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100mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 4.32m2 Pack
100mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
£42.91£51.49 Ex VATInc VAT£9.93£11.92 Per m2 Add to cart -
100mm Rockwool RW3 Acoustic Insulation Slab 1200mm x 600mm 2.88m2 Pack
100mm Rockwool RW3 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.
£37.01£44.41 Ex VATInc VAT£12.85£15.42 Per m2 Add to cart -
100mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 2.88m2 Pack
100mm Rockwool RWA45 has been developed for thermal, acoustic and fire performance in a range of construction types. It is suitable for applications on partition walls, ceilings, floors and roofs.
£23.41£28.09 Ex VATInc VAT£8.13£9.76 Per m2 Add to cart -
100mm Superglass 44 Multi Loft Roll Insulation 12.12m2 Roll
Multi-Roll 44 is a lightweight, non-combustible glass mineral wool roll, designed to provide thermal insulation in lofts. This roll is typically used for insulating loft spaces and cold roofs but can also be used in a multitude of different applications.
£27.35£32.82 Ex VATInc VAT£2.26£2.71 Per m2 Add to cart -
100mm Superglass Superwall 32 Cavity Wall Slab 3.28m2 Pack
100mm Superglass Superwall 32 is a British Board of Agrément (BBA) approved, non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£36.34£43.61 Ex VATInc VAT£11.08£13.30 Per m2 Add to cart -
100mm Superglass Superwall 36 Cavity Wall Slab 4.37m2 Pack
100mm Superglass Superwall 36 is non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£25.59£30.71 Ex VATInc VAT£5.86£7.03 Per m2 Add to cart -
100mm URSA 32 Cavity Wall Insulation Slab 3.07m2 Pack
100mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£30.52£36.62 Ex VATInc VAT£9.94£11.93 Per m2 Add to cart -
100mm URSA 35 Cavity Wall Insulation Slab 3.69m2 Pack
100mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£21.66£25.99 Ex VATInc VAT£5.87£7.04 Per m2 Add to cart -
125mm Superglass Superwall 32 Cavity Wall Slab 2.18m2 Pack
125mm Superglass Superwall 32 is a British Board of Agrément (BBA) approved, non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£30.37£36.44 Ex VATInc VAT£13.93£16.72 Per m2 Add to cart -
125mm Superglass Superwall 36 Cavity Wall Slab 3.28m2 Pack
125mm Superglass Superwall 36 is non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£26.35£31.62 Ex VATInc VAT£8.03£9.64 Per m2 Add to cart -
125mm URSA 32 Cavity Wall Insulation Slab 2.46m2 Pack
125mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£30.55£36.66 Ex VATInc VAT£12.42£14.90 Per m2 Add to cart -
125mm URSA 35 Cavity Wall Insulation Slab 3.07m2 Pack
125mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£24.33£29.20 Ex VATInc VAT£7.93£9.52 Per m2 Add to cart -
140mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 2.88m2 Pack
140mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
£39.18£47.02 Ex VATInc VAT£13.60£16.32 Per m2 Add to cart -
150mm Superglass 44 Multi Loft Roll Insulation 7.71m2 Roll
Multi-Roll 44 is a lightweight, non-combustible glass mineral wool roll, designed to provide thermal insulation in lofts. This roll is typically used for insulating loft spaces and cold roofs but can also be used in a multitude of different applications.
£26.35£31.62 Ex VATInc VAT£3.42£4.10 Per m2 Add to cart -
150mm Superglass Superwall 32 Cavity Wall Slab 2.18m2 Pack
150mm Superglass Superwall 32 is non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£35.55£42.66 Ex VATInc VAT£16.31£19.57 Per m2 Add to cart -
150mm Superglass Superwall 36 Cavity Wall Slab 3.28m2 Pack
150mm Superglass Superwall 36 is non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£32.05£38.46 Ex VATInc VAT£9.77£11.72 Per m2 Add to cart -
150mm URSA 32 Cavity Wall Insulation Slab 2.46m2
150mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£35.27£42.32 Ex VATInc VAT£14.34£17.21 Per m2 Add to cart -
150mm URSA 35 Cavity Wall Insulation Slab 2.46m2 Pack
150mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£34.00£40.80 Ex VATInc VAT£13.82£16.58 Per m2 Add to cart -
150mm URSA Loft Roll Insulation 8.55m2 Roll
150mm URSA 10 DIVERSO Loft Rolls are used as loft insulation in cold pitched roofs. It is suitable for both new build and refurbishment.
£30.45£36.54 Ex VATInc VAT£3.56£4.27 Per m2 Add to cart -
200mm Superglass 44 Multi Loft Roll Insulation 5.63m2 Roll
Multi-Roll 44 is a lightweight, non-combustible glass mineral wool roll, designed to provide thermal insulation in lofts. This roll is typically used for insulating loft spaces and cold roofs but can also be used in a multitude of different applications.
£28.17£33.80 Ex VATInc VAT£5.00£6.00 Per m2 Add to cart -
200mm URSA Loft Roll Insulation 6.27m2 Roll
200mm URSA 10 DIVERSO Loft Rolls are used as loft insulation in cold pitched roofs. It is suitable for both new build and refurbishment.
£30.63£36.76 Ex VATInc VAT£4.89£5.87 Per m2 Add to cart -
50mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 6.48m2 Pack
50mm Rockwool RWA45 has been developed for thermal, acoustic and fire performance in a range of construction types. It is suitable for applications on partition walls, ceilings, floors and roofs.
£27.94£33.53 Ex VATInc VAT£4.31£5.17 Per m2 Add to cart -
75mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 4.32m2 Pack
75mm Rockwool RWA45 has been developed for thermal, acoustic and fire performance in a range of construction types. It is suitable for applications on partition walls, ceilings, floors and roofs.
