90mm Celotex

90mm Celotex


90mm Celotex CW4000 Partial Fill Cavity Wall (5/pack)

A partial fill insulation solution for masonry cavity walls, 90mm Celotex CW4000 Partial Fill Cavity Wall (5/pack) is a rigid polyisocyanurate (PIR) insulation board with high thermal performance, suitable for use in new buildings and extensions.

Sized to fit between cavity wall ties, it is lightweight and rigid; making it easy to handle, transport, and fit on site.
As well as being CE-marked, 90mm Celotex CW4000 Partial Fill Cavity Wall (5/pack) is certified by the British Board of Agrément for cavity wall construction.

Made at our original site in Hadleigh or our state-of-the-art facility in Eggborough (opened in 2018), you can be confident of it providing reliable, long-term energy savings that help to ‘future-proof’ your building.

Thickness: 90mm (5/pack)
All Thickness: 25,40,50,55,60,70,75,85,90,100mm
Board size: 1200 x 450mm – 2.70 m2

Maximum board weight (kg/m2): 0.80
Compressive strength: CS(10\Y)120
Dimensional stability: DS (70, 90)3 – DS (-20,-)1
Thermal conductivity: 0.022 W/mK
Surface spread of flame: Class 1
Reaction to fire: E
Thermal Resistance: 1.10 (m2K/W)
Facer: Low emissivity composite aluminium foil

How does 90mm Celotex CW4000 Partial Fill Cavity Wall (5/pack) perform?


The entire thickness range offers a low thermal conductivity (lambda value) of 0.022 W/mK, putting CW4000 among the best-performing widely-available insulation materials on the market.
Celotex CW4000 will help to provide most of the thermal insulation performance in a cavity wall build up – but the overall heat loss from a building element depends on all of the materials used and the way they’re installed. Use our online and mobile U-value calculators to help you find the most efficient solution for your cavity wall

Product benefits


The low emissivity aluminium foil facing on Celotex CW4000 helps to achieve lower U-values by increasing the thermal resistance of the air cavity it faces. Check our frequently asked questions for common queries about positioning and installing products correctly, or contact our technical services team.

Like all Celotex products90mm Celotex CW4000 Partial Fill Cavity Wall (5/pack) is a thermal insulation solution that can help to meet energy use and carbon dioxide emissions targets set by national building regulations.
    -Board size: 1200 x 450mm
    -Thickness : 40-100mm
    -Lambda: 0.022 W/mK
    -Facer: Low emissivity composite aluminium foil
    -Comes in conveniently sized boards for installation between cavity wall ties
    – Is certified under BBA certificate number 16/5343
    -Includes low emissivity foil facings giving improved thermal insulation performance within cavity air spaces
    – Can be used to provide energy performance of new and existing buildings

Manufactured using a blowing agent with zero ozone depletion potential (ODP) and low global warming potential (GWP).

90mm Celotex CW4000 Partial Fill Cavity Wall (5/pack)