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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 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 -
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 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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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.
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 -
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 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 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 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 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 -
60mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 103.68m2 Pallet
60mm 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 -
60mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 92.16m2 Pallet
60mm 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 -
70mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 92.16m2 Pallet
70mm 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 -
75mm Knauf Rocksilk RS45 Building Insulation Slab 1200mm x 600mm 4.32m2 Pack
75mm 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 -
90mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 86.40m2 Pallet
90mm 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
Underfloor Insulation Acoustic
Underfloor insulation is built to fit beneath floorboards or concrete floors to prevent heat loss and reduce draughts.
What is underfloor insulation?
Underfloor insulation is a specialised solution designed to trap heat inside the home. It is made using various materials, including reflective foil, mineral wool and rigid foam boards. The insulation material should be matched to the floor type to ensure maximum effectiveness.
What is underfloor insulation used for?
You can use underfloor insulation boards on different floor systems:
- In new concrete floor builds, position the insulation under the slab. Or lay it on top of the existing slab if installing new flooring.
- Fit the insulation boards between joists in timber floors.
- Position it under laminate and engineered wood flooring. Ensure the insulation is compatible with floating floors to maintain stability.
- Install it beneath tiled and stone floors. Normally installed beneath the screed layer when used with stone or tiled floors.
- Install it under suspended, cellar and basement floors.
Types of insulation for underfloor
Insulation for underfloor use comes in many forms. It includes:
Usually made from mineral or glass wool, these slabs can be cut to fit between joists.
Superfoil Multifoil Insulation
Foil reflective insulation models SF19+, SF40 and SFUF are typically used in suspended timber floors or underfloor heating systems to reflect radiant heat upward.
Rigid underfloor board insulation is ideal for solid floors, such as concrete or stone. It is available in different materials and performance levels. The most common boards for underfloor insulation are:
- PIR insulation: These are lightweight, high-performance panels with remarkable insulation performance. They are perfect for tight spaces.
- EPS insulation/XPS insulation boards: These are durable polystyrene boards suitable for a wide variety of floor systems.
- Specialist boards: Ultra-thin boards like Kingspan Optim-R deliver high insulation performance with minimal thickness. Best for areas with limited floor height.
Benefits of underfloor boards / slabs
Here is why investing in underfloor insulation slabs is a good idea:
- They are an effective way to stop downward heat loss.
- Reduced heat loss means lower heating costs and more savings.
- They minimise underfloor draughts.
- They help reduce noise between floors.
- Most underfloor boards are designed to last, so you won’t need frequent replacements.
Why choose our underfloor insulation?
We only sell quality underfloor insulation boards. That means we are selective about the brands we carry and stock only trusted names with a proven performance record.
Our underfloor boards are engineered to meet or exceed UK Building Regulations for thermal performance.
Get the right underfloor insulation for a warmer, more efficient build. Shop trusted UK brands delivered straight to your site.
FAQ
Can underfloor insulation cause damp?
Only if installed incorrectly. Always pair underfloor insulation with proper damp-proofing and adequate ventilation to prevent moisture buildup. When fitted as recommended, underfloor insulation keeps your floors warm without causing damp issues.
How to install underfloor insulation?
For timber floors, fix the panels tightly between joists. For concrete or solid floors, lay the boards over the surface or under a screed. The insulation should be flush, with no gaps. Include any required damp-proof membranes as specified by Building Regulations.
What is underfloor insulation?
This is an insulation material specially designed for installation under floors. It is effective in reducing draughts and minimising heat loss. The specific underfloor insulation slab to use depends on the type of floor.
Which underfloor insulation is best?
The best underfloor insulation depends on your floor structure and project goals because what works for one floor may not suit another. For example, mineral wool boards work best on timber floors, and rigid insulation boards work great on concrete floors. So always consider the floor type first.
