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ROOF INSULATION

ROOF INSULATION

Roof insulation is an insulation system that provides a suitable level of indoor thermal comfort and great savings on heating costs. Simply roof insulation can help you keep the heat or cold in when you need to. When a roof is not properly insulated, the rising heat might lead to melting snow on a roof, which can then lead to ice dams. Currently, the recommended R-value for attic insulation is between 6.1 and 7, a combination of thickness and thermal conductivity. Roof insulation is qualified for government grants. Roof insulation grants are available to completely cover the cost of having insulation professionally installed by installers. If you are in receipt of a qualifying benefit, you should be entitled to a 100% free grant that does not need to be paid back. 

TYPES OF ROOF INSULATION

Depending on the available space, your budget and the presence of a roofing underlay, you can choose between 5 types of roof insulation.
 

1. PIR ROOF INSULATION BOARDS
 

corner of pir rigid insulation boardPIR insulation boards are the best choice when you want to use the space beneath the roof as efficiently as possible. The major advantage of PIR compared to other insulation materials is the insulation value. The Lambda value of PIR is situated between 0.021 to 0.032 W/mK. This means that PIR offers superior insulation with the same thickness. PIR or POLYISO boards can directly contribute to strategies for conserving energy and significantly reduce the effects of global warming. They have a high thermal conductivity of 0.022 W/mk and are one of the most capable and valuable roof heat resistant materials used in UK roof constructions. The "rigid" part of the name comes from the fact that unlike other forms of insulation, it doesn't come loose and compress after installation. Instead it's a solid, hard foam material. PIR insulation board is often associated with market leader Celotex company as they began producing rigid polyisocyanurate foam as first. In fact, Celotex invented the thinnest thickness of PIR insulation measuring only 12mm. Many PIR insulation brands, such as Celotex, Xtratherm, Kingspan or Recticel come with a grid marked on, which can act as a guide to help ensure the thermal insulation board is cut in a straight line for rafters. Rigid panels are designed to cover all general needs for thermal insulation, fire resistance and sound reduction and because of their versatility and high compressive strength 120kPa, PIR boards are often used in roofing jobs. PIR insulation turned out to be so good and practical that many people choose to buy a bit cheaper seconds PIR boards which, despite the fact that they were transported and stored, are highly durable and good quality products that they can be used second time on 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. Thinner insulation boards, ranging from 12mm to 50mm are offered by Celotex, Xtratherm, IKO Enertherm, Ecotherm and Kingspan. It is ideal for in-between and under rafters in a pitched roof. For more information on how to cut PIR insulation click hereIf you can't install cold loft insulation because, for example, you're using your loft as a living space, you will need to consider warm loft insulation. For a warm loft, you install insulation directly under the roof in the plane of the roof's pitch. Insulation will reduce heat loss and your loft space won't become excessively hot in summer or cold in winter. It's not as easy as laying rolls of insulation, but it can still be done as a DIY job if you'd rather not pay an installer. One important point to remember with a warm loft solution is the need for ventilation immediately below the roof tiles. This prevents condensation build up or water getting in through or around the tiles, which could cause the roof structure to rot. A good time to insulate a roof is when it's being replaced, although in many cases a roof that is in good condition can be retro-fitted with insulation.

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

 

2. FIBREGLASS ROOF INSULATION ROLL

roll of yellow fibreglass roof insulationFibreglass insulation called 'loft board' or 'loft roll' is essentially an insulating material that is built into your roof usually between or above the rafters. Glass wool is one of the most popular insulation used to insulate roofs. The first layer is laid between the joists – the horizontal beams that make up the floor of the loft, than another layer is laid at right angles to cover the joists and make the insulation up to the required depth. Fibreglass roof insulation roll is probably the most common, dirt cheap and non-combustible type of insulation used to insulate roof, however it’s itchy and gets everywhere with very little effort. If the insulation gets wet, you will need to replace it a soon as possible. To get decent thermal performance, you need a lot of insulation rolls which can quickly eat into your loft space. Roof insulation roll is the cheapest and most favored option for most common types of roof jobs and it is easy to fit between joists, which means it’s commonly used by DIYers wanting to insulate their roofs correctly in the most cost effective way possible. Blanket insulation is also the one that’s best used in conjunction with flagship Loft Legs, in order to create a solid and stable surface above the government recommended depth of insulation. The best cost effective type of roof insulation is definitely the mineral or glass wool roll. 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 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. Being lightweight, it has a good thermal conductivity of 0.044 W/mK. If you are planning to renew over 25% of your roof space, you must also ensure that your loft insulation meets the minimum values of the regulations. According to current building regulations recommended thickness for loft insulation should be at least 270mm. 

