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INVERTED ROOF

INVERTED ROOF INSULATION

inverted roof detailInverted roof also referred to as a 'secured membrane' is a type of roof construction sequence where the waterproofing layer lies beneath the insulation instead of above it. Insulation boards are loose-laid on top of the membrane and then weighted down with paving slabs, tiles, stones or gravel ballast. Due to the open-jointed roof finish, the insulation can be easily lifted to allow inspection of the waterproofing system. Inverted roof is also called upside down roof as rainwater percolates down through and between the insulation boards to the membrane where it is drained away through rainwater outlets. An inverted roof system doesn’t require an additional air and vapour control layer (AVCL). The main benefits of the inverted roof method is that the membrane is protected by the insulation from the expansion and contraction caused by weather fluctuations such as frost or UV exposure. Inverted roofs ensure that the complete roof construction, including roof covering, is kept at warm temperatures during winter months and at moderate temperatures during the summer months. An inverted roof removes the need for mechanical fixings or adhesives to secure the roof build-up. On other hand the main disadvantage of inverted roof is the fact that the insulation is likely to be wet a lot of the time, with some moisture trapped beneath the boards. Designers also need to be sure that sufficient weight is placed on the boards to prevent movement. Logically, this can only be achieved using insulation specifically designed for this purpose. This material must be highly pressure-resistant and be unaffected by freeze and thaw cycles. The closed cell structure design of XPS thermal insulation is perfect for inverted flat roofs such as green roof or terrace roof. On the other hand rigid extruded polystyrene insulation such as Kingspan GreenGuard, has minimal water absorption due to its closed cell structure. This makes it the only material suitable and approved for inverted roof applications.

INVERTED ROOF INSULATION PRODUCTS

  • Kingspan Optim-R
  • Kingspan Greenguard GG300/500/700
  • Kingspan Styrozone H 350 R
  • Kingspan N300/N500
  • IKO enertherm XPS 
  • XPS Soprema SL
  • Foamglas® Invatherm™
  • ProTherm G XPS X 300 SL
  • ProTherm Quantum® Plus+
  • BauderGlas
  • Polyfoam Roofboard Extra
  • Polyfoam Roofboard Super
  • Syrofoam
  • Finnfoam

 

INVERTED ROOF DETAIL

Rain that falls on the roof percolates through the ballast and between the insulation boards until it reaches the membrane. It then drains away through rainwater outlets. Condensation is on the warm side of the insulation. The build-up of the roof means that some water is almost always trapped beneath the insulation boards by capillary action. The inverted roof build-up design comprised the following details:

  • Ballast
  • Insulation
  • Liquid-applied polyurethane waterproof membrane

INVERTED ROOF VS WARM ROOF

In a warm roof, the insulation material is protected on both sides. First, the roof covering protects the insulation from rain and wind. Second, a vapour barrier protects the insulation from moisture from the inside of the building. On the other hand, an inverted roof is a type of warm roof that is installed upside down. Insulation is simply placed over the roof covering converting roof to green terraces. However, an inverted roof will lose more heat and you will therefore have to use more insulation to obtain the same performance compared to a warm roof. To avoid moisture issues, the inverted roof must also have a greater pitch than a warm roof.

INVERTED ROOF DRAINAGE

Specifications for inverted roofs currently focus on several issues - in particular correct drainage. It is essential that roof falls and drainage paths are correctly designed to avoid ponding and subsequent risk of silt build up, causing stresses in freezing conditions and to reduce water entry in the event of a waterproof layer failure. Drainage points need to be located at the lowest point of the roof, to facilitate effective removal of rainwater. Care is needed to identify the locations of these. For example, since roofing decks will deflect between spans, mid-span may be the lowest point of the roof, rather than the edges or column supports. Where a water flow reducing layer is used, drainage must be provided at the two levels: at the water flow reducing layer level and at the roof deck waterproofing level.

Related articles:

How to choose the right Kingspan insulation board for construction?

