for drainage, protection, for filtration
The VL fleeces are geotextiles made of polypropylene thread using a needle felting method.
VL geotextiles have many different uses on green roofs but their main functions are filtering and mechanical protection. VLS geotextiles are water retentive and protect too. Manufactured from a mixture of threads, without thermal treatment. Approx. weight 300 g/m2 .