Roof Insulation

  • Flat roof Insulation
  • Pitched roof Insulation

KNAUF, ROCKWOOL, THINSULEX, CELOTEX, XTRATHERM, CELLECTA, KAY-METZELER, LOW-E


Thermal roof insulation is usually installed to improve thermal performance of the house (reduce heating and cooling of space). This in turn reduces energy use to make the house warm. It also reduces carbon dioxide emission to make the house more environmentally friendly and also reduces energy cost. The advantages of installing roof insulation are the increase in living space (converted lofts) and the elimination of condensation on roof surfaces during cold temperatures.

The roof insulation must be installed dry and be kept in this state. When installing board and batt type roof insulation, gaps should not be left as they minimize roof insulation effectiveness. Other factors influencing roof insulation effectiveness include temperature cycling, vibrations, and other similar mechanical forces. The functionality of your roof membrane is also crucial. If you cannot install roof insulation correctly, you will seriously impair its efficiency.

Two types of roof are most commonly found in commercial and residential settings: Flat Roof and Pitched Roof.

Flat Roof

Flat roof can be constructed to create what is called a ‘warm roof’ or a ‘cold roof’ depending on the position of the insulation installed. Inverted roof construction is also used in flat roofs exposed to high temperatures.

Pitched Roof

Depending on the design two types of pitched roof can be found: with a ceiling and without a ceiling. Pitched roofs also use cold and warm specification. These can be further classified into cold breathing, cold ventilated, warm breathing and warm ventilated roofs.

Insulationhsop.co offers a wide range of flat and pitched roof insulation from the manufacturers: Celotex, Xtratherm, Knauf, Kay Metzeler, Cellecta and others. For more information about the particular products please see product description.



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12mm Celotex TB4000 PIR Insulation Board

12mm Celotex TB4000 PIR Insulation Board

1200x2400mm - 2.88m2  show quantity discountsDelivery Time: 2 - 3 days

£10.40 (£12.48 inc VAT)

£3.61/m2 (£4.33/m2 inc VAT)

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Celotex TB4012 is targeted at ‘cut-to-fit’ applications between rafters or joists and enables users to achieve lower U-values with a single layer of insulation than has previously been possible. TB4012 is also appropriate for use in floors and walls. With low emissivity foil facings, TB4012 is manuf..

£10.40 (£12.48 inc VAT)

£3.61/m2 (£4.33/m2 inc VAT)

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50mm Celotex GA4000 PIR Insulation Board

50mm Celotex GA4000 PIR Insulation Board

2400x1200mm - 2.88m2  show quantity discountsDelivery Time: 1 - 2 days

£17.85 (£21.42 inc VAT)

£6.20/m2 (£7.44/m2 inc VAT)

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50mm Celotex GA4050 is a multi-purpose insulation board that provides solution to overcome from the localized thermal bridges problem. Featuring a low emissivity foil facings, this board has been manufactured from tough polyisocyanurate (PIR) by using a perfect mix of certain blowing agent..

£17.85 (£21.42 inc VAT)

£6.20/m2 (£7.44/m2 inc VAT)

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110mm Celotex XR4000 PIR Insulation Board

110mm Celotex XR4000 PIR Insulation Board

2400x1200mm - 2.88m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £37.09 (£44.51 inc VAT)

£12.88/m2 (£15.46/m2 inc VAT)

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Celotex XR4110 is targeted at ‘cut-to-fit’ applications between rafters or joists and enables users to achieve lower U-values with a single layer of insulation than has previously been possible. XR4110 is also appropriate for use in floors and walls. With low emissivity foil facings, XR4110 is manuf..

Guide Price: £37.09 (£44.51 inc VAT)

£12.88/m2 (£15.46/m2 inc VAT)

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90mm Celotex TA4000 PIR Insulation Board (pack of 13)

90mm Celotex TA4000 PIR Insulation Board (pack of 13)

1200x2400 - 37.44m2  show quantity discounts

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90mm Celotex TA4000 PIR Insulation Board (pack of 13) Size: 1200mm x 2400mm Area per pack: 37.44m2 Thermal conductivity: 0.022 W/Mk R-Value: 4.05m2K/W Compressive strength: ≥150kPa Water vapour resistance: >150 MNs/g Weight: 3.09kg/m2   Celotex TA4000 p..

