... particles or concrete backfill. Main Technical Indicators of HDPE Green Roof Drainage SheetFeatures:1. Strong tensile strength, high ... stepping, concrete pouring impact force, etc.Typical Application:1. Green Engineering: garage roof greening, roof garden, roof garden, soccer ... 4. Traffic engineering: roads, railway subgrade, embankment and slope protection layer.Photo 1 The factory viewPhoto 2 The ...