Green Roof Drainage Board

While lush greenery and blooming flowers might catch the eye, the drainage layer is the unsung hero of the green roof. This layer ensures that the green roof system can capture and store water during a storm, while decreasing the volume of stormwater running into storm drains.

The drainage layer typically consists of two components. First, a separation layer and then the granular drainage/storage mat.

HDPE

HDPE (High Density Polyethylene) is a type of recycled plastic that can be used in a variety of outdoor products. It is a durable and safe material that resists salt spray, oil, moisture, fading, insects, graffiti, splinting and warping. It is also resistant to many chemicals. It is ideal for use in waste and recycling receptacles, marine products, drain pipe, food preparation products and outdoor signage.

Its uses include green roof drainage boards, nonwoven geotextiles, and root Green roof drainage board holder foil. Its great compressive strength makes it a good choice for the protection layer over the waterproof membrane of the green roof. It also helps the plants retain water.

This type of plastic is commonly found in milk jugs, detergent bottles, shampoo and conditioner bottles, some margarine and yogurt tubs, and empty motor oil, antifreeze, and other vehicle and equipment fluid containers. It is labeled with a recycle number 2 and may be natural or colored. It is often made from type 2 post-consumer plastics and is recyclable at the end of its lifecycle.

Nonwoven geotextile

A nonwoven geotextile is a durable landscape fabric that can increase soil stabilization and ground support. It is available in different weights and thicknesses to suit various applications. Heavyweight nonwovens are ideal for separating sand under volleyball courts or preventing the mixing of ballast and soil under railroad tracks. They are also highly resistant to puncturing, making them a good choice for green roofs that will be subjected to traffic or extreme weather conditions.

Nonwovens are also excellent for green roof vegetation and growing media protection. They can protect against wind scour, and help stabilize growth media on sloped roofs. In addition, they can also improve waterproofing by enhancing drainage through the green roof.

One popular product is the GRS green roof system, which combines drainage, water retention and root barrier into a single sheet. It is a dimpled drainable geocomposite with a nonwoven face that acts as a filter and a root barrier. This product can be used for commercial or residential projects. Green roofs are becoming increasingly common in cities, and many are even incorporating them into home designs. This is because they offer a number of benefits, including increased insulation and improved aesthetics.

Root holder foil

Root holder foil is a black, nonwoven mat that protects the waterproofing layer of green roofs from roots. It is used on new or existing roofs and can be inserted between the green roof soil layer and the roof membrane. It is laid by overlapping transverse and longitudinal joints. For best results, it should be overlapped by a minimum of 1.5 m.

These green roof drainage layer mats can be used for many different projects, including rooftop gardens and as a protective layer over roofing membranes. They are also ideal for use as a base layer for permeable pavers and as a soil support underneath natural turf.

A good drainage system is essential to the success of any green roof, especially on commercial buildings. To avoid over-saturating the soil, the growing medium must drain adequately and provide a continuous supply of water to the plants. A good drainage system also ensures internal aeration and prevents compaction of the soil pre-mix. For this reason, single-source engineered soil pre-mixes are recommended. These pre-mixes are free of silt and phosphate and have a high bulk density.

Filter geotextile

The filtration geotextile helps to prevent clogging of the drainage layer. It is a non-woven fabric that is needle-punched from polypropylene staple fibers. It has a high resistance to environmental conditions, including rot and mildew. It is also resistant to rodents and insect damage. It is often used under growing medium.

This filter geotextile promotes a high flow rate while preventing media runoff. It also prevents soil particles from clogging the drainage core. This is especially important in the case of green roofs, where a granular drainage layer may not be available.

Its filtering function prevents the intermixing of granular sub-base layers, while blocking larger stone and soil particles. This enables the drainage layer to be constructed without risk of failure.

A key consideration in determining the required strength properties of a filter geotextile is the hydraulic gradient of the intended application. This is usually determined using a laboratory test (ASTM D 4318). It is recommended gabion fence suppliers that you select the filter geotextile with the largest opening size, which will satisfy the desired retention criteria.

Pre-cultivated vegetation blankets

Pre-vegetated blankets are used to provide immediate vegetative growth for green roof systems. They are available in various compositions, depending on the type of vegetation planned. They can also be designed to include curbs or borders to separate the vegetated and non-vegetated areas of the roof. These materials are usually a mix of organic and inorganic materials that support plant roots, aid in drainage, and retain water (Green Roofs for Healthy Cities and The Cardinal Group, 2006).

Vegetation blankets are lightweight, which makes them easy to transport and install on flat or curved roofs. The sedum plants in these blankets are low-growing, which means they won’t grow tall enough to cause maintenance issues or obstruct views. They also have a high drought-tolerance.

Most pre-vegetated blankets are shipped in trays, which can be easily transported by truck or rail. The trays should be kept in a temperature-controlled environment to prevent overheating during transit. Ideally, the trays should be shipped in a semi- or flatbed truck with tarping. This will ensure that the trays aren’t damaged during transport.