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ANGLED ROOF INSULATION

PITCHED ROOF INSULATION

Pitched roof insulation is a type of protection that can be inserted both between and underneath the rafters to extend the thermal performance up along the pitch of the roof, essentially creating a new, heated room within the loft area. Pitched roof consisting of two angled pieces which meet in the middle, with a piece called a gable at either end. In places such as the United Kingdom, where they have turbulent winters, they build with a very deep pitch so that the roof doesn’t accumulate snow.

PITCHED ROOF INSULATION TYPES

In terms of a pitched roof insulation, there are 4 options to choose from:

1. PIR PITCHED ROOF INSULATION BOARD

It is ideal for in-between and under rafters in a pitched roof. Depending of thickness and brand, rigid insulation boards come in multiple name options, including Celotex GA4000, Celotex TB4000, Celotex XR4000, Xtratherm Thin-R, Kingspan TF70, Kingspan TP10, Kingspan TW55, Recticel Eurothane GP, Quinntherm, EcoTherm EcoVersal, IKO Enertherm ALU and Ballytherm PIR.

Cost: £18.78/m² (ex VAT), £19/m² installation
Advantages: easy to install, space-saving insulation

2. FIBREGLASS PITCHED ROOF INSULATION ROLL

Glass wool is one of the most popular insulation used to insulate pitched roofs. Fibreglass insulation called 'loft board' or 'loft roll' is essentially an insulating material that is built into your pitched roof usually between the rafters. Fibreglass pitched roof insulation roll is probably the most common, cheap and non-combustible type of insulation used to insulate pitched roof, however it’s itchy and gets everywhere with very little effort.
To get decent thermal performance, you need a lot of insulation rolls which can quickly eat into your loft space. If you consider the economic point and the fact that common spacing of UK rafters are 400mm or 600mm, loft roll is absolutely the best type of insulation that can be used to insulate a pitched roof. Rolls are 1200mm wide and ready-cut to produce three, 400mm wide rolls, or two, 600mm wide rolls and manufactured to a minimum density of 10kg/m3 meeting the requirements outlined within related Building Regulations. It means, you have no offcuts and you can insulate the roof yourself. Moreover, rolls work out cheaper therefore they become the most favoured option from all of available roof insulation types. This is one of the most popular types of insulation, mainly due to the fact it’s been around for so long and is widely available from most building merchants such as Screwfix, B&Q or Wickes.

Cost: £2.96/m² (ex VAT) 100mm, £16/m² installation
Disadvantages: irritating during installation, takes a lot of space 

3. ROCK WOOL ROOF INSULATION

Rock wool roof insulation is manufactured in sheets that are pre-cut to fit between any joist spacing to provide extra insulation within your pitched roof. Boards will boost thermal performance, improve acoustics and insulate between rafters. Slabs are provided in sizes that are easily transportable and good for handling measuring 1200mm x 600mm. When it comes to best soundproof roof insulation boards between the rafters, Rockwool and Knauf are main players in the UK market. General-purpose rock wool insulation boards such as RWA45, RW5 or RW3 are perfect for pitched roof applications. As of 2022 most popular insulation slab 150mm Rocksilk RS45 Knauf cost £36.36 per m2.

Cost: £10.51/m² (ex VAT)100mm, £19/m² installation
Disadvantages: irritating during installation, if any moisture settles in the insulation fabric it will eventually rot.

4. PHENOLIC BOARDS

The product has a declared thermal conductivity λ value ranging from 0.018 to 0.021WmK and is good to be used as an insulation above the rafters and as a thermal insulation board between and below rafters, in tiled and slated pitched roofs.  Panels are very often associated with brands such as Kingspan® and Xtratherm®. Kingspan® offers Kooltherm K107 manufactured with a blowing agent that has zero ODP and low GWP. On the other hand Xtratherm® offers a high-class rigid phenolic foam insulation board with a low emissivity foil facings called SR/PR Safe-R with thermal conductivity of 0.021W/mK. However, Kingspan® offers a slightly lower thermal conductivity by a minimum of 0.03W/mK. To create a warm pitched roof, insulation such as Kingspan Kooltherm K107 Pitched Roof Board, should be fitted between and over the rafters
Phenolic range includes the following readily available product thicknesses: 25mm ǀ 40mm ǀ 50mm ǀ 60mm ǀ 75mm ǀ 80mm ǀ 100mm and 120mm. Boards are manufactured from closed-cell phenolic foam, faced with a (perforated) bilaminate aluminium foil, bonded to glass tissue on both sides, with the sizes 2400mm x 1200mm.