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Brand: Unilin Insulation (UK) known as Xtratherm Model: 100mm Unilin ECO360 Roofs
100mm Unilin ECO/MA 360 Roof Insulation is a bio-enhanced, superior performance PIR rigid foam insulation board suitable for sloped roofs (ventilated, hybrid or warm roof). Using pioneering environmentally conscious technology, ECO360 MA in roof applications will reduce heat loss while also deliv..
  • 100mm Unilin ECO/MA 360 Bio-enhanced Roof PIR Insulation Board
  • High performance - Thermal conductivity (lambda value) of 0.020 W/mK
  • Unilin ECO360 Roofs meets U-Values specified in the Building Regulations
  • RIBA/RIAI Climate Challenge 2030, LETI Standards, Future Homes Hub targets
  • Bio-enhanced board will significantly improve the U-Value of new and existing roofs
£ 563.88
Ex Tax:£ 469.90
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 25mm FR/ALU
25mm Xtratherm FR/ALU Flat Roof PIR Insulation Board Thin-R is a top-class polyisocyanurate foam core insulation board with vapour resistant gas-tight foil facers suitable for loose laid ballasted and mechanically fixed single ply waterproofing systems. Thin-R FR/ALU is a thermally efficient roof..
  • BBA Certification No. 11/4817
  • Vapour resistant foil facers
  • Loose laid ballasted systems
  • Thermal Conductivity: 0.022W/mK
  • Compatible with mechanically fixed single ply systems
£ 705.38
Ex Tax:£ 587.82
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 25mm XO/PR Roof
25mm XO/PR Pitched Roof PIR Insulation Board Xtratherm Xtroliner is an improved performance polyisocyanurate rigid foam roof insulation board with robust textured foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtratherm Xtroliner XO/PR 25mm i..
  • Reduced Risk of Condensation
  • High Compressive Strength >150 (kPa)
  • Premium PIR Insulation - Thermal Conductivity: 0.021W/mK
  • Fire: Euroclass C-s2, d0 - BBA Certificate 12/4956
  • Reduces Intrusion into Living Area - Robust Foil Facings
£ 958.12
Ex Tax:£ 798.43
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30-50mm TR/ALU Tapered Roof
Tapered Roof Unilin TR/ALU 30-50mm is the tapered version of Flat Roof FR/ALU, it is faced on both sides with composite gas tight foil facings bonded to a Polyisocyanurate (PIR) core during manufacture. Unilin TR/ALU Tapered Roof systems address most flat roof failures i.e. ponding of rainwater c..
  • Tapered Roof Insulation Board Unilin TR/ALU 30-50mm (1200x1200mm)
  • Unilin TR/ALU Tapered Roof systems address most flat roof failures
  • Unilin TR/ALU is compatible with loose laid ballasted systems
  • Tapered Roof TR/ALU is suitable for new build and refurbishment roofs
  • TR/ALU is compatible with mechanically fixed single ply systems
£ 53.88
Ex Tax:£ 44.90
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30-50mm Unilin TR/BGM
30-50mm Unilin TR/BGM (Torch-on) is a high performance PIR tapered roof insulation with a polypropylene fleece finished bitumen/glass fibre working surface and a mineral glass facing to the underside. Unilin TR/BGM boards are not reversible, they are suitable for use below most bitumen based part..
  • 30-50mm Unilin TR/BGM Tapered Roof Insulation Board (1200x1200mm)
  • Faced with a polypropylene fleece finished bitumen/glass fibre working surface
  • Composite bitumen/glassfibre facing on the reverse side (not reversible)
  • Concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • High performance tapered roof PIR rigid foam insulation board
£ 273.16
Ex Tax:£ 227.63
Estimated delivery: 7-10 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 30-50mm Unilin TR/MG
30-50mm Unilin Tapered Roof TR/MG is a high performance PIR with mineral coated glass facers used below single ply fully adhered roof membranes, waterproofing systems and partially bonded built-up felt. Unilin TR/MG tapered roof insulation boards are embedded in a layer of bitumen on a 3G type fe..
  • 30-50mm Unilin TR/MG Tapered Roof Insulation Board (1200x1200mm)
  • High Performance PIR insulation board with mineral coated glass facers
  • TR/MG can be used below single ply fully adhered roof membranes
  • Can be used in waterproofing systems and partially bonded built-up felt
  • Practical solution to water ponding with insulation and drainage in a single system
£ 294.35
Ex Tax:£ 245.29
Estimated delivery: 7-10 working days
Brand: Kingspan® Model: 30mm GG300
30mm Kingspan GreenGuard GG300 XPS Insulation (Kingspan Styrozone) is an insulation board with high compressive strength for specialist applications such as basements, car parks, inverted roofs and heavy-duty commercial, industrial and cold store flooring. GG300 XPS Board 30mm x 600mm x 1250mm is..
  • 30mm Kingspan GreenGuard GG300 R
  • Rigid XPS Insulation Kingspan Styrozone
  • Fibre-free rigid extruded polystyrene XPS
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 152.24
Ex Tax:£ 126.87
Estimated delivery: 3-5 working days
Brand: Sundolitt Model: 30mm XPS300 Sundolitt
30mm Sundolitt® XPS300 (300kPa) Insulation Board is a highly-durable rigid thermal insulation board made of extruded polystyrene used in high moisture environments such as inverted roofs, flat or zero pitch roofs and green roofs systems. XPS 300 Sundolitt is a lightweight, easy to cut extruded po..
  • 30mm Sundolitt XPS300 Extruded Polystyrene Board
