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Insulation By Thickness Non combustible
Insulation thickness is a simple way to choose insulation based on the depth of the space you need to fill. This allows you to select the most appropriate material or product range to deliver the performance you need for that required depth. That makes it easier to match the insulation to structures and cavities without forcing or compressing it.
What is insulation by thickness?
Insulation by thickness means selecting an insulating material that matches a required depth. The required depth typically depends on the size of timber or steel framing members. It is also determined by UK Building Regulations and target U-values, as well as existing construction constraints that cannot be altered.
To work properly, insulation must fit the space for which it is designed. If it is thinner than the void, heat can escape around it. If fibrous insulation is over-compressed, the trapped air structure is reduced, leading to a drop in performance. So thickness matters just as much as the material itself.
This approach applies to all insulation types. Mineral wool slabs, glass wool rolls, blown fibre, phenolic foam, PIR, EPS, XPS, and aerogel products are all installed to set depths, and so they can be used correctly in different parts of a building.
What are the different insulation thicknesses used for?
Insulation comes in these common depths:
- Very thin insulation (2–10mm) – usually used for surface upgrades. This includes acoustic layers, thermal laminates, pipe wraps, and specialist products like aerogel, where space is extremely tight.
- Thin to mid-range insulation (12–50mm) – common for internal wall linings, under screeds, between battens, and in service voids, to reduce surface condensation and cold-spot formation. High‑performance foams do more at these depths than fibrous materials.
- Mid-range insulation (60–100mm) – widely used in stud walls, timber floors, warm roofs, and solid wall upgrades. Mostly offered in mineral wool (glass or stone), PIR, and phenolic foam. All can perform reliably when correctly specified and installed.
- Thicker insulation (120–200mm) – typically for roofs, lofts, deep floor zones, and high‑performance wall systems. These depths are about slowing heat flow over time, not just stopping drafts. Loose‑fill and quilt products work well here because they fully fill irregular spaces.
What thicknesses of insulation are there?
Insulation Wholesale stocks insulation thicknesses from 2mm right up to 200mm. Manufacturing constraints and performance requirements determine the depth ranges for each material.
Typical available ranges include:
- Ultra‑thin specialist layers – These are mostly 2–10mm.
- Standard board and slab depths – including 20, 25, 30, 40, and 50mm.
- Common structural fills – Usually 60, 70, 75, 80, 90, 100mm.
- Deep‑fill options – Commonly 120, 140, 150, 170, 200mm.
This wide range allows insulation by thickness to work across refurbishments, extensions, and new builds without structural redesign.
At Insulation Wholesale, you can purchase Insulation By Thickness at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
FAQ
Where to buy insulation by thickness?
You can buy insulation by thickness from Insulation Wholesale. We stock multiple materials across a full depth range, so you can choose the material that best fits your construction build-up, without compromising. Our team helps match insulation thickness to your application, whether for floors, walls, roofs, or specialist applications. We supply UK stock and support both trade and DIY customers with clear advice and reliable delivery.
What insulation thickness is best?
There is no single “best” insulation thickness. The right choice depends on the space available, the target U‑value, and the material used. A thinner high‑performance foam can outperform a thicker fibrous product, while deeper mineral wool can give better sound control and fire resistance. Choose the thickest insulation that fits without compression while complying with UK Building Regulations.
Can different materials be mixed at the same thickness?
Yes, you may combine materials - as long as they are compatible and correctly detailed. You can combine a rigid board layer with mineral wool of the same depth to improve thermal control and sound absorption, for example. The key is to maintain continuity with no air gaps. Do a full vapour control and condensation risk assessment before combining materials.
Insulation By Thickness Range
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3mm Insulation (2)
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5mm Insulation (6)
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6mm Insulation (3)
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8mm Insulation (1)
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9mm Insulation (3)
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10mm Insulation (2)
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12mm Insulation (5)
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15mm Insulation (7)
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18mm Insulation (1)
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20mm Insulation (24)
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25mm Insulation (86)
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27mm Insulation (2)
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30mm Insulation (29)
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37.5mm Insulation (6)
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40mm Insulation (24)
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42.5mm Insulation (1)
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45mm Insulation (2)
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48mm Insulation (2)
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50mm Insulation (62)
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50.5mm Insulation (1)
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52.5mm Insulation (6)
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57.5mm Insulation (1)
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60mm Insulation (40)
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62.5mm Insulation (7)
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65mm Insulation (1)
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70mm Insulation (19)
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72.5mm Insulation (6)
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75mm Insulation (42)
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80mm Insulation (27)
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82.5mm Insulation (4)
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85mm Insulation (2)
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90mm Insulation (25)
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92.5mm Insulation (2)
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100mm Insulation (63)
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110mm Insulation (11)
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115mm Insulation (4)
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120mm Insulation (22)
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125mm Insulation (11)
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130mm Insulation (16)
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140mm Insulation (23)
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150mm Insulation (36)
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165mm Insulation (2)
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180mm Insulation (2)
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200mm Insulation (6)
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100mm Isover Acoustic Partition Insulation Roll – Glass Mineral Wool 11m2
100mm Isover Acoustic Partition Insulation Roll is a glass mineral wooldesigned to reduce sound transmission between walls and floors, creating quieter and more comfortable spaces.