Cost: £41.16/m² (ex VAT)100mm, £18/m² installation
Disadvantages: expensive to buy, causes pipework corrosion, should not be used on buildings in England and Wales that have a store at least 18m above ground level

PITCHED ROOF INSULATION COST | PRICES

The amount of money you spend on pitched roof insulation can vary greatly depending on the type, so it's important to know what you're getting before you buy. As of 2022 the cheapest type of pitched roof insulation would be fibreglass (glass wool). However PIR insulation boards are a better solution, enabling greater thermal insulation than standard mineral wool. In terms of m2 coverage cost, pitched roof insulation can be classified in particular order:

  1. Fibreglass Insulation - £2.96/m²
  2. Rockwool Insulation - £10.51/m²
  3. PIR Rigid Insulation Boards - £18.78/m²
  4. Phenolic Boards Insulation - £41.16/m²

But when it comes to performance the list takes the following form:

  1. Phenolic Boards Insulation - Thermal Conductivity of 0.018W/mK
  2. PIR Rigid Insulation Boards - Thermal Conductivity of 0.022W/mK
  3. Rock wool Insulation - Thermal Conductivity of 0.035W/mK
  4. Fibreglass Insulation - Thermal Conductivity of 0.044W/mK


PITCHED ROOF INSULATING METHODS

There are several ways to insulate pitched roof:


UNDER RAFTERS & BETWEEN RAFTERS (INTERNAL)

One of the benefits of insulating at rafter level is that insulation can be provided both above and between the rafters. These can combine to achieve relatively high performance standards. The extent and type of insulation that can be provided between the rafters will be dictated by the size of the rafters, which can vary considerably from slender timbers as little as 75mm deep to those that are 225mm deep or more. Obviously, the greater the depth of the rafters the more opportunity there is to provide insulation thereby reducing the amount of insulation required above the rafters and consequently the height the roof needs to be raised. Ideal for projects where there is access to the internal side of the roof and the external roof finish is not being removed or replaced. There are several types of materials suitable for insulation between the rafters. The most appropriate materials are fibreglass, PIR rigid insulation, phenolic boards or natural-fibre based insulation such as sheep’s wool or hemp fibre. 

OVER RAFTERS (EXTERNAL)

Insulating a pitched roof above the rafters is the common method chosen for new builds and re-roofing existing detached buildings as it provides superior thermal performance for the building. Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building.
To create a warm pitched roof, insulation should be fitted over the rafters. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation. This roof type will require a breathable membrane to be fitted above the insulation. This over-rafter insulation method reduces thermal bridging, giving an airtight continuous layer of high-performance insulation and results in a well-insulated attic space. Best suited for projects where there is access to the external side of the roof, this could include applications where there is restricted access internally. The ‘warm roof’ system is used extensively in new construction and the systems for installing insulation in modern buildings are well understood. Insulation added above rafters will typically be a Rigid Insulating Board.

This method of installing roof insulation allows you to maximise the headroom by using a thinner layer of insulation beneath the rafters, whilst achieving U-Values which will ensure you comply with Building Regulations and have a roof space or loft which is comfortable for its occupants.

CEILING LEVEL INSULATION

Insulating a pitched roof at ceiling level is a cost-effective way of installing roof insulation where the attic space will not be used as a living area. The thickness of insulation is largely unrestricted by construction so the layer of insulation can be deeper to achieve better performance as required. Airtightness and ventilation in the roof space are important considerations when installing insulation at ceiling level to avoid condensation forming on top of the insulation and other surfaces in the cold space. 


PITCHED ROOF INSULATION BUILDING REGULATIONS

The Approved Document that accompanies Part L of the Building Regulations for existing dwellings (ADL1B 2010) calls for insulation between the rafters of a pitched roof to have a U-value of 0.18 W/m2K. Such levels of insulation are quite high, but are potentially achievable in ways that are not harmful to historic buildings. U-values measure how quickly energy will pass through one square metre of a barrier when the air temperatures on either side differ by one degree. U-values are expressed in units of Watts per square metre per degree of temperature difference (W/m2K).
It is difficult for many older buildings to achieve a U-value of 0.18W/m2K if there are constraints on the thickness of insulation that can be provided above the rafters. For example, to reach a U value of 0.18 W/m2K in a roof with a non-insulating ceiling and 150mm of insulation between rafters requires an insulating sarking board of about 70mm thickness. Part L of the Building Regulations allows for exemptions and special considerations for historic buildings which enables Building Control Officers or Approved Inspectors to take a pragmatic view in order to conserve the appearance and character of the building and avoid technical risks. Achieving a U value of 0.18W/m² will need 120mm thickness of rigid foam or 270mm of mineral wool. Hitting 'passive house' levels of 0.13W/m² will need 300mm of mineral wool or 180mm of rigid foam. 

HOW TO INSULATE A PITCHED ROOF FROM INSIDE?

If there is no access from outside, the only option left would be to insulate from inside. In this case, we would suggest fitting insulation between the rafters and insulated plasterboard to the inside face of the rafters. Usually this construction is a ventilated roof which will have a sarking felt. Ventilated roofs require a 50 mm air gap above the insulation, timber stop battens can be nailed into the side of the rafters to give the correct air gap when installing the insulation. The insulated plasterboard should then be placed with the long edges running across the rafters.

PITCHED ROOF INSULATION THICKNESS

The depth of insulation is dependent on the U-values required and the depth of the rafters. Mineral wool rolls are ubiquitous and cheap, meaning a whole roof on a standard home could be insulated to the recommended thickness of 270mm. When it comes to PIR pitched boards it is recommended to use 130mm thickness. In England, the as mentioned earlier, required minimum U-value for pitched roofs insulated at rafter level is 0.18 W/m²K or lower. This equates to a 175mm of rock wool slab insulation. 
 