  • XPS Insulation Sheets highly-durable rigid thermal insulation boards
  • High moisture environments | Installed in severe wet weather conditions
  • Lightweight, easy to cut extruded polystyrene insulation 300kPa
  • Great Thermal performance and versatility able to withstand extreme loads
£ 142.14
Ex Tax:£ 118.45
Estimated delivery: 5-7 working days
Brand: Soprema Model: 30mm XPS 300
30mm Soprema XPS 300 SL is a high quality, waterproof and strong rigid extruded polystyrene insulation board used as a durable thermal solution to technically demanding applications where high compressive loading (300kPa) is a requirement. XPS SL 300 1250mm x 600mm x 30mm is designed for use in c..
  • Extruded Foam Polystyrene XPS
  • Pack coverage: 10.5m2
  • Board coverage: 0.75m2
  • Thermal Conductivity: 0.034 W/mk
  • R-Value: 0.9m2K/W
£ 126.88
Ex Tax:£ 105.73
Estimated delivery: 3-5 working days
Brand: BASF Model: 30mm Styrodur XPS
30mm BASF Styrodur® 3000 CS XPS Insulation Board is an innovative multipurpose thermal insulation board made of extruded polystyrene with smooth surfaces and shiplap edges for almost all applications in structural and civil engineering. Styrodur® 3000 CS XPS comes in 1265mm long by 615mm wide she..
  • 30mm Styrodur® 3000 CS XPS (extruded polystyrene) Insulation
  • Innovative multipurpose thermal foam rigid insulation board
  • Smooth surfaces and shiplap edges for almost all applications
  • Styrodur high-compressive and mechanical strength of 300kPa
  • 1265mm long by 615mm wide Extruded Polystyrene XPS Sheets
£ 155.08
Ex Tax:£ 129.23
Estimated delivery: 7-10 working days
Brand: Xtratherm® Model: 30mm Xtratherm XPS 300
30mm Xtratherm XPS 300 is a high performance rigid extruded polystyrene insulation board providing a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. Extruded Polystyrene XPS 300 is an ideal solution for use in commercial, i..
  • 30mm Extruded Polystyrene Xtratherm XPS 300 kPa
  • For use in commercial, industrial and cold storage areas
  • Closed-cell structure, which prevents moisture-absorption
  • Very low lambda values and compressive loading capabilities
  • Xtratherm XPS Sheets are 1250mm long by 600mm wide boards
£ 135.67
Ex Tax:£ 113.06
Estimated delivery: 2-3 working days
Brand: Danosa Model: 40mm Danopren TR40
40mm Danopren XPS TR40 (Styrofoam) Insulation is a closed-cell extruded polystyrene foam board, commonly called 'Blue Board', manufactured as foam thermal insulation sheets used as an insulation in walls, roofs, foundations and as a water barrier. XPS Insulation Danopren is an easy and safe to ha..
  • 40mm Danopren XPS TR40 (Styrofoam) Rigid Insulation Board
  • Closed-cell XPS (extruded polystyrene) foam insulation sheets
  • Commonly called 'Blue Board' high-compressive strength (300kPa)
  • BBA Certified 19/5704 Manufactured without CFC's, HCFC's or HFC's
  • Flat and inverted roofs, floors, residential and commercial applications
£ 104.56
Ex Tax:£ 87.13
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 50mm GG500
50mm Kingspan GreenGuard GG500 XPS Insulation (Kingspan Styrozone) is a rigid XPS board formerly known as Kingspan Styrofoam that can be used for specialist applications where the high compressive strength (stress) is required. GreenGuard GG500 XPS Sheets 50mm x 600mm x 1250mm are resistant to th..
  • 50mm Kingspan GreenGuard GG500 500kPa
  • Rigid XPS Insulation Kingspan Styrozone Styrofoam
  • Fibre-free rigid extruded polystyrene XPS Sheets
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 190.26
Ex Tax:£ 158.55
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: T&G Warm Roof
50mm XO/SK Xtratherm Xtroliner Warm Pitched Roof Insulation is an improved performance PIR (polyisocyanurate) engineered tongue and grooved insulation board with robust textured foil facings designed for use in warm roof construction systems. Xtratherm Xtroliner XO/SK 50mm is a premium external r..
  • BRE Green Guide A+ rating
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire: Euroclass C-s2, d0
  • Robust Tongue & Groove Jointing
  • BBA Certificate 12/4956
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Pre-Order
Brand: Kingspan® Model: 60mm GG700
60mm Kingspan GreenGuard GG700 Rigid XPS Sheet 700kPa (Styrofoam) is an easy to handle and install closed cell extruded polystyrene (XPS) insulation board used mainly as a high performance insulation for basements, car parks, inverted roofs and heavy-duty commercial, industrial and cold store floori..
  • 60mm Kingspan GreenGuard GG700 700kPa
  • Rigid XPS Insulation Kingspan Styrozone Styrofoam
  • Fibre-free rigid extruded polystyrene XPS Sheets
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 233.06
Ex Tax:£ 194.22
Estimated delivery: 7-14 working days
Brand: Soprema Model: 30mm XPS Single Board
30mm Soprema (EFYOS) XPS Insulation Board is a rigid, waterproof and strong extruded polystyrene insulation foam used as a durable thermal solution to technically demanding applications where high compressive loading (300kPa) is a requirement. XPS (Extruded Polystyrene) differs from EPS (Expanded..
  • 30mm Extruded Foam Polystyrene XPS Insulation Board
  • For use in commercial, industrial and cold storage areas
  • Durable thermal solution · Compressive strength of 300kPa
  • Floors · Construction · Basements · Car parks · Below-ground works
