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Inverted Roof Insulation

The inverted roof insulation protects the membrane from extremes of weather, such as frost, UV exposure and the expansion and contraction that comes about from summer/winter temperature cycles. The standard design consideration is that the rain falling on the roof filters through the ballast and between the insulation boards until it reaches the membrane, and then drains away through rainwater outlets. Such insulation is expected to be wet for the majority of its lifetime, and also one has to remember that some water is almost always trapped beneath the insulation boards by capillary action.

During a heavy rainfall, the membrane can become chilled by the water that filters through the ballast and insulation and then sits on top of the membrane, creates a risk that condensation could occur within the build-up of the roof.  In the majority of cases, any condensation that occurs will evaporate once the membrane has warmed up, with no accumulation of condensate. So, the waterproofing must be done on a quite dry surface, and also make sure than the waterproofing membrane doesn't have any cracks. The roof surface must have a correct slope carry the rainwater to draining outlets.

Types of Products
  • Rigid Insulation Boards,
  • Membranes
Rigid Insulation boards
  • Kingspan Styrozone N300R and Styrozone H350R Flat Roof XPS Boards are highly effective rigid insulation boards made from extruded polystyrene core covered with smooth skin on both sides. It is especially designed for protected membrane flat roofs and for green roofs as a popular alternative to traditional roofing systems, whereas its high comprehensive strength makes it ideal for inverted roofing.
  • Cellecta Hexatherm XROOF 300L is an extruded polystyrene thermal insulation board designed specifically 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, including pitch roofs, inverted flat roofs, flat roofs and green roofs.
  • 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 roofs. Manufactured in accordance with BS EN 13374 and tested to BS EN 12267.
  • 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 a specific application. Manufactured in accordance with BS EN 13374 and tested to BS EN 12267.
  • Sundolitt XPS300 is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. It is a lightweight board that is able to withstand extreme loads. Sundolitt XPS300 is highly water resistance, so can be stored and installed in severe wet weather conditions with no deterioration during its life. It is easy to cut and customise on site and requires no special equipment or tools.
Membranes
  • 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 flowing down through the insulation and draining away. It can significantly reduce the insulation thicknesses required to achieve specified U–values.

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17.5mm Polyfoam XPS Laminating Board - (pallet of 68) - 1200mm x 2400mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1200x2400mm - 195.84m2
Delivery Time: 5 - 7 days
17.5mm Polyfoam XPS Laminating Board is a high strength (kPA 200) extruded polystyrene board (XPS) that can be used as a thermal and structural insulation as a fabrication board for a wide variety of manufacturing processes and applications. This board has high resistance to water absorption an..
21mm Polyfoam XPS Laminating Board - (pallet of 56) - 1220mm x 3000mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1220x3000mm - 204.96m2
Delivery Time: 5 - 7 days
21mm Polyfoam XPS Laminating Board is a high strength (kPA 200) extruded polystyrene board (XPS) that can be used as a thermal and structural insulation as a fabrication board for a wide variety of manufacturing processes and applications. This board has high resistance to water absorption and ..
23mm Polyfoam XPS Laminating Board - (pallet of 52) - 1220mm x 3000mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1220x3000mm - 190.32m2
Delivery Time: 5 - 7 days
23mm Polyfoam XPS Laminating Board is a high strength (kPA 200) extruded polystyrene board (XPS) that can be used as a thermal and structural insulation as a fabrication board for a wide variety of manufacturing processes and applications. This board has high resistance to water absorption and ..
25mm Polyfoam XPS Laminating Board - (pallet of 48) - 1220mm x 3000mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1220x3000mm - 175.68m2
Delivery Time: 5 - 7 days
25mm Polyfoam XPS Laminating Board is a high strength (kPA 200) extruded polystyrene board (XPS) that can be used as a thermal and structural insulation as a fabrication board for a wide variety of manufacturing processes and applications. This board has high resistance to water absorption and ..
27mm Polyfoam XPS Laminating Board - (pallet of 44) - 1220mm x 3000mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1220x3000mm - 161.04m2
Delivery Time: 5 - 7 days
27mm Polyfoam XPS Laminating Board is a high strength (kPA 200) extruded polystyrene board (XPS) that can be used as a thermal and structural insulation as a fabrication board for a wide variety of manufacturing processes and applications. This board has high resistance to water absorption and ..
