK Homeowners

Properly installed loft and cavity wall insulation can reduce annual heating bills by hundreds of pounds and often pays back in just a few years through lower energy use. Knauf mineral wool products combine energy savings with fire safety, moisture resistance and sustainability credentials, making them a strong choice for improving EPC ratings and long‑term comfort.

Why Knauf Loft & Cavity Wall Insulation Is a Trusted Choice

Knauf’s mineral wool products bring together performance, safety and environmental considerations that matter for modern UK homes.

Energy efficiency

Loft and cavity wall insulation with Knauf mineral wool helps reduce heat loss through the roof and walls, directly lowering space‑heating demand and bills.

Fire performance

Many Knauf mineral wool products, including Loft Roll 44 and DriTherm cavity slabs, achieve Euroclass A1 non‑combustible status, supporting fire safety requirements.

Moisture resistance

DriTherm cavity slabs are water‑repellent and non‑hygroscopic, helping them resist moisture ingress while maintaining their thermal performance.

Sustainability & indoor air quality

ECOSE® Technology uses a bio‑based binder with low VOC emissions and no added formaldehyde, with products tested and certified for indoor air comfort.

Using Knauf in Lofts, Walls and Beyond

Knauf mineral wool can be integrated into different parts of the building fabric:

  • Loft floors: Loft Roll 44 installed between and over joists in cold lofts at ceiling level, often combined with raised loft boarding & loft ladders so insulation depth is not compressed.
  • Cavity walls: DriTherm cavity slabs for full‑fill masonry cavity walls, helping to reduce up to a third of the heat that would otherwise be lost through uninsulated walls.
  • Complementary layers: In some projects, Knauf mineral wool provides the bulk insulation layer while SuperFOIL loft insulation adds a continuous reflective layer to reduce thermal bridging and radiant losses.

Insulation Group UK will confirm where Knauf products fit best in your particular property based on age, wall type, loft structure and existing insulation.

 Find the Right Knauf Solution

Re‑Insulating with Knauf After Spray Foam Removal

Many properties that have had spray foam removed from the loft need a reliable, lender‑friendly insulation system to replace it. Knauf mineral wool is often a core part of that solution.

  • Breathable build‑ups: After foam is removed and timbers checked, Knauf Loft Roll can be installed at ceiling level in a ventilated cold loft, maintaining airflow around the roof coverings.
  • Combining with SuperFOIL: In some cases, Knauf between joists is combined with SuperFOIL loft insulation to upgrade performance while keeping the structure inspectable and in line with modern guidance.
  • Supporting survey & lender expectations: Mineral wool systems that maintain ventilation and visibility of timbers are typically easier for surveyors and lenders to assess than spray foam, especially when backed by clear documentation of the removal and re‑insulation process.

Insulation Group UK routinely combines foam insulation removal, timber restoration & repairs and Knauf re‑insulation in one coordinated project.

 Plan My Post‑Foam Insulation

Knauf Loft & Cavity Wall Insulation – Frequently Asked Questions

Answers to typical questions about Knauf mineral wool products and how they fit into a wider insulation strategy.

How much can loft and cavity wall insulation with Knauf actually save me?

UK guidance indicates that uninsulated or poorly insulated walls and roofs can account for more than half of a home’s heat loss, and that adding cavity wall and loft insulation can save many households between roughly £150 and £500+ per year on heating, depending on property type and energy prices. For many homes, that means insulation typically pays for itself within about 2–5 years.

Is Knauf mineral wool safe for fire performance and indoor air quality?

Knauf mineral wool products used for loft and cavity wall insulation, such as Loft Roll 44 and DriTherm slabs, are non‑combustible with Euroclass A1 fire ratings, the highest classification for reaction to fire. ECOSE® Technology also means no added formaldehyde and low VOC emissions, with products tested and certified for high indoor air quality standards.

Will Knauf insulation cause damp or condensation problems in my walls or loft?

When designed and installed correctly with appropriate ventilation and vapour control, Knauf mineral wool is not a cause of damp or condensation; in fact, DriTherm cavity slabs are specifically water‑repellent and non‑hygroscopic. Issues usually arise from missing ventilation paths, unmanaged moisture sources or incorrect detailing, which is why a survey and proper design are essential.

Can Knauf insulation be combined with SuperFOIL and other measures?

Yes. A common approach is to use Knauf mineral wool for bulk insulation between joists or in cavities, and SuperFOIL loft insulation as a continuous reflective layer to reduce thermal bridging and radiant heat loss. This combination is often paired with loft boarding and hydrophobic coatings for a more complete upgrade.

Is Knauf insulation suitable after spray foam has been removed?

Knauf mineral wool is widely used as a replacement insulation after spray foam removal because it supports breathable, ventilated roof build‑ups and allows future inspection of timbers. Insulation Group UK can design a Knauf‑based solution that meets lender and surveyor expectations once foam has been professionally removed.

How do I get a quote for Knauf loft or cavity wall insulation?

To obtain a tailored quote, complete the Get a Free Quote form with your property details and any specific concerns (such as spray foam, cold rooms or high bills), or call 07751 709007. A survey can then be arranged to confirm suitability, specification and pricing.

Ready to Upgrade with Knauf Loft & Cavity Wall Insulation?

Whether you are insulating a cold loft for the first time, upgrading thin or ageing insulation, or re‑insulating after spray foam removal, Knauf mineral wool offers a proven, lender‑friendly way to cut heat loss and improve comfort.

Insulation Group UK designs and installs Knauf loft and cavity wall systems as part of complete packages across South England, the Midlands and the North of England.

 Get Your Knauf Insulation Quote