Flat Roof Insulation

  • Glass faced PIR boards
  • Mineral wool slabs
  • PIR boards with plywood
  • Warm deck insulation
  • For single ply or built-up

KNAUF, ROCKWOOL, CELOTEX, XTRATHERM, CELLECTA


The type of insulation used in a new flat roof is dependent on the roof specification. On a new concrete slab, with a screed, semi-rigid insulation boards such as expanded polystyrene board, extruded polystyrene board, glass fibre batts, mineral fibre batts, urethane foam board or phenolic foam board are laid under the roof covering. In a new timber structure, glass fibre quilt and mineral fibre quilt can be laid between the joists. In case of an existing flat roof, insulation can be increased externally with extruded polystyrene or foamed glass, or internally with an insulated lining board such as mineral fibre or polyurethane foambacked plaster-board.

Three choices are available for insulating a flat roof depending on the roof specification:
  • Cold roof
  • Warm roof
  • inverted roof

It is essential to understand the difference between those specifications to be able to install insulation in the right place to create a vapour barrier in the right area and prevent rotting of the roof joists.

Warm roof

A warm roof is when the insulation spans across the top of all the joists; it must be continuous and span over every joist. This means that any air rising from underneath would make the void between the joists warm hence a warm roof.

Cold roof

In a cold roof the insulation is put at the bottom of the joists or below the joists. This way sufficient ventilation is maintained which allows air to circulate above the insulation (below the roof). The void above the insulation should be at least 50mm thick. In this case the decking with the roof on it, which is above the joists, would be cold hence a cold roof.

Common mistake in the roof specification is when the insulation is installed inside the joists (close to the top part of the joists). This makes the roof neither cold nor warm, creating the void below the insulation. In this case there is no ventilation which makes the whole roof sweat and causes the joists to rot.

Inverted roof

The inverted roof concept which is also known as protected membrane or upside down roofing. This method ensures insulating both the water proofing membrane and the reinforced concrete slab from extreme thermal stress. This is achieved by placing an extruded polystyrene thermal insulation board above, instead of below the waterproofing membrane and can be used for insulating flat topped buildings or balconies, retail or office developments, flats, hospitals, airports, hotels and residential housing in areas where roof is exposed to high temperatures.

Insulationshop.co offers a wide range of high density flat roof insulation from manufacturers such as Xtratherm, Celotex, Knauf, Kay Metzeler, Cellecta and more. For more information about particular products please see product description.



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59mm Plydeck Xtratherm (PIR with OSB Board) - 50mm PIR + 9mm OSB Board

59mm Plydeck Xtratherm (PIR with OSB Board) - 50mm PIR + 9mm OSB Board

2400x1200 - 2.88m2  show quantity discountsDelivery Time: 1 - 5 working days

Guide Price: £77.01 (£92.41 inc VAT)

£26.74/m2 (£32.09/m2 inc VAT)

show quantity discounts
A10-179
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

Xtratherm Plydeck is a composite insulated panel of 50mm 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.APPLICATIONPlydeck is designed to provide high levels of ther..

Guide Price: £77.01 (£92.41 inc VAT)

£26.74/m2 (£32.09/m2 inc VAT)

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A10-179
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other thicknesses
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: £114.35 (£137.22 inc VAT)

£15.88/m2 (£19.06/m2 inc VAT)

show quantity discounts
A10-186
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

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. Th..

Guide Price: £114.35 (£137.22 inc VAT)

£15.88/m2 (£19.06/m2 inc VAT)

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A10-186
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96mm Recticel Plylok PIR Flat Roof Insulation Board - 90mm PIR + 6mm Plywood Sheet

96mm Recticel Plylok PIR Flat Roof Insulation Board - 90mm PIR + 6mm Plywood Sheet

1200x2400mm - 2.88m2  show quantity discountsDelivery Time: 1 - 5 working days

Guide Price: £131.60 (£157.92 inc VAT)

£45.69/m2 (£54.83/m2 inc VAT)

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A1-1292
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

96mm Recticel Plylok PIR Flat Roof Insulation Board is a rigid PIR board consisted of a few bonded elements contributing to its thermal performance and rigidity. The closed cell rigid 90mm PIR foam core is faced on both sides with multi-layer aluminium foil and bonded to 6mm WBP plywood. It is ..