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150mm Rockwool Roll Loft Insulation

150mm Rockwool Roll Loft Insulation

3650x1200mm - 4.38m2  show quantity discountsDelivery Time: 1 - 2 days

£29.69 (£35.63 inc VAT)

£6.78/m2 (£8.14/m2 inc VAT)

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150mm Rockwool Roll Loft Insulation is a multi-functional medium-density insulation roll, especially designed for improving thermal performance in roofs and lofts, and acoustic performance and sound reduction in suspended ceilings. It can be used in number of different applications in commercial, in..

£29.69 (£35.63 inc VAT)

£6.78/m2 (£8.14/m2 inc VAT)

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96mm Celotex TD4000 PIR Flat Roof Insulation Board with Plywood

96mm Celotex TD4000 PIR Flat Roof Insulation Board with Plywood

TD4000 - 2400 x 1200   show quantity discounts

Guide Price: £65.17 (£78.20 inc VAT)

£22.63/m2 (£27.16/m2 inc VAT)

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Celotex TD4000 comprises a polyisocyanurate rigid foam insulation core, with a thermal conductivity of 0.022 W/mK, and low emissivity aluminium foil facings on both sides bonded to a layer of 5.5mm WBP exterior grade plywood. APPLICATION Celotex TD4000 is purpose designed for use in l..

Guide Price: £65.17 (£78.20 inc VAT)

£22.63/m2 (£27.16/m2 inc VAT)

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100mm Kingspan Thermaroof TR24 - (pack of 5)

100mm Kingspan Thermaroof TR24 - (pack of 5)

1200x600mm - 3.60m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £67.14 (£80.57 inc VAT)

£18.65/m2 (£22.38/m2 inc VAT)

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100mm Kingspan Thermaroof TR24 is a rigid insulation board used for flat roof insulation, consisting of a rigid thermoset insulation core, covered with a glass tissue coated with bitumen. Its upper surface is finished with a thermofusible polypropylene fleece, while the lower surface is covered with..

Guide Price: £67.14 (£80.57 inc VAT)

£18.65/m2 (£22.38/m2 inc VAT)

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50mm Celotex EL3000 Flat Roof Board (pack of 10)

50mm Celotex EL3000 Flat Roof Board (pack of 10)

EL3000 1200x600 - 7.20m2  show quantity discounts

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Celotex EL3000 provides a quick and easy method of achieving effective thermal insulation in flat roofing structures. With coated glass tissue facings, EL3000 is manufactured from rigid Polyisocyanurate (PIR) using a blend of blowing agents that have zero ozone depletion potential (zero ODP) and a l..

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50mm Celotex TC3000 Flat Roof Board - Torch on (pack of 10)

50mm Celotex TC3000 Flat Roof Board - Torch on (pack of 10)

1200 x 600 - 7.2m2  show quantity discountsDelivery Time: 3 - 5 days

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50mm Celotex TC3000 Flat Roof Board - Torch on (pack of 10) Size: 1200mm x 600mm Area per pack: 7.2m2 Thermal conductivity: 0.027 W/Mk R-Value: 1.85m2K/W Compressive strength: ≥150kPa Weight: 2.40kg/m2   Celotex TC3000 provides a quick and easy method of achie..

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25mm Celotex FR5000 Fire Resistant PIR Insulation Board (pack of 16)

25mm Celotex FR5000 Fire Resistant PIR Insulation Board (pack of 16)

1200x2400mm - 46.08m2  show quantity discountsDelivery Time: 3 - 5 days

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Celotex FR5025 is one of the available dimensions of the Celotex FR5000 PIR insulation boards made from polyisocyanurate rigid core and faced on both side with low emissivity aluminum foils for improved thermal performance. The product is applicable to different types of constructions incl..

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30mm Thinsulex TLX Silver Multi-foil Insulation

30mm Thinsulex TLX Silver Multi-foil Insulation

1.2m x 10m - 12m2  show quantity discountsDelivery Time: 2 - 3 days

£83.94 (£100.73 inc VAT)

£7.00/m2 (£8.40/m2 inc VAT)

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30mm TLX Silver Multi-foil is an insulation material comprising outer layers of coated metallised film, laminated to a non-woven polypropylene fabric enclosing the core and welded along both long edges. The core of the products consists of five layers of polyester fibre wadding separated by four met..

