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Insulation By Thickness Thermal TP10/TF70/TW55
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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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 Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 3 (8.64m2)
All three models 100mm Kingspan Therma PIR Insulation Board:
- 100mm Thermapitch TP10
- 100mm Thermafloor TF70
- 100mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£173.05£207.66 Ex VATInc VAT£20.03£24.04 Per M2 Add to cart -
125mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 2 (5.76m2)
All three models 20mm Kingspan Therma PIR Insulation Board:
- 125mm Thermapitch TP10
- 125mm Thermafloor TF70
- 125mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£198.03£237.64 Ex VATInc VAT£34.38£41.26 Per M2 Add to cart -
140mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 2 (5.76m2)
All three models 140mm Kingspan Therma PIR Insulation Board:
- 140mm Thermapitch TP10
- 140mm Thermafloor TF70
- 140mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£173.30£207.96 Ex VATInc VAT£30.09£36.11 Per M2 Add to cart -
150mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 2 (5.76m2)
All three models 150mm Kingspan Therma PIR Insulation Board:
- 150mm Thermapitch TP10
- 150mm Thermafloor TF70
- 150mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£173.54£208.25 Ex VATInc VAT£30.13£36.16 Per M2 Add to cart -
25mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)
All three models 25mm Kingspan Therma PIR Insulation Board:
- 25mm Thermapitch TP10
- 25mm Thermafloor TF70
- 25mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£264.91£317.89 Ex VATInc VAT£7.67£9.20 Per M2 Add to cart -
30mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 10 (28.8m2)
All three models 30mm Kingspan Therma PIR Insulation Board:
- 30mm Thermapitch TP10
- 30mm Thermafloor TF70
- 30mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£269.23£323.08 Ex VATInc VAT£9.35£11.22 Per M2 Add to cart -
40mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 8 (23.04m2)
All three models 40mm Kingspan Therma PIR Insulation Board:
- 40mm Thermapitch TP10
- 40mm Thermafloor TF70
- 40mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
Non-refundable.
£262.88£315.46 Ex VATInc VAT£11.41£13.69 Per M2 Add to cart -
50mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 6 (17.28m2)
All three models 50mm Kingspan Therma PIR Insulation Board:
- 50mm Thermapitch TP10
- 50mm Thermafloor TF70
- 50mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£198.59£238.31 Ex VATInc VAT£11.49£13.79 Per M2 Add to cart -
60mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 5 (14.40m2)
All three models 60mm Kingspan Therma PIR Insulation Board:
- 60mm Thermapitch TP10
- 60mm Thermafloor TF70
- 60mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£205.54£246.65 Ex VATInc VAT£14.27£17.12 Per M2 Add to cart -
70mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
All three models 70mm Kingspan Therma PIR Insulation Board:
- 70mm Thermapitch TP10
- 70mm Thermafloor TF70
- 70mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£178.13£213.76 Ex VATInc VAT£15.46£18.55 Per M2 Add to cart -
75mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
All three models 75mm Kingspan Therma PIR Insulation Board:
- 75mm Thermapitch TP10
- 75mm Thermafloor TF70
- 75mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£186.00£223.20 Ex VATInc VAT£16.15£19.38 Per M2 Add to cart -
80mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
All three models 80mm Kingspan Therma PIR Insulation Board:
- 80mm Thermapitch TP10
- 80mm Thermafloor TF70
- 80mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£214.38£257.26 Ex VATInc VAT£18.61£22.33 Per M2 Add to cart -
20mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 15 (43.20m2)
All three models 20mm Kingspan Therma PIR Insulation Board:
- 20mm Thermapitch TP10
- 20mm Thermafloor TF70
- 20mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
No longer in production.
£319.28£383.14 Ex VATInc VAT£7.39£8.87 Per M2 Get restock alert