  • Swimming pools · Flat and pitched roofs · Inverted and green roofs
£ 12.80
Ex Tax:£ 10.67
Estimated delivery: 2-3 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 125mm Unilin ECO360 Roofs
125mm Unilin ECO360 Roof PIR Board, a rigid foam bio-enhanced PIR core with textured robust low emissivity foil facings, used for sloped roofs (ventilated, hybrid or warm). Using pioneering environmentally conscious technology, ECO360 MA in roof applications will reduce heat loss while also deliv..
  • 125mm Unilin ECO/MA 360 Bio-enhanced Roof PIR Insulation Board
  • High performance - Thermal conductivity (lambda value) of 0.020 W/mK
  • Unilin ECO360 Roofs meets U-Values specified in the Building Regulations
  • RIBA/RIAI Climate Challenge 2030, LETI Standards, Future Homes Hub targets
  • Bio-enhanced board will significantly improve the U-Value of new and existing roofs
£ 635.88
Ex Tax:£ 529.90
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 30mm XO/PR Roof
30mm Xtratherm Xtroliner XO/PR Pitched Roof PIR Insulation Board is an improved performance polyisocyanurate rigid foam roof insulation board with robust textured foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtroliner XO/PR Xtratherm 30mm ..
  • Reduced Risk of Condensation
  • High Compressive Strength >150 (kPa)
  • Premium PIR Insulation - Thermal Conductivity: 0.021W/mK
  • Fire: Euroclass C-s2, d0 - BBA Certificate 12/4956
  • Reduces Intrusion into Living Area - Robust Foil Facings
£ 853.93
Ex Tax:£ 711.61
Estimated delivery: 5-7 working days
Brand: BASF Model: 40mm Styrodur XPS
40mm XPS Styrodur 3000 CS is a rigid foam insulation board made of extruded polystyrene, an innovative multipurpose thermal insulation board with smooth surfaces and shiplap edges for almost all applications in structural and civil engineering. Styrodur® 3000 CS XPS 40mm comes in 1265mm long by 6..
  • 40mm Styrodur® 3000 CS XPS (extruded polystyrene) Insulation
  • Innovative multipurpose thermal foam rigid insulation board
  • Smooth surfaces and shiplap edges for almost all applications
  • Styrodur high-compressive and mechanical strength of 300kPa
  • 1265mm long by 615mm wide Extruded Polystyrene XPS Sheets
£ 148.61
Ex Tax:£ 123.84
Estimated delivery: 7-10 working days
Brand: Xtratherm® Model: 40mm FR/ALU
40mm Xtratherm FR/ALU Flat Roof PIR Insulation Board Thin-R is a top-class polyisocyanurate foam core insulation board with vapour resistant gas-tight foil facers suitable for loose laid ballasted and mechanically fixed single ply waterproofing systems. Xtratherm Thin-R FR/ALU 2400mm x 1200mm x 4..
  • BBA Certification No. 11/4817
  • Vapour resistant foil facers
  • Loose laid ballasted systems
  • Thermal Conductivity: 0.022W/mK
  • Compatible with mechanically fixed single ply systems
£ 509.63
Ex Tax:£ 424.69
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 40mm GG300
40mm Kingspan GreenGuard GG300 is a rigid extruded polystyrene (XPS) insulation board suitable for basements, car parks, inverted roofs and heavy-duty commercial, industrial and cold store flooring. GG300 XPS Board 40mm x 600mm x 1250mm is resistant to the passage of water vapour, moisture and un..
  • 40mm Kingspan GreenGuard GG300 R
  • Rigid XPS Insulation Kingspan Styrozone
  • Fibre-free rigid extruded polystyrene XPS
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 155.88
Ex Tax:£ 129.90
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 40mm Xtratherm XPS 300
40mm Extruded Polystyrene Xtratherm XPS is a rigid foam extruded polystyrene insulation board providing a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. Extruded Polystyrene XPS 300 is an ideal solution for use in commerci..
  • 40mm Extruded Polystyrene Xtratherm XPS 300 kPa
  • For use in commercial, industrial and cold storage areas
  • Closed-cell structure, which prevents moisture-absorption
  • Very low lambda values and compressive loading capabilities
  • Xtratherm XPS Sheets are 1250mm long by 600mm wide boards
£ 148.09
Ex Tax:£ 123.41
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50-70mm Unilin TR/BGM
50-70mm Unilin TR/BGM Torch-on Tapered Insulation, a rigid foam polyisocyanurate board with a mineral-coated glass fibre facing on one side and a composite bitumen/glassfibre facing on the other. Unilin TR/BGM boards are not reversible, they are suitable for use below most bitumen based partially..
  • 50-70mm Unilin TR/BGM Tapered Roof Insulation Board (1200x1200mm)
  • Faced with a polypropylene fleece finished bitumen/glass fibre working surface
  • Composite bitumen/glassfibre facing on the reverse side (not reversible)
  • Concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • High performance tapered roof PIR rigid foam insulation board
£ 231.11
Ex Tax:£ 192.59
Estimated delivery: 7-10 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50-70mm TR/ALU Tapered Roof
50-70mm Unilin TR/ALU Tapered Roof Insulation is a high performance Polyisocyanurate (PIR) Tapered Roof Insulation with vapour-tight aluminium foil facings suitable for use with single ply membranes. Unilin TR/ALU Tapered Roof systems address most flat roof failures i.e. ponding of rainwater caus..
  • 50-70mm Tapered Roof Insulation Board Unilin TR/ALU (1200x1200mm)
  • Unilin TR/ALU Tapered Roof systems address most flat roof failures