£83.94 (£100.73 inc VAT)

£7.00/m2 (£8.40/m2 inc VAT)

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30mm Alumaflex Multifoil Insulation

30mm Alumaflex Multifoil Insulation

1.2m x 10m (12m2)  show quantity discountsDelivery Time: 2 - 3 days

£87.00 (£104.40 inc VAT)

£7.25/m2 (£8.70/m2 inc VAT)

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30mm Alumaflex Multifoil insulation is a sophisticated multi layer radiant barrier of low emissivity. This product comprises 14 layers where the outer layer is a PET (polyethylene terephthalate) fused to a PE (polyethylene) bubble layer which is then fused to a non-woven polypropylene backing. The c..

£87.00 (£104.40 inc VAT)

£7.25/m2 (£8.70/m2 inc VAT)

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25mm Earthwool RS45 Universal Insulation Slab Knauf (pack of 20)

25mm Earthwool RS45 Universal Insulation Slab Knauf (pack of 20)

1200x600 - 14.4m2  show quantity discountsDelivery Time: 2 - 3 days

Guide Price: £30.78 (£36.94 inc VAT)

£2.14/m2 (£2.57/m2 inc VAT)

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25mm Earthwool RS45 Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent ad..

Guide Price: £30.78 (£36.94 inc VAT)

£2.14/m2 (£2.57/m2 inc VAT)

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50mm Earthwool RS60 Universal Insulation Slab Knauf (pack of 9)

50mm Earthwool RS60 Universal Insulation Slab Knauf (pack of 9)

1200x600 - 6.48m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £30.78 (£36.94 inc VAT)

£4.75/m2 (£5.70/m2 inc VAT)

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Earthwool RS60 Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent additiv..

Guide Price: £30.78 (£36.94 inc VAT)

£4.75/m2 (£5.70/m2 inc VAT)

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50mm Earthwool RS100 Universal Insulation Slab Knauf (pack of 6)

50mm Earthwool RS100 Universal Insulation Slab Knauf (pack of 6)

1200x600 - 4.32m²  show quantity discountsDelivery Time: 2 - 3 days

Guide Price: £26.19 (£31.43 inc VAT)

£6.06/m2 (£7.27/m2 inc VAT)

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50mm Earthwool Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent additiv..

Guide Price: £26.19 (£31.43 inc VAT)

£6.06/m2 (£7.27/m2 inc VAT)

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50mm Earthwool Flexible Insulation Slab Knauf (pack of 12)

50mm Earthwool Flexible Insulation Slab Knauf (pack of 12)

1200x600 - 8.64m²  show quantity discountsDelivery Time: 2 - 3 days

£35.83 (£43.00 inc VAT)

£4.15/m2 (£4.98/m2 inc VAT)

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50mm Earthwool Flexible is a non-combustible, inorganic rock mineral wool slab, used for thermal and acoustic insulation and specifically designed for installation by friction fitting. Earthwool Flexible is odourless, non-hygroscopic, rot proof, does not sustain vermin and will not encourage th..

£35.83 (£43.00 inc VAT)

£4.15/m2 (£4.98/m2 inc VAT)

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15mm Xtratherm PIR Rigid Insulation Board

15mm Xtratherm PIR Rigid Insulation Board

TThin-R - 2400 x 1200 - 2.88m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £12.50 (£15.00 inc VAT)

£4.34/m2 (£5.21/m2 inc VAT)

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15mm Xtratherm Thin-r is a foil faced Polyisocyanurate (PIR) insulation board formed by a blowing process which generates rigid foam composed of fine cells filled with Pentane blowing agent trapped within the foam. Pentane has very good insulating properties and gives Thin-r superb insulating capabi..

Guide Price: £12.50 (£15.00 inc VAT)

£4.34/m2 (£5.21/m2 inc VAT)

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25mm Yelofoam X2i Cellecta

25mm Yelofoam X2i Cellecta

2500x600mm - 1.5m2  show quantity discountsDelivery Time: 2 - 4 days

Guide Price: £16.72 (£20.06 inc VAT)

£11.15/m2 (£13.38/m2 inc VAT)

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25mm Cellecta Yelofoam is made of extruded polystyrene (XPS) foam blown with a mix of HFA & CO2 gases, containing a yellow pigment, flame retardant additive and nucleating agent. Cellecta insulation products are manufactured to the highest possible specification. Ex All product’s’ physical prope..

