expanded clay on the roof garden is a component of substrate. probe in

soil flooring wall floor wood iron asphalt brick rock art brown pattern brickwork sand geology roof tile stonewall expanded clay garden component substrate probe nop system irrigation filtration white geotextile excavation drain drops capacity retention watering pipe grid mineral button foil architecture background construction curb exterior gardening hose house insulation insurance leak leaking material removing renovation repair rooftop sidewalk sprinkler sprinkles structure surface terrace texture tube