Guide Price: £131.60 (£157.92 inc VAT)

£45.69/m2 (£54.83/m2 inc VAT)

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A1-1292
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96mm EcoTherm Eco-Deck - Insulated Flat Roof Decking

96mm EcoTherm Eco-Deck - Insulated Flat Roof Decking

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

Guide Price: £114.09 (£136.91 inc VAT)

£39.61/m2 (£47.53/m2 inc VAT)

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A1-2025
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

96mm EcoTherm Eco-Deck is a tough, structural, pre-insulated thermal composite board for flat roofs. It comprises a 90mm thick fibre free polyisocyanurate (PIR) insulation core faced with 6mm thick tough, exterior grade plywood and is ready to fix and finish using basic tools and traditional roofing..

Guide Price: £114.09 (£136.91 inc VAT)

£39.61/m2 (£47.53/m2 inc VAT)

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A1-2025
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other thicknesses
25mm Kingspan Thermaroof TR26 (pack of 12)

25mm Kingspan Thermaroof TR26 (pack of 12)

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

Guide Price: £420.45 (£504.54 inc VAT)

£12.17/m2 (£14.60/m2 inc VAT)

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A10-952
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

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 ..

Guide Price: £420.45 (£504.54 inc VAT)

£12.17/m2 (£14.60/m2 inc VAT)

show quantity discounts
A10-952
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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

Guide Price: £101.65 (£121.98 inc VAT)

£11.77/m2 (£14.12/m2 inc VAT)

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A10-977
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

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..

Guide Price: £101.65 (£121.98 inc VAT)

£11.77/m2 (£14.12/m2 inc VAT)

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A10-977
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Kingspan Aquazone - Water Infiltration Reduction Membrane for Inverted Roofs

Kingspan Aquazone - Water Infiltration Reduction Membrane for Inverted Roofs

3m x 100m - 300m2  Delivery Time: 3 - 5 days

£566.21 (£679.45 inc VAT)

£1.89/m2 (£2.27/m2 inc VAT)

A1-2023

Kingspan Aquazone is a high performance non-woven polyethylene membrane suitable for use on inverted roofs finished with gravel ballast, green roof systems and concrete pavers on appropriate supports. Kingspan Aquazone can can dramatically minimise the cooling effect associated with rainwater f..

£566.21 (£679.45 inc VAT)

£1.89/m2 (£2.27/m2 inc VAT)

A1-2023
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25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)

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

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

Guide Price: £41.63 (£49.96 inc VAT)

£2.89/m2 (£3.47/m2 inc VAT)

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A100-69

25mm Rocksilk RS45 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foi..

Guide Price: £41.63 (£49.96 inc VAT)

£2.89/m2 (£3.47/m2 inc VAT)

show quantity discounts
A100-69
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50mm Rocksilk RS60 Universal Insulation Slab Knauf (pack of 9)

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

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

Guide Price: £41.63 (£49.96 inc VAT)

£6.42/m2 (£7.70/m2 inc VAT)

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A100-72

50mm Rocksilk RS60 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applie..

Guide Price: £41.63 (£49.96 inc VAT)

£6.42/m2 (£7.70/m2 inc VAT)

show quantity discounts
A100-72
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50mm Rocksilk RS100 Universal Insulation Slab Knauf (pack of 6)

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

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

Guide Price: £35.43 (£42.52 inc VAT)

£8.20/m2 (£9.84/m2 inc VAT)

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A10-535

50mm Rocksilk RS100 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory appli..

Guide Price: £35.43 (£42.52 inc VAT)

£8.20/m2 (£9.84/m2 inc VAT)

show quantity discounts
A10-535
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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

£45.31 (£54.37 inc VAT)

£5.24/m2 (£6.29/m2 inc VAT)

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A100-75

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..