Guide Price: £16.72 (£20.06 inc VAT)

£11.15/m2 (£13.38/m2 inc VAT)

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20mm Kingspan Thermapitch TP10 Pitched Warm Roof Insulation Board

20mm Kingspan Thermapitch TP10 Pitched Warm Roof Insulation Board

TP10 1200x2400  show quantity discountsDelivery Time: 1 - 2 days

£13.23 (£15.88 inc VAT)

£4.59/m2 (£5.51/m2 inc VAT)

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20mm Kingspan Thermapitch TP10 is the rafter level insulation comprising of a high performance rigid thermoset insulation core faced on both sides with a low emissivity composite foil facing. The product is manufactured with a blowing agent that has zero Ozone Depletion Potential..

£13.23 (£15.88 inc VAT)

£4.59/m2 (£5.51/m2 inc VAT)

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25mm Kingspan Thermaroof TR26 (pack of 12)

25mm Kingspan Thermaroof TR26 (pack of 12)

2400x1200mm - 34.56m2  show quantity discountsDelivery Time: 3 - 5 days

£214.94 (£257.93 inc VAT)

£6.22/m2 (£7.46/m2 inc VAT)

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25mm Kingspan Thermaroof TR26 is a high performance, fibre free, rigid thermoset PIR insulation core faced on both sides with a low emissivity composite foil facing which is used for insulating flat roofs and is fully compatible with most mechanically fixed single–ply waterproofing systems and ..

£214.94 (£257.93 inc VAT)

£6.22/m2 (£7.46/m2 inc VAT)

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25mm Kingspan Thermaroof TR27 (pack of 12)

25mm Kingspan Thermaroof TR27 (pack of 12)

25mm TR27 - 8.64m2  show quantity discountsDelivery Time: 3 - 5 days

£48.79 (£58.55 inc VAT)

£5.65/m2 (£6.78/m2 inc VAT)

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25mm Kingspan Thermaroof TR27 is a PIR insulation board made from highly effective rigid PIR core faced with coated glass tissue on both sides added during manufacturing. The product offers substantial durability and long life span depending on the condition of the supporting structure. Th..

£48.79 (£58.55 inc VAT)

£5.65/m2 (£6.78/m2 inc VAT)

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56mm Kingspan Thermaroof TR31 PIR bonded to Plywood (pack of 20)

56mm Kingspan Thermaroof TR31 PIR bonded to Plywood (pack of 20)

1200x2400 - 57.60m2  show quantity discountsDelivery Time: 3 - 5 days

£954.74 (£1,145.69 inc VAT)

£16.58/m2 (£19.90/m2 inc VAT)

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56mm Kingspan Thermaroof  TR31 is the flat roof insulation comprising a high performance rigid PIR thermoset insulation core faced with an FSC certified 6 mm nominal thickness WBP exterior grade plywood on its upper surface and a low emissivity composite foil facing on its lower surface. T..

£954.74 (£1,145.69 inc VAT)

£16.58/m2 (£19.90/m2 inc VAT)

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25mm Kooltherm K7 Pitched Roof Board Kingspan (pack of 12)

25mm Kooltherm K7 Pitched Roof Board Kingspan (pack of 12)

K7 2400x1200 - 34.56m2  show quantity discountsDelivery Time: 3 - 5 days

£243.89 (£292.67 inc VAT)

£7.06/m2 (£8.47/m2 inc VAT)

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25mm Kingspan Kooltherm K7 Pitched Roof Board is the rafter/joist level insulation comprising a premium performance rigid thermoset phenolic insulation core faced on both sides with a low emissivity composite foil facing. This reflective, low emissivity surface improves the thermal resista..

£243.89 (£292.67 inc VAT)

£7.06/m2 (£8.47/m2 inc VAT)

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32.5mm Kingspan Kooltherm K18 Insulated Plasterboard - pack of 24

32.5mm Kingspan Kooltherm K18 Insulated Plasterboard - pack of 24

2400x1200mm - 69.12m2  show quantity discountsDelivery Time: 2 - 4 days

Guide Price: £758.63 (£910.36 inc VAT)

£10.98/m2 (£13.18/m2 inc VAT)

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32.5mm Kingspan Kooltherm K18 is a wall dry–lining insulation comprising 12.5mm plasterboard facing bonded to high performance rigid phenolic insulation core. The phenolic core of  Kingspan Kooltherm K18 is manufactured with a blowing agent that has zero Ozone Depletion Potential and low G..