£51.46£61.75 Ex VATInc VAT£4.68£5.62 Per m2 Add to cart -
100mm Isover CWS 32 Cavity Wall Slab 3.28m2 Pack
100mm Isover CWS 32 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£37.84£45.41 Ex VATInc VAT£11.54£13.85 Per m2 Add to cart -
100mm Isover CWS 36 Cavity Wall Slab 6.55m2 Pack
100mm Isover CWS 36 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£36.99£44.39 Ex VATInc VAT£5.65£6.78 Per m2 Add to cart -
100mm Isover Spacesaver Insulation Loft Roll 14.13m2
100mm Isover Spacesaver Insulation Loft Roll is an efficient and easy-to-install solution for insulating loft spaces, designed to enhance energy efficiency and home comfort.
£32.79£39.35 Ex VATInc VAT£2.32£2.78 Per m2 Add to cart -
100mm Knauf Acoustic Insulation Roll – Glass Mineral Wool 12.36m2
100mm 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.
£54.82£65.78 Ex VATInc VAT£4.44£5.33 Per m2 Add to cart -
100mm ODE Acoustic Roll Insulation 7.8m2 Roll
100mm 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.
£27.71£33.25 Ex VATInc VAT£3.55£4.26 Per m2 Add to cart -
100mm ODE Insulation Loft Roll 10.83m2
100mm ODE Insulation Loft Roll is a highly effective thermal loft solution for improving home energy efficiency. Made from eco-friendly materials, it offers a simple and effective way to improve comfort while lowering energy costs.
£22.84£27.41 Ex VATInc VAT£2.11£2.53 Per m2 Add to cart -
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 Acoustic Roll 12 Insulation 12.12m2 Roll
Acoustic Roll 12 is a lightweight, non-combustible glass mineral wool insulation roll. The product is designed to provide thermal and acoustic insulation for several applications, including internal floors and partitions. Manufactured at a minimum density of 12kg/m3.
£45.98£55.18 Ex VATInc VAT£4.03£4.84 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 Isover CWS 32 Cavity Wall Slab 2.73m2 Pack
125mm Isover CWS 32 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£39.37£47.24 Ex VATInc VAT£14.42£17.30 Per m2 Add to cart -
125mm Isover CWS 36 Cavity Wall Slab 4.37m2 Pack
125mm Isover CWS 36 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£34.43£41.32 Ex VATInc VAT£7.88£9.46 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 -
12mm MagPly Fire Rated Board 2400mm x 1200mm (8′ x 4′) 2.88m2
12mm MagPly Fire Rated Board is a type of high-performance board designed to offer excellent fire resistance and durability in various construction and industrial applications.
This makes it a popular choice in areas where fire protection is essential, such as walls, ceilings, and floors in commercial and industrial buildings.£41.16£49.39 Ex VATInc VAT£14.29£17.15 Per M2 Add to cart -
12mm Y-WALL RCM Cement Building Board 2400mm x 1200mm (8 x 4) 2.88m2
12mm RCM Y-wall is a high-quality flexible calcium silicate based fibre cement building board, perfect for use as a fire rated sheathing board. Offering high levels of dimensional stability, Y-wall is an exceptional board for use in multiple applications.
£48.77£58.52 Ex VATInc VAT£16.93£20.32 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 Isover CWS 32 Cavity Wall Slab 2.18m2 Pack
150mm Isover CWS 32 Cavity Wall Slab offers excellent thermal insulation for cavity walls, effectively reducing heat loss and boosting energy efficiency. Lightweight and easy to install, it delivers reliable, long-lasting performance.
£37.84£45.41 Ex VATInc VAT£17.36£20.83 Per m2 Add to cart -
150mm Isover Spacesaver Insulation Loft Roll 9.34m2
150mm Isover Spacesaver Insulation Loft Roll is an efficient and easy-to-install solution for insulating loft spaces, designed to enhance energy efficiency and home comfort.
£32.28£38.74 Ex VATInc VAT£3.46£4.15 Per m2 Add to cart -
150mm ODE Insulation Loft Roll 7.98m2
150mm ODE Insulation Loft Roll is a highly effective thermal loft solution for improving home energy efficiency. Made from eco-friendly materials, it offers a simple and effective way to improve comfort while lowering energy costs.
£26.78£32.14 Ex VATInc VAT£3.36£4.03 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 -
18mm MagPly Fire Rated Board 2400mm x 1200mm (8′ x 4′) 2.88m2
18mm Magply fired rated board is a technically advanced, multi-functional sheet material, containing Magnesium Oxide formulation as the main component. Magply provides an environmentally friendly and fire-safe alternative to regular plywood, OSB or wood.
£73.10£87.72 Ex VATInc VAT£25.38£30.46 Per M2 Add to cart -
200mm Isover Spacesaver Insulation Loft Roll 6.03m2
200mm Isover Spacesaver Insulation Loft Roll is an efficient and easy-to-install solution for insulating loft spaces, designed to enhance energy efficiency and home comfort.
£30.26£36.31 Ex VATInc VAT£5.02£6.02 Per m2 Add to cart -
200mm ODE Insulation Loft Roll 6.84m2
200mm ODE Insulation Loft Roll is a highly effective thermal loft solution for improving home energy efficiency. Made from eco-friendly materials, it offers a simple and effective way to improve comfort while lowering energy costs.
£27.49£32.99 Ex VATInc VAT 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 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