  • Unilin TR/ALU is compatible with loose laid ballasted systems
  • Tapered Roof TR/ALU is suitable for new build and refurbishment roofs
  • TR/ALU is compatible with mechanically fixed single ply systems
£ 77.88
Ex Tax:£ 64.90
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 50-70mm Unilin TR/MG
50-70mm TR/MG Unilin Roof Board, comprising a rigid PIR foam core between mineral glass facings used below single ply fully adhered roof membranes, waterproofing systems and partially bonded built-up felt. Unilin TR/MG tapered roof insulation boards are embedded in a layer of bitumen on a 3G type..
  • 50-70mm Unilin TR/MG Tapered Roof Insulation Board (1200x1200mm)
  • High Performance PIR insulation board with mineral coated glass facers
  • TR/MG can be used below single ply fully adhered roof membranes
  • Can be used in waterproofing systems and partially bonded built-up felt
  • Practical solution to water ponding with insulation and drainage in a single system
£ 245.29
Ex Tax:£ 204.41
Estimated delivery: 7-10 working days
Brand: Soprema Model: 50mm XPS 300
50mm Soprema XPS 300 Insulation Board is a strong rigid extruded polystyrene (XPS) foam insulation board used as a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. XPS300 Soprema 50mm x 600mm x 1250mm is designed for use in ..
  • Extruded Foam Polystyrene XPS
  • Pack covaerage: 6.00m2
  • Board covarage: 0.75m2
  • Thermal Conductivity: 0.034 W/mk
  • R-Value: 1.5m2K/W
£ 117.31
Ex Tax:£ 97.76
Estimated delivery: 3-5 working days
Brand: Danosa Model: 50mm Danopren TR50
50mm XPS Danopren (Styrofoam) is a high-compressive and mechanical strength (300kPa) rigid extruded polystyrene (XPS) foam insulation board with shiplap edges used as thermal insulation for roofs, floors, residential and commercial applications. XPS Insulation Danopren 50mm is an easy and safe to..
  • 50mm Danopren XPS TR40 (Styrofoam) Rigid Insulation Board
  • Closed-cell XPS (extruded polystyrene) foam insulation sheets
  • Commonly called 'Blue Board' high-compressive strength (300kPa)
  • BBA Certified 19/5704 Manufactured without CFC's, HCFC's or HFC's
  • Flat and inverted roofs, floors, residential and commercial applications
£ 109.61
Ex Tax:£ 91.34
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 60mm GG500
60mm Kingspan GreenGuard GG500 XPS Insulation (Styrofoam) is an extruded polystyrene insulation board that has the necessary compressive strength of 500kPa to make it the product of choice for basements, car parks, inverted roofs and heavy-duty commercial, industrial and cold store flooring applicat..
  • 60mm Kingspan GreenGuard GG500 500kPa
  • Rigid XPS Insulation Kingspan Styrozone Styrofoam
  • Fibre-free rigid extruded polystyrene XPS Sheets
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 183.59
Ex Tax:£ 152.99
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: T&G Warm Roof
75mm Xtratherm Xtroliner Warm Roof Insulation XO/SK is an engineered tongue and grooved insulation board with robust textured foil facings designed for use in warm roof construction systems. Xtratherm XO/SK is a premium external roof insulation system which meets the passive U-Value of 0.15 W/m2K..
  • BRE Green Guide A+ rating
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire: Euroclass C-s2, d0
  • Robust Tongue & Groove Jointing
  • BBA Certificate 12/4956
£ 479.88
Ex Tax:£ 399.90
Estimated delivery: 7-14 working days
Brand: Kingspan® Model: 80mm GG700
80mm GG700 GreenGuard Kingaspan XPS Insulation Board 700kPa (Styrofoam) is a special rigid closed cell extruded polystyrene (XPS) insulation board used for basements, car parks, inverted roofs and cold store flooring. GreenGuard GG700 XPS Sheets 80mm x 600mm x 1250mm are resistant to the passage ..
  • 80mm Kingspan GreenGuard GG700 700kPa
  • Rigid XPS Insulation Kingspan Styrozone Styrofoam
  • Fibre-free rigid extruded polystyrene XPS Sheets
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 258.82
Ex Tax:£ 215.68
Estimated delivery: 7-14 working days
Brand: Soprema Model: 50mm XPS Single Board
50mm XPS Insulation Board Soprema (EFYOS) is a rigid thermal insulation board made of extruded polystyrene (XPS) foam produced according to climate-friendly CO2 technology used where high compressive strength of 300kPa is needed. Extruded Polystyrene (XPS) differs from Expanded Polystyrene (EPS) ..
  • 50mm Extruded Foam Polystyrene XPS Insulation Board
  • For use in commercial, industrial and cold storage areas
  • Durable thermal solution · Compressive strength of 300kPa
  • Floors · Construction · Basements · Car parks · Below-ground works
  • Swimming pools · Flat and pitched roofs · Inverted and green roofs
£ 17.39
Ex Tax:£ 14.49
Estimated delivery: 2-3 working days
Brand: Sundolitt Model: 50mm XPS300 Sundolitt
50mm Sundolitt XPS300 (300kPa) Insulation Board is a closed-cell rigid thermal insulation board made of extruded polystyrene used in high moisture environments such as inverted roofs, flat or zero pitch roofs and green roofs systems. XPS 300 Sundolitt is a lightweight, easy to cut extruded polyst..
  • 50mm Sundolitt XPS300 Extruded Polystyrene Board
  • XPS Insulation Sheets highly-durable rigid thermal insulation boards
  • High moisture environments | Installed in severe wet weather conditions
  • Lightweight, easy to cut extruded polystyrene insulation 300kPa