Guide Price: £758.63 (£910.36 inc VAT)

£10.98/m2 (£13.18/m2 inc VAT)

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50mm Flat Roof Insulation Board Xtratherm FR-BGM (pack of 10)

50mm Flat Roof Insulation Board Xtratherm FR-BGM (pack of 10)

1200x600mm - 7.2m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £58.25 (£69.90 inc VAT)

£8.09/m2 (£9.71/m2 inc VAT)

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50mm Xtratherm FR-BGM is a PIR insulation board that is faced with a fleece finished bitumen/glass facers and is suitable for use below partially bonded bitumen based built up roofing systems. FR-BGM can also be used in mechanically fastened or loose laid ballasted bituminous roofing systems.&n..

Guide Price: £58.25 (£69.90 inc VAT)

£8.09/m2 (£9.71/m2 inc VAT)

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50mm Xtratherm Flat Roof Board FR-MG (pack of 10)

50mm Xtratherm Flat Roof Board FR-MG (pack of 10)

1200x600mm - 7.2m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £57.14 (£68.57 inc VAT)

£7.94/m2 (£9.53/m2 inc VAT)

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Xtratherm FR-MG is a mineral coated glass faced board. Xtratherm XT/FR MG boards should be laid over the vapour control layer in a break bonded pattern. The long edges of the boards should be laid at right angles to the direction of the substrate and all edges must be fully supported by the deck. ..

Guide Price: £57.14 (£68.57 inc VAT)

£7.94/m2 (£9.53/m2 inc VAT)

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59mm Plydeck Xtratherm (PIR with OSB Board)

59mm Plydeck Xtratherm (PIR with OSB Board)

2400x1200 - 2.88m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £49.51 (£59.41 inc VAT)

£17.19/m2 (£20.63/m2 inc VAT)

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Xtratherm Plydeck is a composite insulated panel of Xtratherm Polyisocyanurate core with a composite foil face, bonded to 9mm OSB board. The Xtratherm Plydeck provides a high level of thermal insulation and decking in one application.APPLICATION Plydeck is designed to provide high levels of thermal..

Guide Price: £49.51 (£59.41 inc VAT)

£17.19/m2 (£20.63/m2 inc VAT)

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25mm Xtratherm Safe-R Phenolic Insulation Board (pack of 12)

25mm Xtratherm Safe-R Phenolic Insulation Board (pack of 12)

2400x1200 - 34.56m2  show quantity discountsDelivery Time: 2 - 3 days

£267.24 (£320.69 inc VAT)

£7.73/m2 (£9.28/m2 inc VAT)

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25mm Xtratherm Safe-R Phenolic foam is a superior performance rigid insulation with enhanced fire performance, consisting of a Class O phenolic foam core with negligible smoke obscuration. Safe-R is faced with low emissivity aluminium facings both sides, and has a thermal conductivity as low as 0.02..

£267.24 (£320.69 inc VAT)

£7.73/m2 (£9.28/m2 inc VAT)

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30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15

30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15

1200x600mm - 10.8m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £26.69 (£32.03 inc VAT)

£2.47/m2 (£2.96/m2 inc VAT)

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30mm Rockwool RW3 Slab (Prorox SL 930) is a semi-rigid resin bonded slab, providing great thermal, acoustic and fire resistance, designed to be used in various applications in floors, walls and roofs, including special applications in industrial buildings for insulation of  ships, offshore plat..

Guide Price: £26.69 (£32.03 inc VAT)

£2.47/m2 (£2.96/m2 inc VAT)

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50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4

50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4

RW5 50mm - 2.88m2  show quantity discountsDelivery Time: 2 - 3 days

£20.09 (£24.11 inc VAT)

£6.98/m2 (£8.38/m2 inc VAT)

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50mm Rockwool RW5 (Prorox SL960) is a high quality resin bonded Slab for a wide range of thermal, acoustic and fire insulation requirements both within buildings and for industry. They are suitable for many applications including thermal insulation for floors, walls, roofs and boiler rooms. The stru..

£20.09 (£24.11 inc VAT)

£6.98/m2 (£8.38/m2 inc VAT)

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