Celotex Cavity Wall Insulation Board

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Get the best prices on Celotex Cavity Boards here! Celotex Cavity Boards (CW4000) are a quality product made up of a rigid polyisocyanurate (PIR) core with low emissivity foil facings bonded to each side of the board.

Celotex as a brand is renowned for its quality products and reliable services and has grown to become a go-to brand for builders and contractors across the construction industry. With a range of practical products at amazing prices, we can see why! The Celotex brand offers a wide material designed to suit every insulation need including, pitched roofs, flat roofs, walls, floors, and ceilings. Other Celotex products include Thermaclass, Insulated Plasterboards, and insulation boards.

Product Information

  • Product code – CW4000
  • The boards are 450mm x 1200mm with a range of thicknesses to choose from between 40mm and 100mm.
  • The board's dimensions are designed for an easy fit when it comes to masonry wall applications.
  • The boards give a coverage of 0.54m2.
  • Celotex Cavity Wall Boards have an excellent thermal conductivity of 0.022W/mK. The low thermal conductivity reduces the thickness of insulation required to hit the target U-value.
  • Low emissivity foil facing provides improved thermal performance in sealed cavity air spaces, improving the achievable U-value.
  • With less heat escaping through the walls, your energy bills can be reduced by up to 35%.
  • Celotex cavity boards are also available in pallets.

Cavity Wall Board Size Guide

  • 40mm – Cavity Wall Board CW4040 Thermal Resistance (R-Value): 1.80m2.K/W
  • 50mm – Cavity Wall Board CW4050 Thermal Resistance (R-Value): 2.25m2.K/W
  • 60mm – Cavity Wall Board CW4060 Thermal Resistance (R-Value): 2.70m2.K/W
  • 75mm – Cavity Wall Board CW4075 Thermal Resistance (R-Value): 3.40m2.K/W
  • 85mm – Cavity Wall Board CW4085 Thermal Resistance (R-Value): 3.85m2.K/W
  • 100mm – Cavity Wall Board CW4100 Thermal Resistance (R-Value): 4.50m2.K/W

Why Choose Celotex Cavity Wall Boards?

  • Save your time! Handling, cutting, and installing is made easy with this product due to the light weight of the boards.
  • This long-lasting product will have a lifespan that lasts for as long as the building when installed correctly.
  • With a low thermal conductivity of just 0.022W/mK, less heat is allowed to pass through the walls and ceilings, keeping your heat where it should be – in your home!
  • Whilst you save money on your bills, you also create a more energy-efficient environment by reducing climate change and global warming levels by reducing heat loss.
  • Use Cavity Wall Boards in your new build, extension, refurbishment project, or to upgrade current building regulation standards.
  • The most used Cavity Board size is 100mm.

How do you cut and install Cavity wall boards?

  • Cavity wall boards can be cut by first measuring and marking the boards to size and cutting with a fine-toothed saw. They can also be cut by scoring one side of the board with a sharp blade, snapping the board over a hard edge, and scoring the other side of the board.
  • Protective gear such as gloves, masks, and goggles should be worn when cutting PIR boards to prevent irritation caused by the material fibres.
  • Please note this is a guide only. Always consult a building professional before insulating your domestic or non-domestic building. Installing the incorrect insulation materials or using an incorrect installation method can be a timely and costly mistake.
  • Partial Fill Masonry Wall Applications – Cut the boards to size if necessary. The boards should be installed between the inner and outer leaf of the structure of the building as the wall is being built. Wall ties should be installed at 600mm horizontal centres into the inner leaf of the wall. The wall should be built up in a break-bonded to the next wall tie course – 450mm above the previous row of wall ties. Another row of wall ties should be positioned at 600mm horizontal centres with extra wall ties at all jambs and openings. The next course of blockwork should then be installed to secure wall ties. The first row of insulation boards should then be installed in between the two rows of wall ties. Place the boards tight against the inner leaf and tightly butt joins together. Ensure excess mortar is wiped away as you build. Repeat until the wall is complete. Take the necessary steps when coming to the end of a wall to ensure a reliable structure.
  • See the installation video guide below:

Certifications and Safety

  • All Insulated plasterboards are CFC, HCFC and Formaldehyde Free with zero ozone depletion potential (ODP) and low global warming potential (GWP)
  • All Celotex products are manufactured under Environmental Management System – ISO 14001:2015.
  • Declaration of performance – covered by a harmonised standard: BS EN 13165:2012 + A2:2016
  • Achieves a BRE Green Guide A+ rating.
  • BBA approved – certificate 16/5343.
  • CE Marked (18.DOPCW4000-01) to BS EN 13165.
  • Behaviour in relation to fire — the plasterboard face of the product has a reaction to fire classification of Class E to BS EN 13501-1 : 2007 and its use is restricted to the below.
  • In England, Wales and Northern Ireland, the product is unrestricted in terms of proximity to a boundary and, for constructions comprising two leaves of brick or concrete each at least 75 mm thick, and with cavities closed around openings and at the top of the wall (with cavity barriers in Northern Ireland), is unrestricted in terms of height, other than those described in section 9.2. For other constructions, the product should not be used in buildings with a floor more than 18 m above the ground and cavity barriers must be provided.
  • It is not classified as non-combustible or of limited combustibility.
  • Durability — the product is durable, rot-proof and sufficiently stable to remain effective for the life of the building in which it is installed.
  • The management system of Celotex has been assessed and registered as meeting the requirements of BS EN ISO 9001: 2015 and BS EN ISO 14001: 2015 by SGS UK Ltd (Certificates GB91/504 and GB11/83526 respectively).