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20mm Thick 34mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
20mm Thick 34mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£5.90£7.08 Ex VATInc VAT Add to cart -
20mm Thick 42mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
20mm Thick 42mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£6.71£8.05 Ex VATInc VAT Add to cart -
25mm Celotex TB4025 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
25mm Celotex TB4025 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£15.53£18.64 Ex VATInc VAT£5.39£6.47 Per M2 Add to cart -
25mm Expanded Polystyrene EPS100 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS100, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£131.16£157.39 Ex VATInc VAT£1.90£2.28 Per M2 Add to cart -
25mm Expanded Polystyrene EPS150 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS150, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£199.81£239.77 Ex VATInc VAT£2.89£3.47 Per M2 Add to cart -
25mm Expanded Polystyrene EPS200 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS200, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£340.52£408.62 Ex VATInc VAT£4.93£5.92 Per M2 Add to cart -
25mm Expanded Polystyrene EPS250 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS250, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£374.89£449.87 Ex VATInc VAT£5.42£6.50 Per M2 Add to cart -
25mm Isover Acoustic Partition Insulation Roll – Glass Mineral Wool 24m2
25mm Isover Acoustic Partition Insulation Roll is a glass mineral wooldesigned to reduce sound transmission between walls and floors, creating quieter and more comfortable spaces.
£42.38£50.86 Ex VATInc VAT£1.77£2.12 Per m2 Add to cart -
25mm Kingspan Kooltherm K103 Insulation Floorboard 2400mm x 1200mm Pack of 12 (34.56m2)
25mm Kooltherm K103 is a premium phenolic core floor insulation solution, designed to deliver exceptional performance with solid concrete or suspended timber floors.
£442.87£531.44 Ex VATInc VAT£12.81£15.37 Per M2 Add to cart -
25mm Kingspan Kooltherm K107 Pitched Roof Board 2400mm x 1200mm Pack of 12 (34.56m2)
25mm Kingspan Kooltherm K107 Pitched Roof Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core. It is used to insulate pitched roofs and attic spaces, and has a thermal conductivity of just 0.019 W/m.K across all thicknesses.
£450.01£540.01 Ex VATInc VAT£13.02£15.62 Per M2 Add to cart -
25mm Kingspan Thermaroof TR26 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)
25mm Kingspan TR26 Thermaroof is high-performance insulation that has a fiber-free rigid thermoset polyisocyanurate (PIR) core. Suitable for flat roof application waterproofed with mechanically fixed single-ply waterproofing.
£382.73£459.28 Ex VATInc VAT£11.07£13.28 Per M2 Add to cart -
25mm Kingspan Thermaroof TR27 PIR Insulation Board 1200mm x 600mm Pack of 12 (8.64m2)
25mm Kingspan Thermaroof TR27 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. It is used to insulate flat roofs waterproofed with fully adhered single-ply, partially bonded built-up felt, mastic asphalt and cold liquid applied waterproofing.
£101.84£122.21 Ex VATInc VAT£11.79£14.15 Per M2 Add to cart -
25mm Knauf Acoustic Insulation Roll – Glass Mineral Wool 26.64m2
25mm Acoustic Insulation Roll from Knauf is a Glass Mineral Wool roll, designed for use in internal wall and floor applications, to offer sound absorption and noise reduction properties.
£44.01£52.81 Ex VATInc VAT£1.65£1.98 Per m2 Add to cart -
25mm ODE Acoustic Roll Insulation 24m2 Roll
25mm ODE Insulation Acoustic Roll is designed to reduce sound transmission, making it an ideal solution for creating quieter indoor environments. Its flexible and simple-to-install design effectively absorbs sound, making it perfect for both residential and commercial spaces.
£36.11£43.33 Ex VATInc VAT£1.50£1.80 Per m2 Add to cart -
25mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
25mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£15.17£18.20 Ex VATInc VAT£5.27£6.32 Per M2 Add to cart -
25mm Rockwool Ductwrap Insulation Wrap 5000mm x 1000mm 10m2
25mm Rockwool Ductwrap 5000mm x 1000mm is a high-performance insulation blanket designed to snugly wrap around ductwork, delivering great thermal protection.
£61.07£73.28 Ex VATInc VAT Add to cart -
25mm Superglass Acoustic Partition Roll Insulation 27.00m2 Roll
25mm Superglass Acoustic Partition Roll (APR) is a lightweight, non-combustible glass mineral wool insulation roll. It is suitable for the following applications: internal walls and floors, timber and metal stud partitions, drylining systems and separating walls and floors. Manufactured at a minimum density of 10kg/m³.
£48.25£57.90 Ex VATInc VAT£1.79£2.15 Per m2 Add to cart -
25mm Thick 108mm Diameter Rockwool Insulated Fire Sleeve 300mm
25mm thick 108mm diameter Rockwool FirePro Insulated Fire Sleeves are constructed from stone wool fibres and graphite intumescent material to safeguard pipework. They are designed to slow the progression of fire while providing enhanced thermal insulation.