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

 

3. ROCK WOOL ROOF INSULATION

corner of rock wool roof insulation slabRock 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. In England, the required minimum U-value for pitched roofs insulated at rafter level is 0.18 W/m²K or lower. This equates to a 175mm of slab insulation. Rock wool roof insulation slabs are generally added under a vapour control layer, which reduces the risk of mould and condensation forming. 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 roof applications. The cost of insulating a roof will depend on whether you are going to do the work yourself or hire a professional to do it for you. By fitting insulation slabs yourself you can save a fortune. As of 2022 most popular insulation slab 150mm Rocksilk RS45 Knauf cost £36.36 per m2. Average size roof in the UK measures 70m2. Taking this into consideration you would be paying around £2545 for materials only. If you decide to do everything yourself, there's no need to worry about the cheapest loft board as you saved money already on labour costs. One thing to remember if you do this yourself is that you should leave a gap between the insulation and the roof slats. This is to ensure that there is enough ventilation to prevent any build-up of condensation and moisture.
Generally speaking, kg/m³ is the weight of the rock wool slabs if they were manufactured in a block of one metre cube (1m x 1m x 1m). In order for them to be identified, they are given a density rating which refers to the weight of a metre cube, displayed as kg/m³. Roof rock wool insulation is available in a variety of densities which range from 45kg up to 100kg per slab. The greater the mass is, the harder it is to vibrate this material, thus the better the insulating property will be. Therefore, it is better to choose dense and heavy material.

45kg/m³ insulation slabs are the low level insulation density slabs available from Rockwool. Although, those slabs still have higher density than other forms of insulation unlike thermal insulation which is lower in density and supplied in rolls. Rockwool RWA45 is named after its density properties in that it has a density of 45kg per cubic meter. The 45kg range slabs include the following readily available product thicknesses: 25mm ǀ 30mm ǀ 40mm ǀ 50mm ǀ 60mm ǀ 75mm ǀ 90mm ǀ 100mm 

60kg/m³ roof acoustic insulation slabs are the middle level insulation density slabs. In fact, it is recommended to use 60kg/m³ slabs as they offer the best insulation value for the money spent. Rockwool RW3 or Knauf RS60 is named after its density properties in that it has a density of 60kg per cubic meter. The 60kg/m³ density slabs are ideal either for loft floors or ceilings to control home acoustics. 60kg density slabs can be supplied either in standard unfaced 1200mm x 600mm size or foil backed on both sides. Unlike unfaced slabs, foils faced boards offer great fire performance classified as Euroclass A1. 60kg range slabs include the following thicknesses:
25mm ǀ 30mm ǀ 40mm ǀ 50mm ǀ 60mm ǀ 75mm ǀ 90mm ǀ 100mm 

100kg/m³ roof acoustic insulation slabs are the high level insulation density slabs available from Rockwool. In fact, it is recommended to use 100kg/m³ slabs in places such as hospitals, auditoriums, stadium acoustics, commercial spaces and doctor offices. Rockwool RWA5 slabs are great examples of high density slabs made especially for commercial and industrial loft spaces.

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 ROOF INSULATION

corner of phenolic roof insulation boardPhenolic roof insulation boards are the most productive type of rigid phenolic core, foil-composite insulation presently accessible for use in domestic buildings of new and existing warm pitched roof constructions where the ceiling follows the pitch of the roof and encloses a habitable space. The product is also 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. The product has a declared thermal conductivity λ value ranging from 0.018 to 0.021WmK and is light to handle and can be cut easily. However, care must be taken to prevent damage, particularly edge damage. 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. 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.

Phenolic insulation boards are lightweight but strong thermosetting plastics and are considered to be one of the best rigid, closed-cell structure materials for thermal insulation at present being up to 50% more effective than other common insulation materials such as PIR. As they’re closed cells they shouldn’t absorb moisture or water vapour, unlike open cell products. Phenolic insulation achieves a lambda value of just 0.018 W/mK across all thicknesses. High density boards have a good compressive strength and highest fire rating among many organic insulation materials. It can, in an appropriate form, achieve all the European fire certifications - UK Class O and Dutch NEN 6065/6066 Class 1. Generally speaking, the board is fire-resistant, flame-retardant, non-combustible in case of open flame, smoke-free, non-toxic, and non-dropping. In fact, phenolic foam used as composite panels can achieve up to 2 hours fire resistance rating in the 3m furnace test. The fire performance of phenolic foam is exceptional. It combines zero or very low flame spread with negligible smoke emission and a very low level of toxic gas emission. However roof phenolic boards do tend to be more expensive but on other hand offer the thinnest insulation boards for a given specific u-value. 

