Press Release

A step-change improvement to the thermal performance of its triple-skin rooflights – available at no additional cost – has been launched by Brett Martin Daylight Systems.

Employing the full expertise of the main Brett Martin Group, the largest extruder of polycarbonate in Europe, the well-established manufacturing process has been developed specifically to meet the demands of the UK rooflight market using brand-new extrusion techniques.

The result is Cleartherm 2 - a 10mm quadruple-wall polycarbonate sheet that provides a U-value of 1.3W/m 2K when installed into any site-assembled profiled rooflight. Manufactured with much thinner polycarbonate skins than has previously been possible, keeping weight (and hence cost) to an absolute minimum, the glass-clear clarity of the thin skins maximises light transmission.

The new quadruple-skin product transmits as much light as the twin-skin product it replaces and, critically, it provides significantly better light transmission than any other rooflight with similar levels of thermal performance.

Variants of Cleartherm 2 are available which can provide U-values as low as 0.9W/m 2K, and all variants of Cleartherm 2 can also be fitted inside factory-assembled Multivaults and rooflights to provide Energysaver FAIRs with the same level of thermal performance.