£71.60£85.92 Ex VATInc VAT Add to cart -
25mm Thick 108mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 108mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£16.39£19.67 Ex VATInc VAT Add to cart -
25mm Thick 114mm Diameter Rockwool Insulated Fire Sleeve 300mm
25mm thick 114mm diameter Rockwool FirePro Insulated Fire Sleeves are constructed from stone wool fibres and graphite intumescent material to safeguard pipework. They are designed to slow the progression of fire while providing enhanced thermal insulation.
£72.32£86.78 Ex VATInc VAT Add to cart -
25mm Thick 114mm Pipe Diameter Kingspan Kooltherm Pipe Lagging 1000mm
25mm Thick 114mm Pipe Diameter Insulation is an efficient, fiber-free solution that wraps pipes in a sleek layer of high-performance thermal protection, redefining energy-saving insulation.
£24.08£28.90 Ex VATInc VAT Add to cart -
25mm Thick 114mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 114mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£17.14£20.57 Ex VATInc VAT Add to cart -
25mm Thick 127mm Diameter Rockwool Insulated Fire Sleeve 300mm
25mm thick 127mm diameter Rockwool FirePro Insulated Fire Sleeves are constructed from stone wool fibres and graphite intumescent material to safeguard pipework. They are designed to slow the progression of fire while providing enhanced thermal insulation.
£84.24£101.09 Ex VATInc VAT Add to cart -
25mm Thick 127mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 127mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£24.38£29.26 Ex VATInc VAT Add to cart -
25mm Thick 140mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 140mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£19.49£23.39 Ex VATInc VAT Add to cart -
25mm Thick 159mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 159mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£43.86£52.63 Ex VATInc VAT Add to cart -
25mm Thick 15mm Pipe Diameter Kingspan Kooltherm Pipe Lagging 1000mm
25mm Thick 15mm Pipe Diameter Insulation is an efficient, fiber-free solution that wraps pipes in a sleek layer of high-performance thermal protection, redefining energy-saving insulation.
£7.69£9.23 Ex VATInc VAT Add to cart -
25mm Thick 160mm Diameter Rockwool Insulated Fire Sleeve 300mm
25mm thick 160mm diameter Rockwool FirePro Insulated Fire Sleeves are constructed from stone wool fibres and graphite intumescent material to safeguard pipework. They are designed to slow the progression of fire while providing enhanced thermal insulation.
£93.38£112.06 Ex VATInc VAT Add to cart -
25mm Thick 168mm Pipe Diameter Kingspan Kooltherm Pipe Lagging 1000mm
25mm Thick 168mm Pipe Diameter Insulation is an efficient, fiber-free solution that wraps pipes in a sleek layer of high-performance thermal protection, redefining energy-saving insulation.
£37.19£44.63 Ex VATInc VAT Add to cart -
25mm Thick 169mm Diameter Rockwool Insulated Fire Sleeve 300mm
25mm thick 169mm diameter Rockwool FirePro Insulated Fire Sleeves are constructed from stone wool fibres and graphite intumescent material to safeguard pipework. They are designed to slow the progression of fire while providing enhanced thermal insulation.
£95.82£114.98 Ex VATInc VAT Add to cart -
25mm Thick 169mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 169mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£23.29£27.95 Ex VATInc VAT Add to cart -
25mm Thick 17mm Diameter Rockwool Insulated Fire Sleeve 300mm
25mm thick 17 mm diameter Rockwool FirePro Insulated Fire Sleeves are constructed from stone wool fibres and graphite intumescent material to safeguard pipework. They are designed to slow the progression of fire while providing enhanced thermal insulation.
£40.89£49.07 Ex VATInc VAT Add to cart -
25mm Thick 17mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 17mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£5.52£6.62 Ex VATInc VAT Add to cart -
25mm Thick 219mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 129mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£33.15£39.78 Ex VATInc VAT Add to cart -
25mm Thick 21mm Diameter Rockwool Insulated Fire Sleeve 300mm
25mm thick 21mm diameter Rockwool FirePro Insulated Fire Sleeves are constructed from stone wool fibres and graphite intumescent material to safeguard pipework. They are designed to slow the progression of fire while providing enhanced thermal insulation.
£43.17£51.80 Ex VATInc VAT Add to cart -
25mm Thick 21mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging 1000mm
25mm Thick 21mm Pipe Diameter Rockwool Rocklap Aluminium Foil Faced Pipe Lagging (length – 1000mm) is a premium thermal insulation material engineered to improve energy efficiency and minimise heat loss in pipe systems.
£5.72£6.86 Ex VATInc VAT Add to cart
25mm Insulation
25mm insulation is 25mm thick (just under 3cm). It reduces heat transfer and helps to moderate internal surface temperatures. In most cases, this type of thin insulation is specified when space is limited.
What is 25mm thick insulation?
25mm thick insulation is a sheet or layer of insulating material with a depth of 25mm insulation thickness.