Video credit:https://www.youtube.com/watch?v=qzlylgc4sqU

 

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Brand: Knauf® Model: 100mm Knauf Loft Roll 44
100mm Knauf Earthwool Loft Roll 44 Combi-Cut is a flexible highly-durable non-combustible glass mineral wool loft insulation roll manufactured using Knauf ECOSE Technology with Euroclass A1 reaction to fire classification used for insulation between and over the joists in cold lofts where pitched ro..
  • Non-combustible
  • Over joists Insulation
  • Between joists Insulation
  • Reaction to Fire Euroclass A1
  • Highly durable, Odourless, Rot proof, Non-hygroscopic
£ 62.54
Ex Tax:£ 52.12
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 100mm Unilin ECO Sarking
100mm Unilin ECO/MA 360 (Sarking) Pitched Warm Roof Insulation is a bio-enhanced, superior performance PIR (polyisocyanurate) rigid foam insulation board suitable for pitched roofs. Unilin Sarking Warm Roof Construction Board has the strength and thermal properties required to reach the high perf..
  • 100mm Unilin ECO/MA 360 Bio-enhanced Roof Insulation (SARKING)
  • High performance - Thermal conductivity (lambda value) of 0.020 W/mK
  • Unilin ECO360 Sarking 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: URSA® Model: 100mm URSA 10
100mm URSA 10 Diverso Loft Insulation Roll is a lightweight easy to install, non-combustible, unfaced glass mineral wool loft insulation roll used as a loft insulation in cold pitched roofs. URSA 10 Glass Mineral Wool Insulation Roll 100mm is perforated to allow it to be split into either 2 x 570..
  • Non-combustible
  • Over joists Insulation
  • Between joists Insulation
  • Reaction to Fire Euroclass A1
  • Highly durable, Odourless, Rot proof, Non-hygroscopic
£ 59.17
Ex Tax:£ 49.31
Estimated delivery: 3-5 working days
Brand: Celotex® Model: 110mm XR4000
110mm Celotex XR4000 PIR Insulation Board (XR4110) is an easy to cut and install multi-purpose polyisocyanurate rigid foam insulation board featuring a low emissivity foil facings that is suitable for floor, wall, roof and ceiling cut-to-fit applications. Celotex Insulation Board is an excellent ..
  • Size: 2400mm x 1200mm
  • Board covarage: 2.88m2
  • Thermal Conductivity: 0.022 W/mk
  • Surface spread of flame: Class 1
  • BBA Approved (Cert no 17/5405, 16/5352)
£ 1,437.01
Ex Tax:£ 1,197.51
Estimated delivery: 5-7 working days
Brand: Celotex® Model: 12mm TB4000
12mm Celotex TB4000 PIR Insulation Board (TB4012) is an easy to cut and install multi-purpose polyisocyanurate rigid foam insulation board featuring a low emissivity foil facings that is suitable for floor, wall, ceiling and roof cut-to-fit applications. Celotex Board is an excellent high-perform..
  • Size: 2400mm x 1200mm
  • Board covarage: 2.88m2
  • Thermal Conductivity: 0.022 W/mk
  • Surface spread of flame: Class 1
  • BBA Approved (Cert no 17/5405, 16/5352)
£ 0.00
Ex Tax:£ 0.00
Estimated delivery: Out Of Stock
Brand: Xtratherm® Model: 1200 x 1200 x 15mm
15mm PIR Rigid Insulation Board Xtratherm (Unilin) 1200mm x 1200mm is a thinnest rigid foil faced polyisocyanurate (PIR) thermal foam insulation board designed for roofs, walls, floors, timber and steel framed systems. Unilin (Xtratherm) PIR insulation boards are stable, rot proof and will remain..
  • 1200mm x 1200mm x 15mm
  • Foil Faced PIR Rigid Foam Insulation Board
  • Certified thermal conductivity as low as 0.022W/mK!
  • Thinnest foil faced polyisocyanurate insulation board
  • Designed for roofs, walls, floors, timber and steel framed systems
£ 17.16
Ex Tax:£ 14.30
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 15mm Unilin XT/PR
15mm Unilin XT/PR Thin-R Pitched Roof PIR Insulation Board is a thinnest PIR rigid thermal foam insulation board used in roof construction to achieve Future Home and Passive House Standards. XT/PR Unilin PIR Board is a high performance foil faced rigid insulation foam with a certified thermal con..
  • 15mm Unilin PIR Polyisocyanurate Rigid Foam Insulation Board
  • Declared Lambda value of 0.022 W/mK (Thermal Conductivity)
  • 15mm x 1200mm x 2400mm Foil Faced PIR Insulation Sheet
  • Reducing heat loss and saving money on future energy bills
  • Unilin Insulation Thin-R XT/PR Pitched Roof Insulation Board
£ 33.08
Ex Tax:£ 27.57
Estimated delivery: 2-3 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 15mm Unilin XT/TF
15mm Unilin XT/TF Thin-R Timber Frame Insulation Board is a thinnest PIR rigid thermal foam insulation board used in wall construction to achieve Future Home and Passive House Standards. XT/TF Unilin PIR Board is a high performance foil faced rigid insulation foam with a certified thermal conduct..
  • Unilin Insulation Thin-R XT/TF Timber Frame (Walls) Insulation Board
