Description
Cloud 9 Radiance provides a firm, high-density base in a slimmer 6mm construction. Designed for underfloor heating and heavy contract installations, it is also recommended by Ball & Young for sisal carpets. Sold by the nominal 15m² roll.
Where to use it
For heavy contract use, large areas and installations needing a flat, firm finish. Suitable for stretch-fit or double-stick installation. For underfloor heating, ask your fitter to check the combined carpet and underlay tog against the heating system requirements.
Technical specifications
- Core
- Cloud 9 APT crumb
- Thickness
- 6 mm
- Nominal roll coverage
- 15 m²
- Nominal roll dimensions
- 11 m × 1.37 m
- Top surface
- Spun bonded polypropylene
- Underside
- Corona treated polymer film
- Nominal roll weight
- 17.7 kg
- Weight per unit area
- 1175 g/m²
- Core density
- 180 kg/m³
- Finished product density
- 196 kg/m³
- Thermal resistance
- 1.3 tog (BS 4745)
- Impact sound improvement
- 31 dB (BS EN ISO 10140-3 / BS EN ISO 717-2)
- End-use classification
- HC/U – heavy contract use
- Manufacture
- United Kingdom; BS EN 14499:2015
Performance test results
- Compression work after 1,000 impacts
- >90 J/m² (BS 4098)
- Compression work retained
- >90% (BS 4098)
- Thickness loss after static loading
- <5% (BS 4939 / ISO 3416)
- Thickness loss after dynamic loading
- <5% (BS ISO 2094 R05)
- Resistance to cracking
- Pass (BS EN 14499)
Indoor air quality
- Air quality testing
- ISO 16000
- French VOC rating
- A+
- French CMR components
- Pass
- Italian CAM
- Pass
- Formaldehyde emission class
- E1
Coverage, fitting and guarantee
Measure your area and allow for cutting and fitting waste. Divide the required area by 15 and round up to a whole roll. Roll dimensions are nominal and subject to manufacturing tolerances.
The manufacturer’s guarantee covers the lifetime of the initial carpet installation when used in recommended areas. Test results describe laboratory performance; the fitted floor’s performance depends on the complete installation.
Download the manufacturer’s technical datasheet (PDF)
Issue 6, 16 July 2026
Compare Cirrus 9mm, Cumulus 11mm and Radiance 6mm, or browse all underlays.
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