Green Roof Drainage Plates

Drainage board is an important part of roof greening system and plays a role in storing and draining water.

Green roof drainage plates.

Grs extenduct is a 40 recycled drainage core in a waffle pattern with a geocomposite fabric bonded to the top side. Grs extenduct 2 includes an additional geocomposite fabric bonded to. Since drainage plates are lightweight and easy to install they have become the most popular drainage system for green roofs. A separation fabric over the top of the plates retains.

Water is retained within pockets on the upper sides of the plates while excess water flows through small holes and spills over the edges to be carried off the roof. 25mm 1 thickness is standard for thin extensive roofs 40mm 1 5 is recommended for enhanced water storage and drainage on thicker extensive roofs and semi intensive roofs and 60mm 2 5 is available for. Three thicknesses of drainage plates are available to meet the drainage and water storage requirements of almost any green roof. Green roof systems of this type are drained by a multi layer fabric mat called a drainage mat that combines soil separation drainage and protection functions.

Drainage plates are recommended for roofs with slopes less than 1 12. A synthetic protection water storage fabric weighing 500g m2 15 oz yd2 is applied over the waterproofing or root barrier membrane. Systems with drainage mats. Compared with green roofs systems using drainage plates or granular drainage this system is the fastest to install and creates the thinnest and lightest green roof assembly.

The filter fabric top layer prevents clogging from the growing media and the waffle entanglements sit directly on the root barrier.