Brand: Kingspan Model and Size: 1250x600mm - 10.50m2
Delivery Time: 7 - 10 days
30mm Kingspan GreenGuard GG300 XPS Board is an insulation for inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring. They have high compressive strength, and a closed cell structure which resists the absorption of ground water and the passage of wat..
£102.70
£123.24 inc VAT
30mm Kingspan Styrozone H350R Flat Roof XPS Board (pack of 14)
Guide Price
Brand: Kingspan Model and Size: 1250x600mm - 10.50m2
Delivery Time: 3 - 5 days
Kingspan Styrozone H350R Flat Roof XPS Board is highly effective rigid insulation board made from extruded polystyrene core covered with smooth skin on both sides. It is especially designed for protected membrane flat roofs, but is also used in green roofs as a popular alternative to tradi..
Guide Price: £74.38
£89.26 inc VAT
30mm Kingspan Styrozone N300R XPS Board (pack of 14)
Guide Price
Brand: Kingspan Model and Size: N300R 30mm - 10.50m2
Delivery Time: 3 - 5 days
30mm Kingspan Styrozone N300R XPS Board is an insulation for inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring. They have high compressive strength, and a closed cell structure which resists the absorption of ground water and the passage of wate..
30mm Soprema XPS SL Extruded Polystyrene Board (pack of 14) 30mm Soprema XPS SL Extruded Polystyrene Board (pack of 14)
Guide Price
Brand: Soprema Model and Size: 1250x600mm - 10.50m2
Delivery Time: 2 - 3 working days
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: £102.21
£122.65 inc VAT
30mm Styrodur 3000CS Extruded Polystyrene Board XPS -  1265mm x 615mm - pack of 14
Guide Price
Model and Size: 1265mm x 615mm - 10.92m2
Delivery Time: 2 - 3 working days
30mm Styrodur 3000CS Extruded Polystyrene Board XPS is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. Styrodur 3000CS is the all-round thermal insulation board with smooth surface and rebated on..
30mm Sundolitt XPS300 Extruded Polystyrene Board (pack of 14) 30mm Sundolitt XPS300 Extruded Polystyrene Board (pack of 14)
Guide Price
Brand: Sundolitt Model and Size: 1200x600mm - 10.08m2
Delivery Time: 2 - 3 working days
30mm Sundolitt XPS300 is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. It is a lightweight board that is able to withstand extreme loads. Sundolitt XPS300 is highly water resistance, so can be stored and installed..
Guide Price: £83.47
£100.16 inc VAT
40mm Ravatherm XPS X 300 SB Extruded Polystyrene Board -  2500mm x 600mm - pack of 8
Guide Price
Brand: Ravago Building Solutions Model and Size: 2500x600mm - 12m2 per pack
Delivery Time: 5 - 7 days
40mm Ravatherm XPS X 300 SB Extruded Polystyrene Board is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. It is a lightweight board that is able to withstand extreme loads. It is highly water resistant pol..
50mm Cellecta Hexatherm XDRAiN Drainage Channel Inverted Roof Board - XPS Insulation 50mm Cellecta Hexatherm XDRAiN Drainage Channel Inverted Roof Board - XPS Insulation
Guide Price
Brand: Cellecta Model and Size: 600x1250mm - 0.75m2
Delivery Time: 2 - 4 days
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 ..
50mm Cellecta Hexatherm XROOF 300L Thermal Roof XPS Insulation Board
Guide Price
Brand: Cellecta Model and Size: 600x1250mm - 0.75m2
Delivery Time: 2 - 4 days
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..
Brand: Kingspan Model and Size: 1250x600mm - 6.00m2
Delivery Time: 5 - 7 days
50mm Kingspan GreenGuard GG500 XPS Board is an insulation for car park decks, and heavy-duty commercial, industrial and cold store flooring. They have high compressive strength, and a closed cell structure which resists the absorption of ground water and the passage of water vapour. The GreenGu..
£127.04
£152.45 inc VAT
50mm Polyfoam XPS Laminating Board - (pallet of 24) - 1220mm x 3000mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1220x3000mm - 87.84m2
Delivery Time: 5 - 7 days
50mm Polyfoam XPS Laminating Board is a high strength (kPA 200) extruded polystyrene board (XPS) that can be used as a thermal and structural insulation as a fabrication board for a wide variety of manufacturing processes and applications. This board has high resistance to water absorption and ..
