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Table 4 Mean substrate depth on nine extensive green roofs in order of increasing roof age

From: Vegetation composition of old extensive green roofs (from 1980s Germany)

Roof age grouping Roof # Roof name (in order of age at time of survey) Mean substrate depth (mm)
20–21 7 S-Rathausgaragedach, PV 75.4
  8 S-Rathausgaragedach, low 69.8
  9 Killesberg Dach 84.7
22–23 1 FH Nürtingen 72.3
  2 Römermuseum, Köngen 76.6
24–25 4 Gärtnereihof Tübingen 61.5
  5 Verkehrsbetrieb Area 1 52.8
  6 Verkehrsbetrieb Area 2 58.1
>26 yr 3 Pliensaufriedhof, Esslingen 61.6