Elements of the green roof Filtering, sperating and equalization layers 5 min read 0 853 Filtering layer – filtering veilThis is the layer which prevents transportation of substrate components deep into the protection structure and also protects waterproofing from eventual chemical deteriorations (this could be the result of the moving of organic materials and minerals from the vegetation layer and the substrate).The filtering layer must meet the following requirements: do not deteriorate the environmentnot to be degenerated by the environmentto be compatible with plants (do not produce phytotoxicity)to be waterproofroots to be able to pass throughto have resistance against microorganismsto be resistant to chemical substancesFor all these reasons, a 1-2 mm thick polyethylene cover is used, that will form a filtration layer, and prevents clogging and filling of drainage layer with fine particles. Using this polyethylene veil, 90% of the substrate is retained and only 10% will be able to penetrate the filter.This veil have to cover the entire surface of the drainage layer (in most cases drainage teils are used) and to be fixed with the vegetation substrate, which will be the next level of the extensive green garden or terrace.Bauder Filtervlies FV 125Materialpolyester/polypropyleneThickness1,0 mmWeight125 g/m²Size2,0 x 100 m1,0 x 100 mDelivery shape roll 200 m²roll 100 m²Item number7423 02007423 0100 Download product datasheetSeparating layer – Polyethylene foilThe separating layer covers the waterproofing of the roof, increasing its effectiveness. It is used a polyethylene foil which is compatible with the bitum.Bauder Trennfolie PE 02Materialpolyethylene foil made of recycled granules, compatible with bitum and polystyreneThicknessabout 0,2 mmWeightabout 190 g/m²Size 4 x 50 m (folded to 1 m width)Delivery shaperoll 200 m²Item number7444 0000Filtering layer is an important element of a green roof, prevents moving of substrate components deep into the protection structure. It also protects the waterproofing against chemical deteriorations. The separating layer is the next level over the waterproofing and it increases its effectiveness. It is actually a polyethylene foil, compatible with the bitum.Manufacturers whose materials we use for landscape works are well known all over the world. We already had some common projects, and results were reliable and spectacular. If you choose us, the quality of building elements is doubled by the qualified human professionalism. Our team is well experienced in the use and maintenance of all building elements of a green roof.We can build extensive vegetation on industrial halls, intensive green terraces on office buildings, we can also create recreation and relaxing areas, intensive green roofs for high pedestrian traffic on the top of shopping malls, and many other ecological solutions. Thanks to the competence and professionalisms of our team, all materials used are compatible. Protection, separation and filtering layers, drainage of the green roof, together with control boxes, delimitation elements, evacuation gutters are key components of a green roof system.