  • Great Thermal performance and versatility able to withstand extreme loads
£ 129.20
Ex Tax:£ 107.67
Estimated delivery: 5-7 working days
Brand: Kingspan® Model: 100mm GG700
XPS Insulation Board 700kPa GG700 GreenGuard Kingaspan 100mm is a resistant to ground moisture penetration rigid closed cell extruded polystyrene (XPS) insulation board for basements, car parks, inverted roofs and cold store flooring. 100mm x 600mm x 1250mm GreenGuard GG700 XPS Sheets are resist..
  • 100mm Kingspan GreenGuard GG700 700kPa
  • Rigid XPS Insulation Kingspan Styrozone Styrofoam
  • Fibre-free rigid extruded polystyrene XPS Sheets
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 274.03
Ex Tax:£ 228.36
Estimated delivery: 7-14 working days
Brand: Xtratherm® Model: T&G Warm Roof
100mm Xtratherm Warm Roof XO/SK is an improved performance PIR engineered tongue and grooved insulation board with robust textured foil facings designed for use in warm roof construction systems. Xtratherm Xtroliner XO/SK is a premium external roof insulation system which meets the passive U-Valu..
  • BRE Green Guide A+ rating
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire: Euroclass C-s2, d0
  • Robust Tongue & Groove Jointing
  • BBA Certificate 12/4956
£ 532.80
Ex Tax:£ 444.00
Estimated delivery: 7-14 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 150mm Unilin ECO360 Roofs
150mm ECO/MA360 Unilin Insulation for Roofs, a superior performance bio-enhanced PIR rigid foam thermal insulation board used for sloped, ventilated, hybrid or warm roofs. Using pioneering environmentally conscious technology, ECO360 MA in roof applications will reduce heat loss while also delive..
  • 150mm Unilin ECO/MA 360 Bio-enhanced Roof PIR Insulation Board
  • High performance - Thermal conductivity (lambda value) of 0.020 W/mK
  • Unilin ECO360 Roofs meets U-Values specified in the Building Regulations
  • RIBA/RIAI Climate Challenge 2030, LETI Standards, Future Homes Hub targets
  • Bio-enhanced board will significantly improve the U-Value of new and existing roofs
£ 585.60
Ex Tax:£ 488.00
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 40mm XO/PR Roof
40mm Xtratherm Xtroliner XO/PR Pitched Roof PIR Insulation Board is an improved performance polyisocyanurate rigid foam roof insulation board with robust textured foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtroliner XO/PR Xtratherm 40mm i..
  • Reduced Risk of Condensation
  • High Compressive Strength >150 (kPa)
  • Premium PIR Insulation - Thermal Conductivity: 0.021W/mK
  • Fire: Euroclass C-s2, d0 - BBA Certificate 12/4956
  • Reduces Intrusion into Living Area - Robust Foil Facings
£ 653.63
Ex Tax:£ 544.69
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 50mm FR/ALU
50mm Xtratherm FR/ALU Flat Roof PIR Insulation Board Thin-R is a top-class polyisocyanurate foam core insulation board with vapour resistant gas-tight foil facers suitable for loose laid ballasted and mechanically fixed single ply waterproofing systems. Thin-R Xtratherm FR/ALU 2400mm x 1200mm x 5..
  • BBA Certification No. 11/4817
  • Vapour resistant foil facers
  • Loose laid ballasted systems
  • Thermal Conductivity: 0.022W/mK
  • Compatible with mechanically fixed single ply systems
£ 489.56
Ex Tax:£ 407.97
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 50mm GG300
50mm Kingspan GreenGuard GG300 XPS Insulation is a high performance XPS board formerly known as Kingspan Styrofoam, can be used for specialist applications where the high compressive strength (stress) is required. GreenGuard GG300 XPS Sheets 50mm x 600mm x 1250mm are resistant to the passage of w..
  • 50mm Kingspan GreenGuard GG300 R
  • Rigid XPS Insulation Kingspan Styrozone
  • Fibre-free rigid extruded polystyrene XPS
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 131.24
Ex Tax:£ 109.37
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 50mm Xtratherm XPS 300
50mm Xtratherm XPS 300 is a rigid extruded polystyrene (XPS) foam insulation board providing a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. Extruded Polystyrene XPS 300 is an ideal solution for use in commercial, industr..
  • 50mm Extruded Polystyrene Xtratherm XPS 300 kPa
  • For use in commercial, industrial and cold storage areas
  • Closed-cell structure, which prevents moisture-absorption
  • Very low lambda values and compressive loading capabilities
  • Xtratherm XPS Sheets are 1250mm long by 600mm wide boards
£ 126.10
Ex Tax:£ 105.08
Estimated delivery: 2-3 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 70-90mm TR/ALU Tapered Roof
70-90mm Tapered Roof PIR Board Unilin TR/ALU, comprising a rigid foam Polyisocyanurate (PIR) core sandwiched between low emissivity vapour-tight foil facings used with single ply roof membranes. Unilin TR/ALU Tapered Roof systems address most flat roof failures i.e. ponding of rainwater caused by..
  • 70-90mm Tapered Roof Insulation Board Unilin TR/ALU (1200x1200mm)
  • Unilin TR/ALU Tapered Roof systems address most flat roof failures
  • Unilin TR/ALU is compatible with loose laid ballasted systems
  • Tapered Roof TR/ALU is suitable for new build and refurbishment roofs
  • TR/ALU is compatible with mechanically fixed single ply systems
£ 101.88
Ex Tax:£ 84.90
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 70-90mm Unilin TR/BGM
