Platon DE 25 sheets are intended to be used as a drainage layer on low-slope green roofs with an inclination of 1:10 or milder. The sheets store irrigation water in integrated chambers linked together via overflow channels. The extensive drainage layer formed below the sheets provides high drainage for excess water. Platon DE 25 sheets discharge the stored water over a long period of time, ensuring optimal distribution of water to the roots of the vegetation.

  • Stores and drains water
  • Decreases the need for watering during dry periods
  • Removes excess water efficiently
  • Light and low structure
  • Efficient protection for the waterproofing


NOTE! This product will be remonved from our selection, please chech availability!


The structure below the sheet must always include waterproofing and root barrier provided by, for example, Kerabit modified bitumen membranes with a layer of Kerabit Root Prevention Membrane on top. In inverted structures, Platon DE 25 is installed on top of thermal insulation, such as XPS. 

Manufacturer / Manufactured for Isola AS, Norway
Country of origin Norway
Conformity marking CE
Production material HDPE
Structural height 23 mm
Nominal thickness 1 mm
Dimensions 1,33 x 2,22 m
Nominal weight 950 g/m²
Colours black
Water reservoir 6,1 l/m²
Water flow capacity 9 l/ms (EN 12958)
Drainage capacity 1.5 l/sm between studs at 3% slope, gaps (permeability) 0.8 l/sm²
Other considerations for roofs with inclination of 1:10 or milder

The sheets are installed with one overlapping row of chambers so that the drainage outlets remain in line with the direction of water flow (at an angle to the direction of the slope) with the bottoms of the studs down. A filter fabric, e.g. N2/KL2, is installed on top of the sheet as a separation and filtering layer. If necessary, a filter fabric is also installed below the sheet to protect the waterproofing or thermal insulation in case of inverted structures.

Installation should be carried out in calm weather to allow safe lifting of the materials without lighter materials being blown down the roof by the wind. The sheets should be covered with filter fabric and substrate as soon as possible.