£27.24£32.69 Ex VATInc VAT£6.31£7.57 Per m2 Add to cart -
100mm Knauf DriTherm 32 Cavity Wall Insulation Slab 455mm x 1200mm 3.27m2 Pack
100mm DriTherm Cavity Slab 32 is a water-repellent Glass Mineral Wool slab designed for use in external full-fill masonry cavity walls, that offers the best thermal performance in the range. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.
£36.96£44.35 Ex VATInc VAT£11.30£13.56 Per m2 Add to cart -
100mm Knauf DriTherm 37 Cavity Wall Insulation Slab 455mm x 1200mm 6.55m2 Pack
100mm DriTherm Cavity Slab 37 is a water-repellent Glass Mineral Wool slab, designed for use in external full-fill masonry cavity walls, that offers excellent thermal performance. It is non-combustible with the best possible Euroclass A1 reaction to fire classification
£37.66£45.19 Ex VATInc VAT£5.75£6.90 Per m2 Add to cart -
150mm Knauf DriTherm 32 Cavity Wall Insulation Slab 455mm x 1200mm 2.18m2 Pack
150mm DriTherm Cavity Slab 32 is a water-repellent Glass Mineral Wool slab designed for use in external full-fill masonry cavity walls, that offers the best thermal performance in the range. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.
£37.37£44.84 Ex VATInc VAT£17.14£20.57 Per m2 Add to cart
Our specialist stores
Our specialist stores
Fireproof Insulation Thermal
Fireproof insulation provides essential protection against heat and flame spread in residential, commercial, and industrial buildings, helping meet UK fire safety regulations.
As a fire-rated material, it helps protect structural integrity while giving occupants vital extra time if a fire occurs.
What is fireproof insulation?
Fireproof insulation, also known as fire retardant insulation or fire resistant insulation, is built to tolerate high temperatures and limit the rate at which flames spread. It is typically manufactured using non-combustible raw materials such as mineral wool, fibreglass, or specially formulated foams.
Each product is rigorously tested to meet UK and European fire standards. Most achieve a Class A1 or A2 fire rating, meaning they will not ignite, drip, or emit toxic smoke. Thicknesses often range from 25mm to 100mm, with R-values up to 3.0 m²K/W for acoustic and fire resistance.
Applications of fireproof insulation
Fire-resistant insulating material is effective where safety, heat control, and structural protection are essential. It is frequently specified for:
- Internal and external wall systems.
- Ceilings, floors, and roof spaces.
- Around service ducts, pipes, and electrical conduits.
- Fire-rated doors, partitions, and shafts.
- Boiler rooms, plant rooms, and commercial kitchens.
- Steel frames and structural columns.
In modern UK construction, fireproof insulation is often paired with rated boards or fireproof expanding foam to create complete fire-safe systems.
Types of fireproof insulation
We stock a full range of fire rated insulation materials to suit every project:
- Rockwool Fireproof Insulation: Mineral wool slabs and rolls that offer A1 non-combustible protection and impressive acoustic performance.
- Fireproof Insulation Boards: Rigid boards designed for wall linings and fire barriers. Available in various thicknesses.
- Fire Resistant Insulation Boards: For added durability in high-risk spaces such as plant rooms and risers.
Benefits of Fireproof Insulation
Built for performance and compliance, fireproof insulation offers lasting safety and comfort. Here’s why it is a preferred choice among UK builders:
- Meets or exceeds BS EN 13501-1 fire safety standards.
- Slows flame spread and limits heat transmission.
- Maintains structural integrity under high temperatures.
- Reduces smoke and toxic fume release.
- Enhances both fireproof and thermal insulation performance.
- Works alongside standard insulation for better energy efficiency.
- Available in multiple densities, boards, and roll formats for flexible installation in new builds or retrofits.
Why choose our fireproof insulation?
Here’s what makes Insulation Wholesale the trusted choice for fire proof insulation in the UK:
- Premium, tested products from leading brands like Rockwool, Knauf, and Kingspan.
- Certified fire rated boards and slabs.
- Excellent thermal and acoustic values.
- Wide selection of thicknesses and R-values for all build types.
- Competitive trade pricing with volume discounts.
- Expert technical support to help you meet building regulations.
- Fast nationwide delivery.
Get high-performance fireproof insulation at competitive trade prices. Shop our fireproof insulation boards, slabs, and foams online for fast UK delivery.
At Insulation Wholesale, you can purchase Fireproof Insulation at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
FAQ
How to install fireproof insulation?
Installation depends on the type of insulation. Slabs or boards should be cut to fit snugly between joists or studs, fixed with mechanical fasteners or adhesive, and sealed at joints using fireproof expanding foam or fire-rated mastic.
Follow manufacturer guidelines to get the best results, as installation can vary by product type and application. Always verify local fire safety requirements or consult a building inspector.
What is the best fireproof insulation?
Rockwool fireproof insulation is a top performer for most construction applications. The material is non-combustible and easy to handle, and it guarantees thermal and acoustic benefits.
Fireproof insulation boards are also excellent for wall systems and ceilings where rigidity and strength are a necessity.
What is fireproof insulation made of?
Typical materials used to make fire resistant insulation are stone or glass wool, fibreglass, ceramic fibres, and fire retardant foam formulations. Each fireproof insulation board is processed to resist ignition and maintain stability at high temperatures.
How to fireproof foam insulation?
Standard foam insulation is not entirely fireproof, but you can boost its fire resistance in several ways:
- Applying a fireproof coating.
- Enclosing it behind fire resistant panels.
- Applying fire rated expanding foam designed for safety-critical applications.
Always check that products are certified for fire resistance before use.