  • Declared Lambda value of 0.022 W/mK (Thermal Conductivity)
  • 15mm x 1200mm x 2400mm Foil Faced PIR Insulation Sheet
  • Reducing heat loss and saving money on future energy bills
  • 15mm Unilin PIR Polyisocyanurate Rigid Foam Insulation Board
£ 33.08
Ex Tax:£ 27.57
Estimated delivery: 2-3 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 15mm Unilin XT/UF
15mm Unilin XT/UF Thin-R Floor Insulation Board is a thinnest PIR rigid thermal foam insulation board used in floor construction to achieve Future Home and Passive House Standards. XT/UF Underfloor Unilin PIR Board is a high performance insulation with a certified thermal conductivity of 0.022W/m..
  • 15mm Unilin PIR Polyisocyanurate Rigid Foam Insulation Board
  • Declared Lambda value of 0.022 W/mK (Thermal Conductivity)
  • 15mm x 1200mm x 2400mm Foil Faced PIR Insulation Sheet
  • Reducing heat loss and saving money on future energy bills
  • Unilin Insulation Thin-R XT/UF Floor (Underfloor) Insulation Board
£ 35.40
Ex Tax:£ 29.50
Estimated delivery: 2-3 working days
Brand: Xtratherm® Model: 15mm PIR
15mm Unilin (Xtratherm) Thin-R Insulation Board (2400mm x 1200mm x 15mm) is an ultra thin rigid foil faced polyisocyanurate (PIR) thermal foam multi-application insulation board designed for roofs, walls, floors, timber and steel framed systems. Xtratherm (Unilin) Thin-R range is a high-efficienc..
  • Size: 1200mm x 2400mm
  • Foil Faced PIR Rigid Insulation Board
  • Thermal Conductivity: 0.022 W/mk
  • R-Value: 0.68m2K/W
  • Surface spread of flame: Class 1
£ 34.34
Ex Tax:£ 28.62
Estimated delivery: 2-3 working days
Brand: Kingspan® Model: 20mm Thermapitch TP10
Kingspan ThermaPitch TP10 Board 20mm is a high performance pitched roof insulation board with fibre-free rigid thermoset PIR foam core used for under rafter or between and over joist applications. 20mm Thermapitch TP10 Kingspan PIR 2400mm x 1200mm board is an insulation sheet suitable for tiled o..
  • Thermal conductivity of 0.022 W/mK
  • Easy to handle and install
  • BBA Certificate 14/5133
  • NSAI Agrément Certificate 03/0196
  • INSULATION FOR TILED OR SLATED PITCHED WARM ROOF SPACES
£ 45.72
Ex Tax:£ 38.10
Estimated delivery: 5-7 working days
Brand: Kingspan® Model: 20mm Thermawall TW55
20mm Kingspan Thermawall TW55 Insulation Board is a rigid insulation board used between studs or as an insulating sheathing material for steel and timber framing wall applications. Thermawall TW55 Kingspan is a high performance insulation board suitable for use with timber frame and steel frame w..
  • Thermal conductivity of 0.022 W/mK
  • Easy to handle and install
  • BBA Certificate 14/5133
  • NSAI Agrément Certificate 03/0196
  • INSULATION FOR TIMBER AND STEEL FRAMING SYSTEMS
£ 46.19
Ex Tax:£ 38.49
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 21mm FR/TP
21mm Xtratherm FR/TP Thin-R Thermal Ply Composite Board for Flat Roof is an insulated panel consist of PIR (polyisocyanurate) core with a composite foil facings, bonded to 6mm WBP grade plywood designed for new and refurbishment flat roofs. FR/TP PIR and Plywood For Flat Roof is a three-in-one so..
  • Insulation & Decking in one Fix
  • Vapour Control Layer build in
  • For New & Refurbishment Roofs
  • Rapid Weather Proofing
  • PlyDeck FR/TP Square Edge
£ 79.79
Ex Tax:£ 66.49
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 21mm Unilin FR/TP
21mm Unilin FR/TP Warm Roof Insulation Decking is an insulated panel made of 15mm PIR rigid foam insulation core bonded to 6mm WBP grade plywood used for new and refurbishment flat roof applications. Unilin FR/TP Thermal Ply Flat Roof Insulation Board is faced to the under side with a gas-tight f..
  • 21mm Unilin FR/TP Warm Roof Insulation Board Decking
  • Used for new and refurbishment flat roof applications
  • Creates a continuous Vapour Control Layer (Vapour Barrier)
  • PIR foam insulation core and 6mm plywood insulated decking
  • Unilin FR/TP Thermal ply flat roof insulation over joists
£ 77.88
Ex Tax:£ 64.90
Estimated delivery: 3-5 working days
Brand: British Gypsum® Model: 22mm British-Gypsum
22mm Gyproc Thermaline Basic Insulated Plasterboard is a 9.5mm Gyproc wall board factory-bonded to CFC and HCFC-free expanded polystyrene insulation core used where a basic level of thermal insulation is required. BG Gyproc ThermaLine basic is a standard insulated plasterboard suitable for drylin..
  • Board Coverage: 2.88m2
  • Thermal Conductivity: 0.038 W/mK
  • Polystyrene with 9.5mm Gyproc WallBoard
  • Plasterboard - Tapered Edge profile (T.E)
  • EPS Insulation bonded to 9.5mm Plasterboard
£ 38.09
Ex Tax:£ 31.74
Estimated delivery: 2-3 working days
Brand: Knauf® Model: 22mm Knauf
