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UKFR - Roofing & Insulation Specialists
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UKFR - Roofing & Insulation Specialists

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Industry Experts

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Finance Available

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Industry Experts

50 Years Experience

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UKFR - ROOFING AND INSULATION SPECIALISTS

Celotex PIR Insulation Boards

Improve your home’s energy efficiency with lightweight & high-performance Celotex Insulation boards. 
Celotex PIR is available in varying thicknesses and designed with low-emissivity foil facings to ensure excellent thermal performance wherever installed. Shop the range below and receive fast delivery from our UK branches 
 

Shop All Celotex PIR Insulation Boards

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UKFR - ROOFING AND INSULATION SPECIALISTS

Celotex PIR Insulation Boards

Improve your home’s energy efficiency with lightweight & high-performance Celotex Insulation boards. Celotex PIR is available in varying thicknesses and designed with low-emissivity foil facings to ensure excellent thermal performance wherever installed.Shop the range below and receive fast delivery from our UK branches. 
 

Shop All Celotex PIR Insulation Boards

 
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Featured Products

Celotex TB4000

£14.08 inc. VAT

£11.73 ex. VAT

Celotex GA4000

£21.18 inc. VAT

£17.65 ex. VAT

Celotex XR4000

£45.60 inc. VAT

£38.00 ex. VAT

Celotex XR4000 (Pallets)

£937.46 inc. VAT

£781.22 ex. VAT

Celotex Thermaclass Cavity Wall 21 90mm

£88.80 inc. VAT

£74.00 ex. VAT

Celotex PL4000 PIR Insulated Plasterboard

£42.18 inc. VAT

£35.15 ex. VAT

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Get a Quote

Planning your next project and need cost assistance. We help projects of all sizes and offer money-saving alternatives and discounts for large orders. We strive to respond within 24 hours.
 

Get a quote for your next project

 
 

Improve Thermal Performance With Celotex Insulation Boards

Celotex offers a wide range of high-performance polyisocyanurate insulation boards in varying thickness from 20mm to 200mm, making them suitable for roof, wall, floor and ceiling applications. They all feature low-emissivity foil facings and have a low thermal conductivity of 0.022 W/m.K, helping you achieve the required U-value needed in UK building regulations.

The boards share the same dimensions of 2400mm x 1200mm, only differing in thickness:

Which Celotex board do I need?

Celotex PL4000 (Celotex Insulated Plasterboard)

  • Suitable for: Roof & internal wall lining

  • Dimensions: 2400mm x 1200mm

  • Available thickness: 37.5mm, 52.5mm, 62.5mm, 72.5mm

Celotex Thermaclass Cavity Wall 21

  • Suitable for: Cavity walls

  • Dimensions: 1190mm x 450mm

  • Available thickness: 90mm

Celotex TB4000

  • Suitable for: Floor, wall & pitched roofs

  • Dimensions: 2400mm x 1200mm

  • Available thickness: 20mm, 25mm, 30mm, 40mm.
        

Celotex GA4000 (multi-purpose insulation board)

  • Suitable for: Pitched roofs, walls and floors

  • Dimensions: 2400mm x 1200mm

  • Available thickness: 50mm, 60mm, 70mm, 75mm, 80mm, 90mm, 100mm

Celotex XR4000

  • Suitable for: Floors, walls & pitched roofs

  • Dimensions: 2400mm x 1200mm

  • Available thickness: 120mm, 150mm

  • Available thickness in (bulk buy): 110mm, 120mm, 130mm, 140mm, 150mm, 165mm, 200mm

Please note this will depend on stock availability. If we currently do not have the thickness you seek in stock, please get in contact with us and a member of our team will be happy to assist.
 

Are Celotex PIR insulation boards right for me

Celotex is a game-changing brand for insulation, offering a handful of benefits whilst remaining relatively thin compared to other sources of insulation. Some of these benefits include:

 

Certified
Celotex TB4000 has been assessed by the BBA as fit for use in defined roof, wall and floor applications if installed, used and maintained as set out in the certificate. It has also achieved a BRE Green Guide Rating of A.