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

 

5. SPRAY FOAM ROOF INSULATION


man is spraying insulationIf your loft is hard to access, you can have blown insulation installed by a professional, who will use specialist equipment to blow appropriate insulation material into any awkward space. They may use mineral wool fibre, treated cellulose or polyurethane foam. Equipment used includes a hose and specialist tank to mix the material with air, in order to propel it into the loft. Coverage is generally great with blown insulation, and it’s far more effective at reaching and covering every little nook and cranny, than traditional rolls of fibreglass. In terms of effectiveness, blown insulation typically has an R-value of around 3-4 per inch. This is the measure of its ability to resist heat loss, and is better than traditional fibreglass rolls.

Cost: £39.50/m² (ex VAT) 100mm, £41.80/m² installation
Disadvantages: much harder to convert your loft into an extra room, difficult to manage and maintain in the future if any settlement occurs, you won’t be able to see the roof joists


ROOF INSULATION COST | PRICES

The amount of money you spend on 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 roof insulation would be fibreglass (glass wool). For sure, PIR insulation is also a cost-effective building material that will pay for itself over time. Boards are simply a better solution, enabling greater savings and better thermal insulation than standard mineral wool. The price of PIR insulation often depends on two factors. The first is the brand itself. When buying well-known brands, we often pay for the name itself. The second factor is the supplier location ('near me'). When buying PIR from local building merchants such as Wickes, B&Q we pay for 'off the shelf product', we can touch and see physically, while with an online supplier like us you can only get better deals without seeing a product. It is because products come to you directly from the manufacturer. In terms of m2 coverage cost 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. Spray Foam - £39.50/m²
  5. 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. Spray Foam - Thermal Conductivity of between 0.022 and 0.035W/mK
  3. PIR Rigid Insulation Boards - Thermal Conductivity of 0.022W/mK
  4. Rock wool Insulation - Thermal Conductivity of 0.035W/mK
  5. Fibreglass Insulation - Thermal Conductivity of 0.044W/mK

 

WHAT IS THE BEST FORM OF ROOF INSULATION?

Firm boards such as PIR or Rockwool RWA45 are the best solution for insulating the underside of your roof. One of our most popular best seller is the Celotex GA4000 general-purpose insulation board. It’s suitable for a wide range of applications including flat or pitched roof insulation. Light, tough, and easy to cut to size with a plasterboard saw they’re easy to install even in a small loft space. Another popular option is Rockwool RWA45 insulation slab, which have been used in pitched roofs for many years. The simplest and cheapest roof insulation is the classic fibreglass loft option. This is often just called loft insulation. It's fairly easy to do as a DIY project.

ROOF INSULATION BETWEEN RAFTERS

Insulation between rafters is the most frequently used method in the UK. It does not take up space when the loft is converted to a room. The best roof insulation for insulating rafters is definitely PIR (Celotex) and Phenolic board. Those boards do tend to be more expensive but on other hand offer the thinnest possible insulation for a given specific roof U-value. 

 

Related articles:

Best loft roll insulation

Spray foam insulation – is it really that good?

Debunking the top 3 myths about vapour barriers and foam rigid insulation

How to work out how many square metres of insulation I would need?

Cheaper alternative/equivalent to Kingspan insulation

7 easy tips for installing foil faced insulation the right way

2 Insulated plydeck compared

How to choose the right Kingspan insulation board for construction?

 

 

 

 

  

 

 

 