22mm Knauf EPS Thermal Laminate is an insulation board bonded to 9.5mm tapered edge plasterboard with a certified thermal conductivity of 0.038W/mK that can be used in both refurbishment and new-build where a standard (basic) level of thermal insulation is required. Knauf Insulating Laminate 22mm..
  • Board Coverage: 2.88m2
  • Polystyrene with Knauf Wallboard
  • Thermal Conductivity: 0.038 W/mK
  • Plasterboard - Tapered Edge profile (T.E)
  • EPS Insulation bonded to 9.5mm Plasterboard
£ 39.38
Ex Tax:£ 32.82
Estimated delivery: 2-3 working days
Brand: Knauf® Model: 25mm RS45 Black Foil Faced x2 Sides
25mm Black Foil Faced Two Sides Knauf RS45 Slab is a semi rigid rock mineral wool black foil backed on both sides insulation slab with an excellent class A1 fire performance. Knauf RS45 Black foil backed on both sides slab provides outstanding fire, thermal and acoustic performance for both new b..
  • 25mm Black Foil Faced x2 Sides Knauf RS45 Insulation Slab A1 Class
  • Class ‘O’ to the Building Regulations and Class A1 fire performance
  • Density of 45kg/m3 with an excellent thermal and acoustic properties
  • Provides from 30 up to 240 minutes of fire protection (x2 Foil Faced RS45)
  • Double Sides Black Foil Faced Slab accumulates heat on one side of the slab
£ 624.00
Ex Tax:£ 520.00
Estimated delivery: 5-7 working days
Brand: Knauf® Model: 25mm RS60 Black Foil Faced x2 Sides
25mm Knauf RS60 Black Foil Backed Two Sides Slab is an insulation solution specially designed for concrete soffits, an A1 class non-combustible rock mineral wool slab. Black foil backed and faced 60kg density insulation slab is less visible than the silver foil which is handy specially during the..
  • 25mm Black Foil Faced x2 Sides Knauf RS60 Insulation Slab A1 Class
  • Class ‘O’ to the Building Regulations and Class A1 fire performance
  • Density of 60kg/m3 with an excellent thermal and acoustic properties
  • Provides from 30 up to 240 minutes of fire protection (x2 Foil Faced RS60)
  • Double Sides Black Foil Faced Slab accumulates heat on one side of the slab
£ 399.00
Ex Tax:£ 332.50
Estimated delivery: 5-7 working days
Brand: Knauf® Model: 25mm RS45 Black Foil Faced x1
25mm Black Foil Faced Knauf Rocksilk RS45 Insulation Slab is a non-combustible rock mineral wool black foil backed insulation slab with an excellent class A1 fire performance. Knauf RS45 1200mm x 600mm x 25mm black foil backed slab provides outstanding fire, thermal and acoustic performance for b..
  • 25mm Black Foil Faced Knauf Rocksilk RS45 Insulation Slab A1 Class
  • Class ‘O’ to the Building Regulations and Class A1 fire performance
  • Density of 45kg/m3 with an excellent thermal and acoustic properties
  • Provides from 30 up to 240 minutes of fire protection (Foil Faced RS45)
  • Black Foil Faced Insulation Slab accumulates heat on one side of the board
£ 527.88
Ex Tax:£ 439.90
Estimated delivery: 5-7 working days
Brand: Knauf® Model: 25mm RS60 Black Foil Faced x1
25mm Aluminium Black Foil Backed Knauf RS60 60kg Slab is a rigid class A1 non-combustible rock mineral wool insulation slab faced with a reinforced black aluminium foil. The black aluminium foil faced insulation slab accumulates heat on one side of the board, unlike the aluminium silver foil that..
  • 25mm Black Foil Faced Knauf Rocksilk RS60 Insulation Slab A1 Class
  • Class ‘O’ to the Building Regulations and Class A1 fire performance
  • Density of 60kg/m3 with an excellent thermal and acoustic properties
  • Provides from 30 up to 240 minutes of fire protection (Foil Faced RS60)
  • Black Foil Faced Insulation Slab accumulates heat on one side of the board
£ 389.88
Ex Tax:£ 324.90
Estimated delivery: 5-7 working days
Brand: Knauf® Model: 25mm Two Foil Faced RS45
25mm Foil Faced on Both Sides Rocksilk RS45 Knauf Fire Insulation Slab is a standard density (45kg/m3) non-combustible rock mineral wool two-sided foil-faced slab with a great fire performance (Class A1) suitable for use in multiple applications. Knauf RS45 1200mm x 600mm x 25mm double sided alum..
  • FOIL FACED BOTH SIDES Slab - FFx2
  • Class ‘O’ to the Building Regulations - Euroclass A1
  • Density: 45kg/m3 - Excellent thermal and acoustic properties
  • Class 1 Surface Spread of Flame - Non-combustible - Odourless, Rot Proof, Non-Hygroscopic
  • Durability: do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.
£ 750.60
Ex Tax:£ 625.50
Estimated delivery: 5-7 working days
Brand: EcoTherm® Model: 25mm EcoTherm
25mm EcoTherm EcoVersal PIR Insulation Board 5 in 1 Solution is a universal multi-purpose fibre free rigid polyisocyanurate insulation core faced with an aluminium foil composite on both sides designed for insulating pitched roofs, floors, walls, ceilings and dormer cheeks. Ecotherm Eco-Versal 24..
  • Size: 2400mm x 1200mm
  • Board covarage: 2.88m2