70-90mm TR/BGM Unilin is a torch-on thermal insulation board used to create or improve falls on limited access concrete, timber or metal flat roof decks in domestic and non-domestic buildings. Unilin TR/BGM boards are not reversible, they are suitable for use below most bitumen based partially bo..
  • 70-90mm Unilin TR/BGM Tapered Roof Insulation Board (1200x1200mm)
  • Faced with a polypropylene fleece finished bitumen/glass fibre working surface
  • Composite bitumen/glassfibre facing on the reverse side (not reversible)
  • Concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • High performance tapered roof PIR rigid foam insulation board
£ 253.90
Ex Tax:£ 211.58
Estimated delivery: 7-10 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 70-90mm Unilin TR/MG
70-90mm TR/MG Unilin Thin-R Tapered Roof is a rigid foam PIR insulation board with mineral coated glass facers used below single ply waterproofing systems and partially bonded built-up felt roofing systems. Unilin TR/MG tapered roof insulation boards are embedded in a layer of bitumen on a 3G typ..
  • 70-90mm Unilin TR/MG Tapered Roof Insulation Board (1200x1200mm)
  • High Performance PIR insulation board with mineral coated glass facers
  • TR/MG can be used below single ply fully adhered roof membranes
  • Can be used in waterproofing systems and partially bonded built-up felt
  • Practical solution to water ponding with insulation and drainage in a single system
£ 272.54
Ex Tax:£ 227.12
Estimated delivery: 7-10 working days
Brand: Sundolitt Model: 75mm XPS300 Sundolitt
Sundolitt® XPS300 (300kPa) Insulation Board 75mm is an extremely durable rigid thermal insulation board made of extruded polystyrene used in high moisture environments such as inverted roofs, flat or zero pitch roofs and green roofs systems. XPS 300 Sundolitt® is a lightweight, easy to cut extrud..
  • 75mm Sundolitt XPS300 Extruded Polystyrene Board
  • XPS Insulation Sheets highly-durable rigid thermal insulation boards
  • High moisture environments | Installed in severe wet weather conditions
  • Lightweight, easy to cut extruded polystyrene insulation 300kPa
  • Great Thermal performance and versatility able to withstand extreme loads
£ 118.99
Ex Tax:£ 99.16
Estimated delivery: 5-7 working days
Brand: Kingspan® Model: 80mm GG500
80mm Kingspan GreenGuard GG500 XPS Sheet (Kingspan Styrofoam) is a high compressive strength 500kPa, closed cell extruded polystyrene rigid insulation board used mainly as a high performance insulation for basements, car parks, inverted roofs and heavy-duty commercial, industrial and cold store floo..
  • 80mm Kingspan GreenGuard GG500 500kPa
  • Rigid XPS Insulation Kingspan Styrozone Styrofoam
  • Fibre-free rigid extruded polystyrene XPS Sheets
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 205.49
Ex Tax:£ 171.24
Estimated delivery: 5-7 working days
Brand: Soprema Model: 80mm XPS 300
80mm Soprema XPS 300 SL is a high quality, waterproof and strong rigid extruded polystyrene insulation board used as a durable thermal solution to technically demanding applications where high compressive loading (300kPa) is a requirement. XPS SL 300 1250mm x 600mm x 80mm is designed for use in c..
  • Extruded Foam Polystyrene XPS
  • Pack coverage: 3.75m2
  • Board coverage: 0.75m2
  • Thermal Conductivity: 0.036 W/mk
  • R-Value: 2.2m2K/W
£ 105.50
Ex Tax:£ 87.92
Estimated delivery: 3-5 working days
Brand: Danosa Model: 60mm Danopren TR60
Danopren XPS TR60 (Styrofoam) Insulation Board 60mm is a robust extruded polystyrene foam board with ship-lap edges used as a thermal insulation board for flat roofs, inverted roofs, floors with overloads, for residential and commercial applications. 60mm XPS Insulation Danopren is an easy and sa..
  • 60mm Danopren XPS TR40 (Styrofoam) Rigid Insulation Board
  • Closed-cell XPS (extruded polystyrene) foam insulation sheets
  • Commonly called 'Blue Board' high-compressive strength (300kPa)
  • BBA Certified 19/5704 Manufactured without CFC's, HCFC's or HFC's
  • Flat and inverted roofs, floors, residential and commercial applications
£ 103.34
Ex Tax:£ 86.12
Estimated delivery: 3-5 working days
Brand: Soprema Model: 80mm XPS Single Board
80mm XPS Thermal Insulation Sheet Soprema is a high-performance extruded polystyrene insulation foam board used as a durable thermal solution to technically demanding applications where high compressive loading (300kPa) is required. Soprema XPS Thermal Insulation Board is an industry-leading rang..
  • 80mm Extruded Foam Polystyrene XPS Insulation Board
  • For use in commercial, industrial and cold storage areas
  • Durable thermal solution · Compressive strength of 300kPa
  • Floors · Construction · Basements · Car parks · Below-ground works
  • Swimming pools · Flat and pitched roofs · Inverted and green roofs
£ 23.10
Ex Tax:£ 19.25
Estimated delivery: 2-3 working days
Brand: BASF Model: 50mm Styrodur XPS
STYRODUR 3000 CS XPS Extruded Polystyrene Sheet is a 50mm thick multipurpose thermal insulation board made of extruded polystyrene with smooth surfaces and shiplap edges for almost all applications in structural and civil engineering. 50mm Styrodur® XPS comes in 1265mm long by 615mm wide sheets a..
  • 50mm Styrodur® 3000 CS XPS (extruded polystyrene) Insulation
  • Innovative multipurpose thermal foam rigid insulation board