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 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: 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: Fermacell® Model: 10mm Firepanel A1 Fermacell
10mm Fermacell Firepanel is a homogeneous fibre-reinforced gypsum based dry lining fire protection board reinforced with non-flammable fibres for superior fire protection. Firepanel A1 is a new dimension in fire protection for dry linings, an innovative development of the original Fermacell Gyps..
  • 10mm Fermacell Firepanel Class A1 Non Combustible Fire Protection Board
  • Homogeneous fibre-reinforced gypsum based dry lining fire protection board
  • Firepanel is reinforced with non-flammable fibres for superior fire protection
  • Fully complies with construction building materials class A1 non-combustible
  • Firepanel partition system to EN 1364-1 provides 60 minutes fire rated lining
£ 107.03
Ex Tax:£ 89.19
Estimated delivery: 5-7 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: Knauf® Model: 12.5mm Vapour-Panel
12.5mm Knauf Vapour Panel Foil Backed Plasterboard is a strong vapour check laminated plasterboard with a metallised polyester foil laminate on the grey colour paper back for lining external walls and roofs. Foil Backed Plasterboard is a combination of standard wallboard and laminate with metalli..
  • Vapour Shield
  • Vapour Check
  • Vapour Barrier
  • Metallised Polyester Foil Laminate
  • Plasterboard with a Grey-Ivory Paper Face
£ 26.70
Ex Tax:£ 22.25
Estimated delivery: 2-3 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: Fillcrete Model: 12mm Fillaboard
12mm Fillcrete Fillaboard 8x4 Sheet is a special type of bitumen impregnated fibreboard used for concrete expansion, movement joints and as a general purpose expansion joint filler to reduce the risk of cracking. FILLABOARD is an ideal solution for use in expansion joints for concrete in such app..
  • 12mm Fillcrete Fillaboard 8x4 Sheet 2440mm x 1220mm - 2.98m²
  • Bitumen impregnated fibre-board used for concrete expansion
  • General purpose expansion joint filler to reduce the risk of cracking
  • FILLABOARD meets the requirements of the British Specification 033
  • Highly resistant to moisture penetration and ice formation in joints
£ 42.14
Ex Tax:£ 35.12
Estimated delivery: 2-3 working days
Brand: Fillcrete Model: 12x100mm Fillerboard Strips
Euro Accessories Fillerboard Expansion Joint Strip 12mm x 100mm x 2440mm is a multi purpose bituminous wood fibre strip used as an expansion joint filler for concrete slab and wall construction to reduce the risk of cracking. 12mm thick by 100mm wide Fillerboard Jointing Strips packed in 20 str..
  • Euro Accessories Fillerboard Expansion Joint Strip 12x100x2440mm
  • 12mm thick 100mm wide Wood Fibre Fillerboard Strips (pack of 20)
  • Highly resistant to moisture penetration and ice formation in joints
  • Required to relieve stress and reduce the risk of cracking in a concrete
  • Multi purpose bituminous wood fibre strip used as an expansion joint filler
£ 103.99
Ex Tax:£ 86.66
Estimated delivery: 2-3 working days
Brand: Various Model: 135mm Helical
135mm Helical Flat Roof Nail Warm Roof Fixing is a high performance, self-tapping, zinc plated nail designed for a quick installation and securing structural 6mm Plywood or 9mm OSB composite insulation panels. Helical Warm Roof Nails are a quick and reliable fixing method for energy efficient war..
  • Diameter: 8mm
  • Improved thermal bridging
  • Minimal compression of insulation
  • approx. 15-20 fixings per 1200x2400mm board
  • Suitable: from 49mm to 95mm Insulation Panels
£ 43.18
Ex Tax:£ 35.98
Estimated delivery: 2-3 working days
Brand: Novia® Model: 15mm Butyl Tape
15mm Novia Double-Sided Butyl Tape is a high-quality sealing tape designed for Vapour Control Layer (VCL) installation. This 22.5m long polyisobutylene based tape is economical and non-toxic solution. Butyl tape is easy to install, tools are not required for application. For use in applicat..
  • Vital for airtight installations
  • Very good adhesion properties
  • for Vapour Control Layer installation
  • Use in conjunction with Novia Metallised BOPP tape
£ 20.46
Ex Tax:£ 17.05
Estimated delivery: 2-3 working days
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 Thermafloor TF70
20mm Kingspan ThermaFloor TF70 Floor Board is a fibre-free rigid thermoset foam insulation board used to insulate solid concrete, suspended ground floors and for use with underfloor heating systems. Thermafloor TF70 Kingspan is a high performance flooring insulation suitable for use below the scr..
  • Thermal conductivity of 0.022 W/mK
  • Easy to handle and install
  • BBA Certificate 14/5133
  • NSAI Agrément Certificate 03/0196
  • INSULATION FOR SOLID CONCRETE AND SUSPENDED GROUND FLOORS
£ 46.19
Ex Tax:£ 38.49
Estimated delivery: 3-5 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: Fillcrete Model: 20x100mm Fillerboard Strips
20mm Wood Fibre Fillerboard Strip (100x2400mm) is a specially formulated bituminous wood fibre strip used as an expansion joint filler for concrete slab and wall construction to reduce the risk of cracking. 20x100mm Fillerboard Jointing Strips packed in 12 strips per pack are highly resistant to ..
  • 20x100x2440mm Fillerboard Expansion Joint Strip Euro Accessories
  • 20mm thick 100mm wide Wood Fibre Fillerboard Strips (pack of 12)
  • Highly resistant to moisture penetration and ice formation in joints
  • Required to relieve stress and reduce the risk of cracking in a concrete
  • Multi purpose bituminous wood fibre strip used as an expansion joint filler
£ 93.58
Ex Tax:£ 77.98
Estimated delivery: 2-3 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