  • Thermal Conductivity: 0.022 W/mk
  • Surface spread of flame: Class 1
  • BBA Agrément Certificate No 99/3569
£ 53.30
Ex Tax:£ 44.42
Estimated delivery: 3-5 working days
Brand: Knauf® Model: 25mm Foil Faced RS100
25mm Foil Faced Rocksilk RS100 Knauf Insulation Slab is a high-density (100kg/m3) non-combustible rock mineral wool foil backed rigid insulation slab with a great fire performance classified as Euroclass A1, suitable for use in multiple applications. Knauf RS100 1200mm x 600mm aluminium foil slab..
  • FOIL FACED Slab - Odourless, Rot Proof, Non-Hygroscopic
  • Class ‘O’ to the Building Regulations - Euroclass A1
  • Density: 100kg/m3 Excellent thermal and acoustic properties
  • Class 1 Surface Spread of Flame - Non-combustible
  • Fire, thermal and acoustic performance.
£ 404.63
Ex Tax:£ 337.19
Estimated delivery: 7-10 working days
Brand: Knauf® Model: 25mm Foil Faced RS45
25mm Foil Faced Rocksilk RS45 Knauf Insulation Slab is a standard density (45kg/m3) non-combustible rock mineral wool foil backed building slab with a great fire performance classified as Euroclass A1, suitable for use in multiple applications. Knauf RS45 1200mm x 600mm foil backed slab provides ..
  • FOIL FACED Slab - Odourless, Rot Proof, Non-Hygroscopic
  • Class ‘O’ to the Building Regulations - Euroclass A1
  • Density: 45kg/m3 - Excellent thermal and acoustic properties
  • Class 1 Surface Spread of Flame - Non-combustible
  • Durability: do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.
£ 498.44
Ex Tax:£ 415.37
Estimated delivery: 5-7 working days
Brand: Knauf® Model: 25mm Foil Faced RS60
25mm Foil Faced Rocksilk RS60 Knauf Insulation Slab is a medium density (60kg/m3) non-combustible rock mineral wool foil backed building slab with a great fire performance classified as Euroclass A1, suitable for use in multiple applications. Knauf RS60 1200mm x 600mm aluminium foil insulation sl..
  • FOIL FACED Slab - Odourless, Rot Proof, Non-Hygroscopic
  • Class ‘O’ to the Building Regulations - Euroclass A1
  • Density: 60kg/m3 - Excellent thermal and acoustic properties
  • Class 1 Surface Spread of Flame - Non-combustible
  • Non-combustible foil faced insulation slab - Multiple applications
£ 315.19
Ex Tax:£ 262.66
Estimated delivery: 7-10 working days
Brand: Knauf® Model: 25mm Two Foil Faced RS100
25mm Foil Faced on Both Sides Rocksilk RS100 Knauf Insulation Slab is a high-density (100kg/m3) non-combustible rock mineral wool foil-faced two-sides rigid insulation slab with a great fire performance (Class A1) suitable for use in multiple applications. Knauf RS100 1200mm x 600mm aluminium foi..
  • FOIL FACED BOTH SIDES Slab - FFx2
  • Class ‘0’ to the Building Regulations Euroclass A1
  • Density: 100kg/m3 Excellent thermal and acoustic properties
  • Class 1 Surface Spread of Flame Non-combustible
  • Provides excellent fire, thermal and acoustic performance.
£ 589.85
Ex Tax:£ 491.54
Estimated delivery: 7-10 working days
Brand: Knauf® Model: 25mm Two Foil Faced RS60
25mm Foil Faced on Both Sides Rocksilk RS60 Knauf Fire Insulation Slab is a medium density (60kg/m3) non-combustible rock mineral wool foil-faced two-sides slab with a great fire performance (Class A1) suitable for use in multiple applications. Knauf RS60 1200mm x 600mm aluminium foil insulation ..
  • FOIL FACED BOTH SIDES Slab - FFx2
  • Class ‘0’ to the Building Regulations - Euroclass A1
  • Density: 60kg/m3 Excellent thermal and acoustic properties
  • Class 1 Surface Spread of Flame - Non-combustible
  • Durability: will not encourage the growth of fungi, mould or bacteria.
£ 512.32
Ex Tax:£ 426.93
Estimated delivery: 7-10 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 FR/BGM
25mm Xtratherm Thin-R FR/BGM Flat Roof Insulation Board is a high-quality polyisocyanurate core (PIR) rigid insulation board with bitumen glass fibre and mineral glass facings designed for partially bonded, torched-on and built-up bituminous felt systems. Thin-R Xtratherm FR/BGM 25mm x 600mm x 12..
  • BBA Certification No. 11/4878.
  • Built-up Bituminous Felt Systems
  • Insulation for Torched-on Systems
  • Insulation for Partially Bonded Systems
  • Mechanically Fastened or Loose Laid Ballasted Bituminous Systems
£ 283.70
Ex Tax:£ 236.42
Estimated delivery: 3-5 working days
Brand: Xtratherm® Model: 25mm FR/MG
25mm Xtratherm Thin-R FR/MG Flat Roof Insulation is a high-quality polyisocyanurate foam core (PIR) insulation board with mineral coated glass facers designed for use below single ply fully adhered roof membranes, single ply waterproofing systems and partially bonded built-up felt. Xtratherm Flat..
  • BBA Certification No. 11/4878.
  • Single Ply Fully Adhered Systems
  • Single Ply Waterproofing Systems
  • Partially Bonded Built-Up Felt Systems