Unlike the thicker quilt or roll insulation used in lofts, 25mm insulation is made for tight spaces. It slips neatly into shallow voids or sits on surfaces where thicker products would not fit.
On its own, it is unlikely to meet full heating demand. Its performance depends on its composition.
The key difference between materials lies in how well they conduct heat within that limited depth. Some materials slow heat transfer better than others. By placing insulation in its path – even a thin 25mm layer – you reduce how easily that transfer happens.
What is 25mm insulation thickness used for?
Thin 25mm insulation is useful when:
- You do not have much space to add deep boards, such as on interior stud walls or external wall insulation (EWI) render systems.
- You want to improve thermal performance without rebuilding, for example, before plasterboard or as a “top-up” in retrofit work.
- It is effective at reducing thermal bridging, preventing heat from leaking through frames or junctions.
- You can use it to underpin airtightness in assemblies where larger boards would interfere with finishes. The insulation is part of a sealed layer here.
- In some floors or ceilings, a 25mm insulation layer helps stabilise temperature swings.
It is not usually sufficient on its own to meet current Part L Building Regulations for new builds, but it helps bring assemblies closer when combined with other materials.
Types of 25mm insulation
Common 25mm insulation materials include:
25mm EPS (Expanded Polystyrene)
EPS is a white foam made of tiny beads that are expanded and fused together.
It is light, cost-effective, and easy to cut. EPS gives reasonable thermal performance, though not as good as PIR or phenolic at the same 25mm insulation thickness.
Used in floor screeds or lightweight infill panels where cost matters.
Glass mineral wool
This insulation material is made from spun glass fibres. It is breathable (allows moisture to pass through), soft to cut, and effective at thermal and sound control.
Thin 25mm glass wool sheets are used behind plasterboard or in partition ceilings to provide additional insulation and acoustic performance.
Phenolic foam
Phenolic’s closed-cell structure gives it a higher insulating ability per millimetre compared with many others. A thin 25mm insulation layer of phenolic offers better performance than many thicker, lower-performance materials.
PIR Insulation 25mm (Polyisocyanurate)
PIR boards are rigid foam with foil or laminate facings. They have a higher thermal resistance per millimetre (low λ-value) than EPS or standard mineral wool, making 25mm thin insulation boards useful where space is at a premium.
PIR is common in walls, floors, and ceilings where good thermal control is required with limited depth.
25mm Rock mineral wool
Rock wool works best in thicker layers. So 25mm rock wool insulation is mostly chosen to enhance acoustic or fire performance, not for full thermal insulation.
25mm VIP (Vacuum Insulated Panels)
VIPs have a core sealed in a vacuum pouch, which dramatically reduces heat flow relative to their thickness. A VIP at 25mm insulation thickness can outperform almost any other material the same size.
They are pricier and more delicate to handle, but highly effective where maximum performance in minimal space is required.
Benefits of thin 25mm insulation thickness
Even though it is slim, 25mm thick insulation brings meaningful gains when used right:
Space saver
In tight spaces such as interior stud walls, slim cavity tops, or retrofits, 25mm will not take up much space. You can still install plasterboard or finishes without making the setup bulky.
Ease of installation
Thin sheets are lighter and easier to handle than deep boards. Cutting and fitting them takes less effort.
Improved thermal comfort
Heat moves more slowly through any insulation. A thin 25mm insulation layer makes internal spaces warmer by reducing cold spots on walls and ceilings.
Moisture management
Depending on the material (like breathable glass mineral wool), thin insulation can complement vapour control strategies without trapping moisture when used with appropriate vapour control layers.
Acoustic help
Some 25mm options – especially mineral wool – add noticeable sound damping across partitions and ceilings.
Fire resistance
Mineral wool and phenolic boards offer excellent fire performance even in thinner builds, subject to manufacturer classification.
Fewer fixing issues
Thin boards do not bow or squeeze in narrow cavities. There is less risk of them pushing finishes or creating gaps when correctly specified and installed.
FAQ
Where to buy 25mm thick insulation?
You can buy 25mm thick insulation online from Insulation Wholesale. We offer a wide selection of 25mm PIR, EPS, mineral wool, and other materials at competitive prices. Our friendly customer care team is always ready to provide fast quotes, answer questions, and quickly deliver your order to your chosen UK location.
How to fix 25mm insulation?
Fixing 25mm thin insulation is usually done with:
- Adhesive or mastic for flat surfaces. Spread a suitable bonding adhesive on the rear of the board. Press it tight against the surface, and hold until it grips.
- Mechanical fixings (special washers and plugs) in masonry and studs. Adhesive alone will not anchor panels securely on these surfaces. Use clips and screws with plastic caps on metal and timber frames to keep the boards in place.
Where can you fit 25mm insulation?
You can install 25mm insulation in most places with restricted space:
- On internal walls before plasterboard.
- Behind radiators or cupboards to reduce cold spots.
- Under skirting boards and in the reveal details.
- Above ceilings in a secondary layer.
- In floor screeds with limited depth.
It is also great as a topping-up layer when you have deeper insulation elsewhere.