£45.31 (£54.37 inc VAT)

£5.24/m2 (£6.29/m2 inc VAT)

show quantity discounts
A100-75
= m2
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25mm EcoTherm EcoVersal PIR Insulation Board

25mm EcoTherm EcoVersal PIR Insulation Board

1200x2400mm - 2.88m2  show quantity discountsDelivery Time: 1 - 5 working days

£26.34 (£31.61 inc VAT)

£9.15/m2 (£10.98/m2 inc VAT)

show quantity discounts
A1-1549
Due to nationwide shortage of PIR insulation lead time may be longer for this product.

25mm Eco-Versal is a foil faced universal solution for insulating walls, floors, pitched roofs, dormer cheeks and ceilings. It is ideal for insulating timber frame walls and can also be used to insulate solid walls internally. EcoTherm Eco-Versal comprises a fibre free rigid polyisocyanurate (PIR) i..

£26.34 (£31.61 inc VAT)

£9.15/m2 (£10.98/m2 inc VAT)

show quantity discounts
A1-1549
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60mm Rockwool Hardrock Multi-Fix (Dual Density ) Fleece Faced Board (pallet of 20)

60mm Rockwool Hardrock Multi-Fix (Dual Density ) Fleece Faced Board (pallet of 20)

1200x1000 - 24.00m2  Delivery Time: 8 - 12 weeks

Guide Price: £522.27 (£626.72 inc VAT)

£21.76/m2 (£26.11/m2 inc VAT)

A1-1473

60mm Rockwool Hardrock Multi-Fix Dual Density Fleece Faced Boards are manufactured from renewable volcanic stone which produces a non-combustible roofing insulation board. A uniquely versatile solution suitable for all roof covering types - torch, pour and roll, single ply, EPDM, liquid applied and ..

Guide Price: £522.27 (£626.72 inc VAT)

£21.76/m2 (£26.11/m2 inc VAT)

A1-1473
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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  Delivery Time: 1 - 2 days

Guide Price: £50.99 (£61.19 inc VAT)

£4.72/m2 (£5.66/m2 inc VAT)

A1-1090

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: £50.99 (£61.19 inc VAT)

£4.72/m2 (£5.66/m2 inc VAT)

A1-1090
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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

Guide Price: £36.44 (£43.73 inc VAT)

£12.65/m2 (£15.18/m2 inc VAT)

show quantity discounts
A10-537

50mm Rockwool RW5 (Prorox SL960) is a high quality resin bonded rigid 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. Th..

Guide Price: £36.44 (£43.73 inc VAT)

£12.65/m2 (£15.18/m2 inc VAT)

show quantity discounts
A10-537
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50mm Rockwool Flexi Insulation Slab - 1200mm x 600mm (pack of 12)

50mm Rockwool Flexi Insulation Slab - 1200mm x 600mm (pack of 12)

1200x600mm - 8.64m2  show quantity discountsDelivery Time: 1 - 2 days

£41.73 (£50.08 inc VAT)

£4.83/m2 (£5.80/m2 inc VAT)

show quantity discounts
A10-376

50mm x1200mm x 600mm Rockwool Flexi Insulation Slab is a unique semi-rigid thermal and acoustic insulation product made from volcanic rock. It has a flexible edge, specifically developed using patented technology for a fast and easy, perfect friction fit between timber and metal frame syst..

£41.73 (£50.08 inc VAT)

£4.83/m2 (£5.80/m2 inc VAT)

show quantity discounts
A10-376
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25mm Rockwool RWA45 Slab (Prorox SL920) - pack of 16

25mm Rockwool RWA45 Slab (Prorox SL920) - pack of 16

600x1200mm - 11.52m2  show quantity discountsDelivery Time: 3 - 5 weeks

Guide Price: £35.88 (£43.06 inc VAT)

£3.11/m2 (£3.73/m2 inc VAT)

show quantity discounts
A1-1370

25mm Rockwool RWA45 is a high quality resin bonded flexible 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 str..

