Thermafleece Technical Specification
Thermal Performance
Thermafleece is manufactured using state of the art techniques to produce a tightly bound random matrix of hollow wool fibres with a large internal surface area that ensures the finished insulation has excellent thermal insulating properties.
Thermafleece has a nominal density of 25 kg/m3 and a thermal conductivity of 0.038 W/mK which is better than most equivalent conventional insulation.
Acoustic Performance
The combination of fibre structure and density gives Thermafleece excellent acoustic properties and can contribute significantly to the reduction in the passage of sound in structures in line with current UK Building Regulations and Robust Details.
Tests show that the use of Thermafleece in a 100mm cavity of a timber framed wall or floor can improve the sound reduction index by approximately 6-12dB. If a sound is reduced in level by 8dB, a person would experience a halving of the original sound level.
As part of the overall sound reduction measures the use of an appropriate absorbent material such as Thermafleece to fill wall voids will make a valuable contribution towards passing required acoustic tests under the regulations.
Moisture and Temperature Control
The hygroscopic nature of wool fibres means that Thermafleece can act in sympathy with buildings to control internal moisture levels and contribute to a more stable and comfortable indoor environment.
When the wool in Thermafleece encounters moisture it is capable of releasing and absorbing heat. Wool releases heat when absorbs moisture and absorbs heat when it releases moisture which can have a stabilising influence over air temperature.
Fire Resistance
Wool has a higher fire resistance than cellulose and cellular plastic insulation; it does not burn but melts away from an ignition source and extinguishes itself. Thermafleece is treated with a low level of fireproofing agent to improve its intrinsic fire resistance and comply with BS 5803-4 (Spread of Fire) achieving results of zero for ignitability, spread of flame and heat evolved.
Technical data
