Green Roof Drainage Board
Green roof drainage board is the backbone of any green roof system. It retains and stores water during rainy days, preventing plants from becoming dehydrated and decreasing the amount of runoff into storm drains.
It also protects the waterproof membrane and provides a cushion against point loads. It is ideal for extensive and intensive green roofs.
High-density polyethylene (HDPE)
High-density polyethylene (HDPE) is a versatile plastic that is able to handle a variety of applications. It can be used in green roofs, foundation drainage systems, and for waterproofing membranes. The material is very durable and has excellent chemical resistance. HDPE is also easy to maintain. It can be easily welded together and requires no special care. It is also one of the most eco-friendly materials available.
HDPE is a type of plastic that has a low branching structure and can be formed by reacting ethylene with hydrocarbons. The polymer can be manufactured using Ziegler-Natta catalysts, Green roof drainage board chromium/silica catalysts, and metallocene catalysts. The polymer is produced by adding ethylene to a reaction mixture and stirring it until the resulting molten mass forms into a semi-crystalline substance. It is then cooled to solidify the substance.
The Green Roof Drainage Board is a lightweight, durable drainage mat for green roofs and rooftop gardens. It is designed for intensive systems with a large water retention capacity. It has a polyethylene cover that prevents clogging and filling of the drainage course with fine particles.
The drainage board features a waffle-patterned design and a filter fleece bonded to a single side of the core. This allows for a continuous flow path, even under heavy loads. It can be cut to the desired size and is suitable for use as a separation layer between roof membranes and extruded insulation in green roofing. It is also used as a green roof base and as an underlay for pavers.
Nonwoven geotextile
Besides being a key component of green roofs, this geocomposite drainage layer collects water and transports it to the drainage system. It also provides a solid barrier to root penetration. This is especially important if the plants will be placed in the highest areas of the green roof.
The drainage mats can be affixed to the waterproofing membrane with a thermal adhesive. They should be installed significantly before the growing media layer to prevent the possibility of the substrate slipping underneath. Also, since these layers are light-weight, extra care should be taken to avoid blowing them away during construction.
In addition to providing a high water-storage capacity, nonwoven geotextiles can also act as a filter and soil separator. Depending on the needs of a particular project, these materials can be used as a single layer or in combination with other components to create an entire Green Roof System.
HYDRODUCT Green Roof Drainage Board consists of a heavy-duty preformed polypropylene drainage composite with a geotextile filter fleece bonded to it. This combination makes it a versatile solution for extensive and intensive green roofs. It is easy to install, and it can play a significant role in the success of a green roof. It is ideal for rooftop gardens requiring irrigation, and it can be used in combination with perimeter drainage systems.
Filter geotextile
Often overlooked, geotextile filter fabric plays an important role in many civil engineering and construction projects. It is designed to stabilize soil, retain porosity and protect against erosion. It is used in a variety of projects, including roadways, railroads and landfills. In addition, it can be used to stabilize slopes and bolster embankments. It can also prevent clogging of drainage systems. Geotextile filter fabrics are also used in environmental protection applications, such as in wetland restoration to help stabilize soil and mitigate the impact of waves and water currents.
There are four main types of drainage layer materials used in green roof construction. They include cuspated sheets, entanglement sheets, granular drainage material and structural drainage. Cuspated sheets are waffled plastic layers that provide water storage and drainage for the plants. These can be made of either a perforated or non-perforated material. The top side of these plates has a geotextile filter fleece to prevent clogging.
Non-woven filter fabric is a popular choice for constructing a drainage board. It is lightweight, strong and provides excellent filtration properties. It is also able to hold water and resist tensile forces. It is available in several thicknesses and weights, so it can be customized for each project. Gabion Supply carries a wide selection of non-woven needle punched geotextile fabric, from 4 oz to 16 oz.
Root holder foil
Root barrier foil is a layer that separates the green roof assembly from the roofing membrane/waterproofing. It is made from hard-wearing, moisture-resistant material and will prevent plant roots from penetrating the waterproofing membrane. It is an essential component of a green Green roof drainage board roof system that uses felt roofing, and can be added even to other types of roofing to make it root resistant. It is sold by the m2 and should be overlapped from 6-12’’. It is not a waterproofing layer. It should be installed after the nonwoven geotextile. It is not a replacement for the drain mat.
Our drainage mats, weed control fabrics, and root barriers are engineered to be compatible with green roof growing media and other components, including soil, retaining walls, and pavers.