50mm Polyfoam XPS Roofboard - Extra grade - Extruded Polystyrene Board (pack of 9) - 600mm x 1250mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1250x600mm - 6.75m2
Delivery Time: 5 - 7 days
50mm Polyfoam XPS Roofboard - Extra grade is a high strength (kPA 300) extruded polystyrene board (XPS) with high compressive strength highly resistant to water absorption  suitable for roofing applications. It is a lap jointed board and withstands both occasional and long term s..
50mm Ravatherm XPS X 300 SL Extruded Polystyrene Board - pack of 8
Guide Price
Brand: Ravago Building Solutions Model and Size: 1250x600mm - 6.0m2
Delivery Time: 2 - 3 working days
50mm Ravatherm XPS X 300 SL Extruded Polystyrene Board is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. It is a lightweight board that is able to withstand extreme loads. It is highly water resistant pol..
50mm Ravatherm XPS X 500 SL Extruded Polystyrene Board - pack of 8
Guide Price
Brand: Ravago Building Solutions Model and Size: 1250x600mm - 6.0m2
Delivery Time: 2 - 3 working days
50mm Ravatherm XPS X 500 SL Extruded Polystyrene Board is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. It is a lightweight board that is able to withstand extreme loads. It is highly water resistant pol..
50mm Ravatherm XPS X 700 SL Extruded Polystyrene Board - pack of 8
Guide Price
Brand: Ravago Building Solutions Model and Size: 1250x600mm - 6.0m2
Delivery Time: 2 - 3 working days
50mm Ravatherm XPS X 700 SL Extruded Polystyrene Board is an extremely durable thermal insulation board made of extruded polystyrene offering exceptional thermal performance and versatility. It is a lightweight board that is able to withstand extreme loads. It is highly water resistant pol..
56mm Cellecta Hexatherm XMD Vertical Up-Stand Roof Board - XPS Insulation
Guide Price
Brand: Cellecta Model and Size: 1200x2400mm - 2.88m2
Delivery Time: 2 - 4 days
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 ..
56mm Polyfoam XPS Upstand Board - (50mm XPS + 6mm Facing Board) - pallet of 42 - 600mm x 1200mm
Guide Price
Brand: Polyfoam XPS Model and Size: 1200x600mm - 30.24m2
Delivery Time: 5 - 7 days
56mm Polyfoam XPS Upstand Board is a high strength (kPA 200) extruded polystyrene laminated board used for the thermal insulation and protection of upstand and parapet walls. Polyfoam XPS Upstand board consists of a 50mm high performance rigid extruded polystyrene (XPS) with a tough, weather re..
60mm Kingspan GreenGuard GG700 XPS Board (pack of 7) - Insulation for Car Park Decks, Heavy-duty Industrial, Commercial and Cold Store Floors
Guide Price
Brand: Kingspan Model and Size: 1250x600mm - 5.25m2
Delivery Time: 3 - 5 days
60mm Kingspan GreenGuard GG700 XPS Board is an insulation for car park decks, and heavy-duty commercial, industrial and cold store flooring. They have high compressive strength, and a closed cell structure which resists the absorption of ground water and the passage of water vapour. The GreenGu..
Cellecta HexaTex - Thermal Improvement Membrane for Roofs - 1.5m x 50m roll
Guide Price
Brand: Cellecta Model and Size: 1.5m x 50m - 75m2
Delivery Time: 2 - 3 working days
Cellecta HexaTex is a high performance thermal improvement membrane suitable for use on inverted roofs finished with gravel ballast, and concrete pavers on appropriate supports. Dramatically minimises the cooling effect associated with rainwater flowing down through the insulation and drai..
Brand: Kingspan Model and Size: 3m x 100m - 300m2
Delivery Time: 3 - 5 days
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
Polyfoam Slimline Zero Membrane - 1.5m x 100m Polyfoam Slimline Zero Membrane - 1.5m x 100m
Guide Price
Brand: Polyfoam XPS Model and Size: 100m x 1.5m - 150m2
Delivery Time: 5 - 7 days
Polyfoam Slimline Zero Membrane - 1.5m x 100m is a high performance, thermally bonded tri-laminate of polypropylene waterproofing membrane  to be used over flat roof, inverted roofs and green roofs, to reduce the amount of rain water flowing between the insulation and the waterproofing mem..
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