 
 

Excellent Thermal Performance
Thermal conductivity of 0.022W/m.K reduces required thickness for target U-value

 

High-Performance Facer
Low emissivity foil facing improves achievable U-value in sealed cavity air spaces

 

Easy Installation
They are lightweight & rigid making them easy to cut down to size, transport, handle and fit.

 

Cost-saving
Excellent thermal performance reduces your energy consumption

 

Insulation boards are designed to retain heat within the structure of your home to ultimately keep you warmer when you need it most.

Important fire rating note: Celotex PIR insulation, alongside other PIR brands, has a fire-resistance rating of Euroclass F - meaning it will combust easily when reacting to a fire. If you require fire-resistant insulation, check out our A1 classified wool insulation which includes mineral wool and fibreglass insulation.

What are Celotex PIR insulation boards used for?

Celotex insulation helps significantly reduce thermal bridging and is suitable for various building applications and construction projects including:

Pitched Roof

  • Between and Under Rafters
  • Loft Insulation
  • Between and Over Rafters
  • Between Rafters
  • Pitched Roof Sarking

 

Flat Roofs

  • Balconies and Terraces
  • Between and Under Joists

 

Internal Walls

  • Partition Walls
  • Cavity Walls
  • Basement Walls
  • Masonry Walls
  • Exterior Walls
  • Timber Frame Walls

 

Ground Floors

  • Block & Beam Floor
  • Concrete Slab Floor
  • Upgrading Concrete Slab Floors
  • Suspended Timber Floors

 

Why buy Celotex Insulation from UKFR?

UKFR is a proud and trusted UK supplier of PIR insulation boards & materials, with happy and returning customers across the country benefiting from fast nationwide delivery.

With over 50 years of experience, we’ve seen it all and are highly knowledgeable in a wide range of flat roof systems.

If you need any help with your order or have a question about a project, get in touch with us today via WhatsApp or drop us an email at sales@ukflatroofing.com.

Frequently Asked Questions

Celotex insulation boards are made from polyisocyanurate (PIR) foam and have a foil facing on each side. Created by combining polyisocyanurate resin with a blowing agent, it creates a chemical reaction, making the foam insulation. This foam is placed between two emissivity aluminium foil facings and can be cut down to size to suit a variety of building projects including roofs, walls, and underfloor heating.

All of the boards are the same PIR boards. The codes refer to the thicknesses.

  • TB4000 is 20mm to 40mm
  • GA4000 is 50mm to 100mm
  • XR4000 is 110mm to 200mm

The thickness of insulation required will depend on many factors including the U-value required, the size and shape of the building element, and the type of insulation being used. Many online calculators can help you determine the appropriate thickness for your project; alternatively, don’t hesitate to get in contact with us and we will be happy to assist.

Celotex insulation boards have a Euroclass rating of F, which is considered the worst rating in terms of combustibility. However, it’s important to note that poor Euroclass ratings do not mean the material is unsuitable for home use.

The rating simply means it will not stop the spread of fire, so using fire-resistant materials in conjunction with Celotex PIR insulation products is ideal.

Celotex can be a great alternative to Kingspan insulation products. Please note Celotex is not a flat roof board and can not be used as an alternative to flat roof insulation boards.

Yes! All insulation needs a vapour barrier which should be installed on the warm/internal side of the insulation.

R-value measures how resistant a material is to heat flow; the higher the R-value, the greater the thermal resistance of the material.

U-value measures the rate heat flows through a building element, such as a wall, floor, or roof; the lower the U-value, the more effective the building element is at preventing heat loss or gain.

Insulation boards are easy to cut down but must be done safely to avoid damage. When cutting to size, use a fine-toothed saw or sharp knife, snapping the board over a straight edge and cutting the facing on the other side.

 

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