Field glossary

Overburden

Everything above the membrane: drainage layer, filter fabric, growing media, and plants, plus any ballast and pavers

Used across 3 Anvilfield field guides, most in Roofing.

Also defined as

Soil, plants, ballast, pavers, or insulation over the membrane; why low-voltage ELD is often the only practical test
Anything covering the membrane, soil and plants, ballast stone, pavers, or insulation in an inverted roof

Where this shows up