  • Laid on Mechanically Fixed or Adhered Boards
£ 247.13
Ex Tax:£ 205.94
Estimated delivery: 3-5 working days
Brand: Kingspan® Model: 25mm K107
25mm Kingspan Kooltherm K107 Pitched Roof Insulation Board is an advanced pitched roof insulation board with certified thermal conductivity of 0.019 W/mK across all thicknesses. K107 Insulation Board is an ideal solution for insulating your roof and can be simply retrofitted when converting an at..
  • 25mm Kingspan Kooltherm K107 Pitched Roof Insulation
  • Advanced pitched roof phenolic insulation board
  • Certified thermal conductivity of 0.019 W/mK
  • Tiled or slated pitched roofs, attic floors, dormer windows
  • Used as a rafter or joist level rigid phenolic insulation board
£ 637.76
Ex Tax:£ 531.47
Estimated delivery: 5-7 working days
Brand: Knauf® Model: 25mm RS60
25mm Rocksilk RS60 (Rock Mineral Wool Slab) Knauf Insulation Building Slab is a medium density (60kg/m3) non-combustible rock mineral wool unfaced slab designed for use in multiple applications with a great fire performance classified as Euroclass A1, which is the highest fire rating for non-combust..
  • Class 1 Surface Spread of Flame - Non-combustible
  • Class ‘O’ to the Building Regulations - Euroclass A1
  • Density: 60kg/m3 - Excellent thermal and acoustic properties
  • Unfaced Slab - Odourless, Rot Proof, Non-Hygroscopic
  • Durability: will not encourage the growth of fungi, mould or bacteria.
£ 72.64
Ex Tax:£ 60.53
Estimated delivery: 7-10 working days
Brand: Recticel® Model: 25mm GP
25mm Recticel Eurothane General Purpose Insulation Board is an easy to cut and fit PIR rigid insulation board faced with a gas diffusion tight multilayer foil on both sides that is suitable for pitched roof, timber and steel framed walls, ceilings and floor applications. Recticel Eurothane GP 240..
  • Size: 2400mm x 1200mm
  • Board covarage: 2.88m2
  • Thermal Conductivity: 0.022 W/mk
  • Surface spread of flame: Class 1
  • BBA Certificate no. 02/3905
£ 49.15
Ex Tax:£ 40.96
Estimated delivery: 2-3 working days
Brand: Knauf® Model: 25mm Rocksilk RS100
25mm Rocksilk RS100 Knauf (Rock Mineral Wool) Insulation Building Slab is a high-density (100kg/m3) non-combustible rock mineral wool unfaced rigid slab designed for use in multiple applications with a great fire performance classified as Euroclass A1, which is the highest fire rating for non-combus..
  • Class 1 Surface Spread of Flame - Non-combustible
  • Class ‘0’ to the Building Regulations - Euroclass A1
  • Density: 100kg/m3 Excellent thermal and acoustic properties
  • Unfaced Slab - Odourless, Rot Proof, Non-Hygroscopic
  • Rigid Non-combustible Unfaced Fire Rated A1 Insulation Slab
£ 87.38
Ex Tax:£ 72.82
Estimated delivery: 7-10 working days
Brand: Knauf® Model: 25mm Rocksilk RS45
25mm Rocksilk RS45 Knauf Rock Mineral Wool Insulation Slab is a standard density (45kg/m3) non-combustible rock mineral wool building slab designed for use in multiple applications with a great fire performance classified as Euroclass A1, which is the highest fire rating for non-combustible material..
  • Class 1 Surface Spread of Flame - Non-combustible
  • Class ‘O’ to the Building Regulations - Euroclass A1
  • Density: 45kg/m3 - Excellent thermal and acoustic properties
  • Unfaced Slab - Odourless, Rot Proof, Non-Hygroscopic
  • Do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.
£ 60.49
Ex Tax:£ 50.41
Estimated delivery: 5-7 working days
Brand: Rockwool® Model: 25mm RW3
25mm Rockwool RW3 Acoustic Insulation Slab (Prorox SL930) is a robust, medium-density (60kg/m3) non-combustible resin bonded semi-rigid fire resistant insulation slab designed for use in floors, roofs at rafter level, partitions, ceilings, timber and steel frame walls. Using RW3 Insulation in cei..
  • RW3 is rated Euroclass A1 non-combustible
  • Excellent thermal, acoustic and fire performance
  • RW3 insulation slabs achieve Lambda 0.034W/mK
  • RW3 is a robust insulation solution for a range of general building applications
  • Durable insulation solution which will maintain high performance over the lifetime of the building
£ 75.46
Ex Tax:£ 62.88
Estimated delivery: 5-7 working days
Brand: Rockwool® Model: 25mm RW5
25mm Rockwool RW5 Slab Acoustic, Fire and Thermal Insulation (Prorox SL960) is a strong, high-density (100kg/m3) non-combustible resin bonded rigid fire resistant insulation slab designed for use in floors, roofs at rafter level, partitions, ceilings, timber and steel frame walls. Using Rockwool ..
  • RW5 is rated Euroclass A1 non-combustible
  • Excellent thermal, Acoustic (100kg density) and fire performance
  • Rockwool RW5 insulation slabs achieve Lambda 0.034W/mK
  • RW5 is a robust insulation solution for a range of general building applications
