Green Roof Root Barrier Thickness

Of course this is not all that you might have in your roofing.

Green roof root barrier thickness.

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. The most common root barriers used are thin polyethylene sheets laid over the waterproofing membrane. Grs root barriers do not contain plasticizers which can migrate to the surface and react with roofing membranes. A separation layer sometimes known as a slip layer allows the waterproofing layer and overall structure to move independently of the green roof.

These may not be required if the waterproof membrane is certified as root resistant. Additional green roof layers. 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. 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.

Root barrier the root barrier is the system that avoids the membrane underneath from being pierced and penetrated by roots ensuring that the system can remain in top shape for as long as it possibly can without needing any adjustments or changes. Grs root barriers come in 20 mil 30 mil and 40 mil thickness depending on the application. Thicker welded root barriers will be needed for green roofs involving trees bamboo or other vigorous spreading grasses. Three thicknesses of drainage plates are available to meet the drainage and water storage requirements of almost any green roof.

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. 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. Optional item if non root resistant waterproofing used. Drainage mats nominal thickness.

Rb20 is the most common root barrier product used for extensive green roof systems. Root barrier made of high density polyethylene for extensive green roofs bitumen and polystyrol resistant without plasticize tear proof uv stabilized.