  • Smooth surfaces and shiplap edges for almost all applications
  • Styrodur high-compressive and mechanical strength of 300kPa
  • 1265mm long by 615mm wide Extruded Polystyrene XPS Sheets
£ 158.44
Ex Tax:£ 132.03
Estimated delivery: 7-10 working days
Brand: Soprema Model: 100mm XPS 300
100mm Soprema XPS 300 SL is a high quality, waterproof and strong rigid extruded polystyrene insulation board used as a durable thermal solution to technically demanding applications where high compressive loading (300kPa) is a requirement. XPS SL 300 1250mm x 600mm x 100mm is designed for use in..
  • Extruded Foam Polystyrene XPS
  • Pack coverage: 3.0m2
  • Board coverage: 0.75m2
  • Thermal Conductivity: 0.036 W/mk
  • R-Value: 2.8m2K/W
£ 103.34
Ex Tax:£ 86.12
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: T&G Warm Roof
125mm Xtratherm Xtroliner Warm Pitched Roof Insulation XO/SK is an improved performance PIR (polyisocyanurate) engineered tongue and grooved insulation board with robust textured foil facings designed for use in warm roof construction systems. Xtratherm Xtroliner XO/SK is a premium external roof ..
  • BRE Green Guide A+ rating
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire: Euroclass C-s2, d0
  • Robust Tongue & Groove Jointing
  • BBA Certificate 12/4956
£ 562.80
Ex Tax:£ 469.00
Estimated delivery: Pre-Order
Brand: Xtratherm® Model: 50mm XO/PR Roof
50mm Xtratherm Xtroliner XO/PR Pitched Roof PIR Insulation Board is an improved performance polyisocyanurate rigid foam roof insulation board with robust textured foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtroliner XO/PR Xtratherm 50mm i..
  • Reduced Risk of Condensation
  • High Compressive Strength >150 (kPa)
  • Premium PIR Insulation - Thermal Conductivity: 0.021W/mK
  • Fire: Euroclass C-s2, d0 - BBA Certificate 12/4956
  • Reduces Intrusion into Living Area - Robust Foil Facings
£ 614.90
Ex Tax:£ 512.42
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 60mm FR/ALU
60mm Xtratherm Thin-R FR/ALU Flat Roof PIR Insulation Board is a top-class polyisocyanurate foam core rigid insulation board with vapour resistant gas-tight foil facers suitable for loose laid ballasted and mechanically fixed single ply waterproofing systems. Thin-R FR/ALU Xtratherm 2400mm x 1200..
  • BBA Certification No. 11/4817
  • Vapour resistant foil facers
  • Loose laid ballasted systems
  • Thermal Conductivity: 0.022W/mK
  • Compatible with mechanically fixed single ply systems
£ 471.96
Ex Tax:£ 393.30
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 60mm GG300
Kingspan GreenGuard GG300 (Styrofoam) is a 60mm thick extruded polystyrene (XPS) rigid insulation board used for basements, car parks, inverted roofs and heavy-duty commercial, industrial and cold store flooring applications. GreenGuard GG300 XPS Sheets 60mm x 600mm x 1250mm are resistant to the ..
  • 60mm Kingspan GreenGuard GG300 R
  • Rigid XPS Insulation Kingspan Styrozone
  • Fibre-free rigid extruded polystyrene XPS
  • Insulation board with high compressive strength (stress)
  • Basements, car parks, inverted roofs and cold store flooring
£ 164.09
Ex Tax:£ 136.74
Estimated delivery: 3-5 working days
Brand: BASF Model: 60mm Styrodur XPS
The 60mm XPS Insulation Sheet Styrodur 3000 CS BASF is an extremely durable multipurpose thermal insulation board made of extruded polystyrene with smooth surfaces and shiplap edges for almost all applications in structural and civil engineering. 60mm Styrodur® XPS comes in 1265mm long by 615mm w..
  • 60mm Styrodur® 3000 CS XPS (extruded polystyrene) Insulation
  • Innovative multipurpose thermal foam rigid insulation board
  • Smooth surfaces and shiplap edges for almost all applications
  • Styrodur high-compressive and mechanical strength of 300kPa
  • 1265mm long by 615mm wide Extruded Polystyrene XPS Sheets
£ 161.54
Ex Tax:£ 134.62
Estimated delivery: 7-10 working days
Brand: Xtratherm® Model: 60mm Xtratherm XPS 300
60mm Xtratherm XPS 300 is an insulation board made of extruded polystyrene foam which provides a durable thermal solution to technically demanding applications where high compressive loading of 300kPa is a requirement. XPS Rigid Foam Insulation Boards are suitable for many demanding and varied in..
  • 60mm Extruded Polystyrene Xtratherm XPS 300 kPa
  • For use in commercial, industrial and cold storage areas
  • Closed-cell structure, which prevents moisture-absorption
  • Very low lambda values and compressive loading capabilities
  • Xtratherm XPS Sheets are 1250mm long by 600mm wide boards
£ 138.71
Ex Tax:£ 115.59
Estimated delivery: 5-7 working days
Brand: Danosa Model: 80mm Danopren TR80
80mm XPS Danopren TR80 (Styrofoam) Insulation Sheet is a rigid ship-lap edges extruded polystyrene long-term foam board used as a thermal insulation for flat roofs, inverted roofs, floors with overloads, for residential and commercial applications. XPS Insulation Danopren 80mm is an easy and safe..
  • 80mm Danopren XPS TR40 (Styrofoam) Rigid Insulation Board
  • Closed-cell XPS (extruded polystyrene) foam insulation sheets
  • Commonly called 'Blue Board' high-compressive strength (300kPa)
  • BBA Certified 19/5704 Manufactured without CFC's, HCFC's or HFC's
  • Flat and inverted roofs, floors, residential and commercial applications
£ 109.80
Ex Tax:£ 91.50
Estimated delivery: 3-5 working days