PLAYFLY barrier membrane is of excellent water vapor barrier performance and also resists wind and water, suitable for all supported and unsupported pitched roofs and walls. It's laid above the foundation and below the insulation layer , which can prevent moisture penetrateing the insulation layer so as to keep the insulation layer dry. It will give the roofing and walls a better performance of waterproof, warm-keeping and energy-saving if combinating the PLAYFLY breather membrane and PLAYFLY barrier membrane.