Guide Price: £35.88 (£43.06 inc VAT)

£3.11/m2 (£3.73/m2 inc VAT)

show quantity discounts
A1-1370
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50mm Rockwool Flexi Insulation Slab 1200 x 400mm (pack of 12)

50mm Rockwool Flexi Insulation Slab 1200 x 400mm (pack of 12)

1200x400mm - 5.76m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £42.84 (£51.41 inc VAT)

£7.44/m2 (£8.93/m2 inc VAT)

show quantity discounts
A1-1148

50mm x1200mm x 400mm Rockwool Flexi Insulation Slab is a unique semi-rigid thermal and acoustic insulation product made from volcanic rock. It has a flexible edge, specifically developed using patented technology for a fast and easy, perfect friction fit between timber and metal frame syst..

Guide Price: £42.84 (£51.41 inc VAT)

£7.44/m2 (£8.93/m2 inc VAT)

show quantity discounts
A1-1148
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25mm Yelofoam X2i Cellecta

25mm Yelofoam X2i Cellecta

2500x600mm - 1.5m2  Delivery Time: 2 - 4 days

A10-143

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 products physical propert..

A10-143
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50mm Cellecta Hexatherm XROOF 300L Thermal Roof Insulation Board

50mm Cellecta Hexatherm XROOF 300L Thermal Roof Insulation Board

600x1250mm - 0.75m2  Delivery Time: 2 - 4 days

A1-1256

50mm Cellecta Hexatherm XROOF 300L is an extruded polystyrene thermal insulation board designed specically for inverted roof applications where a high resistance to compression and water absorption is essential. XROOF roof insulation boards are ideal for a multitude of roofing requirements, inc..

A1-1256
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50mm Cellecta Hexatherm XDRAiN Drainage Channel Inverted Roof Board

50mm Cellecta Hexatherm XDRAiN Drainage Channel Inverted Roof Board

600x1250mm - 0.75m2  Delivery Time: 2 - 4 days

A1-1672

50mm Cellecta Hexatherm XDRAiN is a high performance extruded polystyrene inverted thermal roof boards, featuring integrated drainage channels on their underside, which speeds up the shedding of rainwater from the roof, eliminating the need for a separating drainage mat, making them ideal for green ..

A1-1672
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56mm Cellecta Hexatherm XMD Vertical Up-Stand Roof Board

56mm Cellecta Hexatherm XMD Vertical Up-Stand Roof Board

1200x2400mm - 2.88m2  Delivery Time: 2 - 4 days

A1-1661

56mm Cellecta Hexatherm XMD is a high performance extruded polystyrene thermal insulation board bonded to a 6mm thermal laminate facing, suitable for vertical upstands. It combines the benefits of high performance extruded polystyrene with a facing board to produce a composite thermal board to suit ..

A1-1661
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50mm ThermaFleece CosyWool Flexible Slab 390mm x 1200mm (pack of 42).

50mm ThermaFleece CosyWool Flexible Slab 390mm x 1200mm (pack of 42).

1200x390mm - 19.66m2- Free delivery  show quantity discountsDelivery Time: 2 - 5 working days

£168.86 (£202.63 inc VAT)

£8.59/m2 (£10.31/m2 inc VAT)

show quantity discounts
A1-1707

Thermafleece CosyWool Flexible Slab is a versatile low density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly envir..

£168.86 (£202.63 inc VAT)

£8.59/m2 (£10.31/m2 inc VAT)

show quantity discounts
A1-1707
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50mm ThermaFleece NatraHemp Flexible Slab 370mm x 1200mm (pack of 48)

50mm ThermaFleece NatraHemp Flexible Slab 370mm x 1200mm (pack of 48)

1200x370mm - 21.31m2  Delivery Time: 2 - 3 days

Guide Price: £163.09 (£195.71 inc VAT)

£7.65/m2 (£9.18/m2 inc VAT)

A1-1721

Thermafleece NatraHemp Flexible Slab is a medium density insulation rich in home-grown hemp fibres and is a safe, efficient and durable alternative when plant fibre is the preferred choice. Hemp is a fast-growing, low-impact plant crop that produces fine fibres suitable for insulation. Hemp fibres ..

