33 41 00 Subdrainage
33 41 13.16 Geocomposite Foundation Drainage
33 41 13Foundation Drainage33 41 13.13Foundation Drainage Piping33 41 13.16Geocomposite Foundation Drainage33 41 16Subdrainage Piping33 41 16.16Geocomposite Subdrainage33 41 16.19Pipe Underdrains33 41 19Underslab Drainage33 41 19.13Underslab Drainage Piping33 41 19.16Geocomposite Underslab Drainage33 41 23Drainage Layers33 41 23.16Gravel Drainage Layers33 41 23.19Geosynthetic Drainage Layers33 41 33Retaining Wall Drainage33 41 43Synthetic-Media French Drains