Celotex Thermaclass Cavity Wall 21
Lower lambda value, higher performance, rigid Polyisocyanurate (PIR) full fill cavity wall insulation board.
Comes in tongue & grooved conveniently sized boards for installation between cavity wall ties.
Includes low emissivity foil facings giving improved thermal insulation performance within a 10mm residual cavity air space.
Can be installed with up to a 10mm residual cavity or as a full fill solution with no residual cavity.
Can be used to provide energy performance of new and existing buildings.
BBA certified.
Provides reliable long term energy savings for buildings.
Thicknesses and Availability:
Available in most popular thicknesses from the manufacturer; short lead-times apply as we may need to get the products in from Celotex before delivering to site.
This Thermaclass Cavity Wall 21 Range includes the following available product thicknesses: 90mm, 115mm and 140mm.
Product Information
General information about Celotex Thermaclass Cavity Wall 21
Product Application
Full fill cavity wall application insulating board
Celotex's high performance polyisocyanurate (PIR) foam board, Thermaclass Cavity Wall 21, is suitable for use in cavity wall applications with up to a 10mm residual cavity or full fill cavity with no residual cavity.
Product Make-up
Core
Celotex Thermaclass Cavity Wall 21 is manufactured from rigid polyisocyanurate (PIR) using a blowing agent that has zero ozone depletion potential (zero ODP) and low global warming potential (GWP).
Facings
Faced on both sides with a low emissivity aluminium foil, autohesively bonded to the insulation core during manufacture.
Product Properties
| Thickness | 90mm to 140mm | |
| Board Length | 1.2m | |
| Board Width | 0.45m | |
| Board Edge | Tongue & Grooved |
Product Prices
Buy Celotex Thermaclass Cavity Wall 21
Reasonable stock levels are generally held at most of our depots. In some geographic locations, depots may stock alternates, however, we will contact you to discuss before proceeding with the order.
Where products need to be brought in from Celotex, please allow approx. 1 week for delivery.
- Generally 1 or 3 working days for delivery
- Generally 1 to 5 working days for delivery
- Generally 5 to 10 working days for delivery
- Special request or made to order item, allow extended lead times. Minimum order levels may apply.
- Please call to check availability and approximate lead times
Product availability depends upon stock levels at closest depot and delivery logistics to geographic locations
Product Performance and Guides
Product Performance, Manufacturer Downloads, and Installation Guides
Product Performance
| Thermal Conductivity | 0.021 W/mK | |
| Compressive Strength | 120 kPa at 10% compression | BS EN 826:2013 |
| Vapour Resistance | > 300 MNs/gm |
| Product | Thickness | Thermal Resistance | kg/m² |
|---|---|---|---|
| Celotex Cavity Wall 21 90mm | 90mm | 4.25 m²K/W | 2.80 kg/m² |
| Celotex Cavity Wall 21 115mm | 115mm | 5.45 m²K/W | 3.55 kg/m² |
| Celotex Cavity Wall 21 140mm | 140mm | 6.65 m²K/W | 4.30 kg/m² |
Product Certificates
Please visit the Celotex website for product certificates.