Guide Price: £163.09 (£195.71 inc VAT)

£7.65/m2 (£9.18/m2 inc VAT)

A1-1721
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50mm ThermaFleece UltraWool Flexible Slab 390mm x 1200mm (pack of 30).

50mm ThermaFleece UltraWool Flexible Slab 390mm x 1200mm (pack of 30).

1200x390mm - 14.04m2 - Free Delivery  show quantity discountsDelivery Time: 2 - 3 days

£159.20 (£191.04 inc VAT)

£11.34/m2 (£13.61/m2 inc VAT)

show quantity discounts
A1-1715

Thermafleece UltraWool Flexible Slab is a versatile high density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly environm..

£159.20 (£191.04 inc VAT)

£11.34/m2 (£13.61/m2 inc VAT)

show quantity discounts
A1-1715
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25mm Flat Roof Insulation Board Xtratherm FR-BGM (pack of 18)

25mm Flat Roof Insulation Board Xtratherm FR-BGM (pack of 18)

1200x600mm - 12.96m2  Delivery Time: 3 - 5 days

A1-3185

25mm 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 is suitable to apply torch on felt directly on the insulation. FR-BGM can also be used in mecha..

A1-3185
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25mm Recticel Powerdeck F PIR Insulation Board for Bonded Warm Roof Systems - pack of 20

25mm Recticel Powerdeck F PIR Insulation Board for Bonded Warm Roof Systems - pack of 20

600x1200 - 14.40m2  Delivery Time: 4 - 5 weeks

A1-2613

25mm Recticel Powerdeck F is a durable, high strength PIR insulation board for built-up felt, mastic asphalt and single-ply membrane waterproofing systems. It has a PIR core faced on both sides with a gas tight alkali resistant facing - perforated mineral coated glass fibre tissue to both sides. It ..

A1-2613
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25mm Xtratherm Thin-R FR/ALU Flat Roof PIR Insulation Board (pack of 12)

25mm Xtratherm Thin-R FR/ALU Flat Roof PIR Insulation Board (pack of 12)

2400x1200mm - 34.56m2  Delivery Time: 2 - 3 days

A1-4603

25mm Xtratherm Thin-R FR/ALU Flat Roof PIR Insulation Board is a flat roof insulation with enhanced vapour resistant performance. Thin-R FR/ALU board is faced with low emissivity aluminium facings both sides. Rot proof and will remain effective for the life span of the building. Suitable for us..

A1-4603
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30mm Recticel Powerdeck U PIR Insulation Board for Flat Roof Hot Applied Systems - pack of 16

30mm Recticel Powerdeck U PIR Insulation Board for Flat Roof Hot Applied Systems - pack of 16

600x1200 - 11.52m2  Delivery Time: 1 - 5 working days

A1-2601

30mm Recticel Powerdeck U is a high performance, rigid PIR board for use in warm flat roofs under torch-on with bituminous waterproofing systems for new build and refurbishment projects and in any bitumen compatible single-ply membrane system. It is core faced on both sides with a bituminous glass f..

A1-2601
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30mm Soprema XPS SL Extruded Polystyrene Board (pack of 14)

30mm Soprema XPS SL Extruded Polystyrene Board (pack of 14)

1250x600mm - 10.50m2  show quantity discountsDelivery Time: 2 - 3 days

Guide Price: £88.88 (£106.66 inc VAT)

£8.46/m2 (£10.15/m2 inc VAT)

show quantity discounts
A1-2653

30mm Soprema XPS SL is an extremely durable, high strength extruded polystyrene thermal insulation board offering high water resistance for flat and pitched roofs. It can be stored and installed in severe wet weather conditions with no deterioration during its life. It is easy to cut and custom..

Guide Price: £88.88 (£106.66 inc VAT)

£8.46/m2 (£10.15/m2 inc VAT)

show quantity discounts
A1-2653
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other thicknesses
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