Green Roof Root Barrier Thickness

Grs root barriers do not contain plasticizers which can migrate to the surface and react with roofing membranes.

Green roof root barrier thickness.

The nominal thickness of a green roof is the approximate total height of the soil and drainage components that constitute the green roof system excluding the roof structure insulation waterproofing and plants. Rb20 is the most common root barrier product used for extensive green roof systems. Additional green roof layers. It is ideal for systems that have typical green roof plants such as sedums which have shallow roots and will not present a lot of penetration pressure.

Root barrier made of high density polyethylene for extensive green roofs bitumen and polystyrol resistant without plasticize tear proof uv stabilized. Safeguard root barrier is intended to provide root protection in green roof applications where the primary waterproofing layer does not offer adequate root protection. 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 maximum water retention on intensive roofs. Epdm is fll certified for green roofs and 2 if we ensured that seams were properly sealed and we installed a root barrier an epdm roof is likely to perform well.

Safeguard root barrier is simply loose laid on top of the primary waterproofing layer before subsequent green roof layers drainage layer filtration layer etc are laid on top. Of course this is not all that you might have in your roofing. Then i looked at conflicting information on the suitability of epdm for green roof applications and determined that 1 firestone rubbergard 60 mil. Drainage mats nominal thickness.

The most common root barriers used are thin polyethylene sheets laid over the waterproofing membrane. Grs root barriers come in 20 mil 30 mil and 40 mil thickness depending on the application. The root barrier membrane is suitable as a separation layer for use in single ply green roofs intensive roofs and under domestic driveways. A separation layer sometimes known as a slip layer allows the waterproofing layer and overall structure to move independently of the green roof.

Three thicknesses of drainage plates are available to meet the drainage and water storage requirements of almost any green roof. These may not be required if the waterproof membrane is certified as root resistant.