Fireproof Insulation Acoustic 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.
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.
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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 -
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 -
140mm Superglass 32 Timber & Rafter Roll Insulation 3.19m2 Roll
140mm Superglass 32 Timber & Rafter Roll covers 3.19m2, providing snug and energy-saving insulation between timbers and rafters
£55.82£66.98 Ex VATInc VAT£17.50£21.00 Per m2 Add to cart -
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1-14 15+ £41.62£49.94 £36.21£43.45 
140mm URSA 35 Timber Frame Roll 4.93m2
140mm URSA Timber Frame Roll 35 is a lightweight, non-combustible, glass mineral wool product. It is suitable for use in both timber and metal framed walls.
£41.62£49.94 Ex VATInc VAT£8.44£10.13 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 -
90mm Superglass 32 Timber & Rafter Roll Insulation 4.45m2 Roll
90mm Superglass 32 Timber & Rafter Roll covers 4.45m2, providing snug and energy-saving insulation between timbers and rafters.
£52.65£63.18 Ex VATInc VAT£11.83£14.20 Per m2 Add to cart -
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1-14 15+ £47.43£56.92 £41.26£49.51 90mm URSA 35 Timber Frame Roll 7.54m2
90mm URSA Timber Frame Roll 35 is a lightweight, non-combustible, glass mineral wool product. It is suitable for use in both timber and metal framed walls.
£47.43£56.92 Ex VATInc VAT£6.29£7.55 Per m2 Add to cart -
100mm Knauf Rocksilk RS45 Building Insulation Slab 1200mm x 600mm 3.6m2 Pack
100mm Knauf Insulation Rocksilk RS45 is a Rock Mineral Wool slab, designed for use in multiple thermal and acoustic applications. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.
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100mm Rockwool Rainscreen Duo Slab 1200mm x 600mm 46.08m2 Pallet
100mm Rainscreen Duo Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.
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100mm Rockwool RW4 Acoustic Insulation Slab 1200mm x 600mm 34.56 m2 Pallet
100mm Rockwool RW4 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.
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100mm Rockwool RW5 Acoustic Insulation Slab 1200mm x 600mm 34.56m2 Pallet
100mm Rockwool RW5 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.
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125mm Rockwool Rainscreen Duo Slab 1200mm x 600mm 34.56m2 Pallet
125mm Rainscreen Duo Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.
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140mm Knauf Rocksilk Flexible Insulation Slab 1200mm x 600mm 2.16m2 Pack
140mm Knauf Insulation Rocksilk Flexible Slab is a Rock Mineral Wool slab, designed for use in multiple thermal and acoustic applications as well as the fire protection of a loft conversion floor. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.
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150mm Rockwool Rainscreen Duo Slab 1200mm x 600mm 34.56m2 Pallet
150mm Rainscreen Duo Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.
POA Get a quote -
180mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 25.92m2 Pallet
180mm 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.
POA Get a quote -
180mm Rockwool Rainscreen Duo Slab 1200mm x 600mm 25.92m2 Pallet
180mm Rainscreen Du Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.
POA Get a quote -
25mm Knauf Rocksilk RS45 Building Insulation Slab 1200mm x 600mm 14.4m2 Pack
25mm Knauf Insulation Rocksilk RS45 is a Rock Mineral Wool slab, designed for use in multiple thermal and acoustic applications. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.
POA Get a quote -
25mm Rockwool RW3 Acoustic Insulation Slab 1200mm x 600mm 138.24m2 Pallet
25mm 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.
POA Get a quote -
25mm Rockwool RW5 Acoustic Insulation Slab 1200mm x 600mm 138.24m2 Pallet
25mm Rockwool RW5 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.
POA Get a quote -
25mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 138.24m2 Pallet
25mm 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.
POA Get a quote -
30mm Rockwool RW3 Acoustic Insulation Slab 1200mm x 600mm 129.60m2 Pallet
30mm 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.
POA Get a quote -
30mm Rockwool RW5 Acoustic Insulation Slab 1200mm x 600mm 115.20m2 Pallet
30mm Rockwool RW5 Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs.
POA Get a quote -
30mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 138.24m2 Pallet
30mm 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.
POA Get a quote -
40mm Rockwool RW3 Acoustic Insulation Slab 1200mm x 600mm 86.40m2 Pallet
40mm 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.
POA Get a quote -
40mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 138.24m2 Pallet
40mm 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.
POA Get a quote -
50mm Knauf Rocksilk RS45 Building Insulation Slab 1200mm x 600mm 7.2m2 Pack
50mm Knauf Insulation Rocksilk RS45 is a Rock Mineral Wool slab, designed for use in multiple thermal and acoustic applications. It is non-combustible with the best possible Euroclass A1 reaction to fire classification.
POA Get a quote -
50mm Rockwool Ablative Coated Batt 1200mm x 600mm x 0.72m2
50mm Rockwool Ablative Coated Batt is a mineral wool insulation product, pre-coated on both sides with a high performance ablative coating. Rockwool Ablative Coated Batt application includes multiple substrates including solid walls and floors and flexible walls.
£23.41£28.09 Ex VATInc VAT Add to cart -
50mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 8.64m2 Pack
50mm 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.
POA Get a quote -
50mm Rockwool Rainscreen Duo Slab 1200mm x 600mm 69.12m2 Pallet
50mm Rainscreen Duo Slab is dual-density insulation specifically developed for use within ventilated cladding systems, as well as sealed systems such as curtain walling. Once installed, the robust outer surface of the slabs, in combination with a factory applied water-repelling agent, acts to resist rain ingress during construction.
POA Get a quote
