Overburden dividers include gravel boards, edge pieces, rounded edge sections and vegetative roof system edge definers. They are used to separate overburden types, such as growth medium and pavers or growth medium and rock; they are installed over the protection course, drainage layer and filter layer and can be polyethylene (vertical piece with support stands) or stainless steel (L-shaped). Overburden dividers are not mechanically fastened but are loose-laid and ballasted and typically have drainage slots. They are installed over the protection course, drainage layer and filter layer and should be secured to avoid displacement.
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