  • Durable insulation solution which will maintain high performance over the lifetime of the building
£ 56.69
Ex Tax:£ 47.24
Estimated delivery: 5-7 working days
Brand: Rockwool® Model: 25mm RWA45
25mm Rockwool RWA45 Acoustic Insulation Slab (Prorox SL920) is a robust, standard density (45kg/m3) non-combustible resin bonded semi-rigid fire resistant insulation slab designed for use in floors, roofs at rafter level, partitions, ceilings, steel and timber frame walls. Using RWA45 Acoustic In..
  • RWA45 is rated Euroclass A1 non-combustible
  • Excellent thermal, acoustic and fire performance
  • RWA45 insulation slabs achieve Lambda 0.035W/mK
  • RWA45 is a robust insulation solution for a range of general building applications
  • Durable insulation solution which will maintain high performance over the lifetime of the building
£ 60.56
Ex Tax:£ 50.47
Estimated delivery: 5-7 working days
Brand: Xtratherm® Model: 25mm SR/PR
25mm Xtratherm Safe-R SR/PR Pitched Roof Insulation Board is a high-class rigid phenolic foam insulation board with a low emissivity foil facings designed for pitched roofs, sloped roofs, ventilated roofs, hybrid roofs and warm roofs. Xtratherm SR/PR range is a BBA certified high-efficiency therm..
  • BBA Certification No. 10/4803
  • Thermal Conductivity: 0.021W/mK
  • Reaction to Fire Euroclass B-s1, d0
  • Reduced Thermal Bridging and Risk of Condensation
  • Lightweight and Easy to Install - Superior Performance Phenolic Insulation
£ 582.35
Ex Tax:£ 485.29
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin FR/ALU
25mm Unilin FR/ALU Thin-R Flat Roof Insulation Board comprising a rigid polyisocyanurate (PIR) insulation board with a composite gas-tight foil facings on both sides. Flat Roof Board FR/ALU is used as a thermal insulation and to create or improve falls on limited access concrete, timber or metal ..
  • 25mm Unilin FR/ALU Thin-R Flat Roof PIR Insulation Board
  • Rigid PIR Insulation Board with a gas-tight foil facings on both sides
  • Used as a thermal insulation on timber or metal flat roof decks
  • High Performance Board used in conjunction with a vapour control layer
  • Used with a single-ply mechanically fixed roof waterproofing membrane
£ 637.62
Ex Tax:£ 531.35
Estimated delivery: 5-7 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin FR/MG
25mm Unilin Flat Roof FR/MG is a high performance Polyisocyanurate with mineral coated glass facers suitable for use below single ply waterproofing systems and partially bonded built-up felt. FR/MG Insulation Board for use as a thermal insulation layer and to create or improve falls on limited ac..
  • 25mm x 600mm x 1200mm Unilin FR/MG Flat Roof Insulation Board
  • High Performance PIR Insulation Board with mineral coated glass facers
  • For concrete, timber or metal flat roof decks in domestic and non-domestic buildings
  • Used below single ply waterproofing systems and partially bonded built-up felt
  • Can be used as a cheaper alternative to Celotex and Kingspan Therma Roof Insulation
£ 155.88
Ex Tax:£ 129.90
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin SR/PR Roof
25mm Unilin SR/PR Safe-R, a rigid phenolic foam insulation board with a composite foil-facing on both sides, for use in warm pitched roofs in new and existing domestic and non-domestic buildings. Safe-R Pitched Roof Unilin SR/PR on sloped roofs (ventilated, hybrid or warm roofs) provides the most..
  • 25mm Unilin SR/PR Safe-R Phenolic Foam Pitched Roof Insulation Board
  • Rigid foam insulation board with a composite foil-facing on both sides
  • Used above or between the roof rafters reducing thermal stress and condensation risk
  • SR/PR Roofs (ventilated, hybrid, sloped or warm) provides the most efficient U-Values
  • Certified lambda (thermal conductivity) of 0.020 W/mK and Euroclass C s1 d0 fire classification
£ 779.88
Ex Tax:£ 649.90
Estimated delivery: 3-5 working days
Brand: Unilin Insulation (UK) known as Xtratherm Model: 25mm Unilin XO/PR Roof
25mm Unilin Xtroliner XO/PR is a warm roof construction board, comprising a rigid foam modified Polyisocyanurate (PIR) core with robust textured low emissivity aluminium foil facings. Using XO/PR used above or between the roof rafters ensures that the structure is kept at or near the internal env..
  • 25mm Unilin XO/PR XtroLiner Pitched Warm Roof PIR Insulation Board
  • Used above or between the rafters reducing thermal stress and condensation risk
  • Rigid foam modified Polyisocyanurate (PIR) core with textured robust facings
  • Lambda (thermal conductivity) of 0.021 W/mK and Euroclass C s2 d0 fire classification
  • Used on ventilated, hybrid or warm and sloped roofs to achieve most efficient U-values
£ 635.88
Ex Tax:£ 529.90