Menu
Menu
Your Cart

90mm Celotex Thermaclass Cavity Wall 21 - Rigid PIR Full Fill Cavity Insulation Board (pack of 6)

90mm Celotex Thermaclass Cavity Wall 21 - Rigid PIR Full Fill Cavity Insulation Board (pack of 6)
90mm Celotex Thermaclass Cavity Wall 21 - Rigid PIR Full Fill Cavity Insulation Board (pack of 6)
Price: £99.30 (£119.16 inc VAT)
Price per m2: £30.65/m2 (£36.78 inc VAT)
  • Product Code: A1-4775
  • Delivery Time: 2 - 4 days
  • Brand: Celotex
  • (Tech. support: 01473820850)
  • Model and Size: 1190x450mm - 3.24m2
  • Weight: 9.07kg
Our ratings on 19-09-2025:
Google My Business Reviews
4.8 out of 5
Show other thicknesses

90mm Celotex Thermaclass Cavity Wall 21 - Rigid PIR Full Fill Cavity Insulation Board (pack of 6)

Width: 450mm
Length: 1190mm
Pack Quantity: 6
Weight/m2: 2.8kg
Weight: 9.07kg
Thermal Conductivity: 0.021W/mK
R-Value: 4.25m2K/W
Fire Rating (Reaction to Fire): E

90mm Celotex Thermaclass Cavity Wall 21 is a high performance rigid PIR full fill cavity insulation board with low emissivity foil facings offering enhanced thermal performance (0.021 W/m.K) within cavity air spaces. It can be installed with up to a 10mm residual cavity or as a full fill solution with no residual cavity. Celotex Thermaclass Cavity Wall 21 is manufactured from rigid polyisocyanurate (PIR) using a blend of blowing agents that have zero ozone depletion potential (zero ODP) and low global warming potential (GWP).

APPLICATION

  • Full fill cavity insulation,
  • Can be installed with up to a 10mm residual cavity

CHARACTERISTICS
  • Excellent thermal performance, 
  • Lightweight and easy to install,
  • Tongue and groove for easy installation,
  • The boards are sized to fit standard cavity wall tie spacing,
  • Can be used up to 18 metres height (England and Wales),
  • Includes low emissivity foil facings giving improved thermal insulation performance within cavity air spaces,
  • Has excellent dimensional stability,
  • Provides reliable long term energy savings for buildings.
CERTIFICATION
  • BBA certified, 
  • Euroclass E Reaction to Fire classification, according to BS EN 13501-1,
  • Manufactured under Environmental Management System ISO 14001:2015,
Brand: Iko Model and Size: 1200mm x 2400mm - 11.52m2
Delivery Time: 2 - 3 working days
90mm IKO Enertherm ALU PIR Rigid Insulation Board is a versatile insulation board with a rigid polyisocyanurate (PIR) foam core, clad on both sides with reflective aluminium. The seven-layer gas-tight aluminium lamination enhances resistance to fire and water ingress. It’s made without CFC, HCFC, o..
Get Best Price
Brand: Celotex Model and Size: 1200x2400mm - 46.08m2
Delivery Time: Out Of Stock
Celotex FR5025 is one of the available dimensions of the Celotex FR5000 PIR insulation boards made from polyisocyanurate rigid core and faced on both side with low emissivity aluminum foils for improved thermal performance. The product is applicable to different types of constructions incl..
Get Best Price
120mm Celotex Crown-Up Flat Roof Board - pack of 5 - pallet of 12 packs
Guide Price
Brand: Celotex Model and Size: 1200x600mm - 43.20m2
Delivery Time: Out Of Stock
120mm Celotex Crown-Up is a brand new product for use in flat roof systems. Representing the next phase of Celotex innovation, Crown-Up is a high performance rigid polyisocyanurate (PIR) insulation which delivers increased dimensional stability and added robustness in a built-up flat roofing sy..
Guide Price: £1,548.09
£1,857.71 inc VAT
Get Best Price
Brand: Celotex Model and Size: 1200x2400mm - 2.88m2
Delivery Time: 1-3 working days
Celotex TB4020 is targeted at cut-to-fit applications between rafters or joists and enables users to achieve lower U-values with a single layer of insulation than has previously been possible. TB4012 is also appropriate for use in floors and walls. With low emissivity foil facings, TB4012 is manufac..
£33.75
£40.50 inc VAT
Add to Cart
Brand: Celotex Model and Size: 2400x1200mm - 2.88m2
Delivery Time: 1-3 working days
65mm Celotex GA4065 is a multi-purpose insulation board that provides a solution to overcome localized thermal bridges. Featuring a low emissivity foil facings, this board has been manufactured from tough polyisocyanurate (PIR) using a perfect mix of certain blowing agents which have zero ozone depl..
Get Best Price
60mm Celotex GS5060 PIR Insulation Board with 9.5mm Plasterboard (pack of 16)
Guide Price
Brand: Celotex Model and Size: Celotex GS5060 - 46.08m2
Delivery Time: 1 - 5 working days
Celotex GS5060 is a premium performance PIR insulation board faced with low emissivity aluminum foils on both sides and bonded to 9.5 mm tapered edge plasterboard, providing an insulation product and a plasterboard in one. The product is designed for mechanically fixed applicatio..
Guide Price: £1,651.33
£1,981.60 inc VAT
Get Best Price
Brand: Celotex Model and Size: 1200x2400 - 34.56m2
Delivery Time: 3 - 5 days
100mm Celotex TA4000 PIR Insulation Board (pack of 12) Size: 1200mm x 2400mm Area per pack: 34.56m2 Thermal conductivity: 0.022 W/Mk R-Value: 4.50m2K/W Compressive strength: ≥150kPa Water vapour resistance: >150 MNs/g Weight: 3.41kg/m2   Celotex TA4000 pro..
Get Best Price
This product is listed in the following categories and systems (click to show).