The Breathe-R offers a 39% reduction in heat loss reduction when compared to standard traditional breather membranes all of which amount to saving you money by reducing your energy bills. Breathe-R is 2mm thick and comprises of 2 layers. Manufactured using a high performing and durable roofing membrane as the external outer layer. Breathe-R’s internal facing layer is manufactured using highly reflective insulation grade aluminium foil which is fully perforated to allow free passage of moisture from the internal to external. Breathe-R gives a overall thermal resistance value of 0.450(m2 K/W) equivalent to approximately 20mm Mineral Wool insulation.