Green Roofing

Rubber roofing membranes can be used in green roofing for the waterproofing layer.

Green roofing involves partially or entirely covering a roof with vegetation on top of several layers of drainage and waterproofing.

The vegetation may retain a lot of water which may otherwise damage the roof deck or cause leakage, so EPDM can prove to be the ideal waterproofing layer to enhance reliability.

Green roofing is considerably heavier than other types of roofing materials and may require a professional survey of the roof deck to ensure it is capable of handling the additional weight. Planning permission from the local authority may also be required.

Green roofing is purely meant for its aesthetic value and environmental benefit. It is a beautiful way of promoting environmentalism.

Green roofs are mainly installed by organizations for good appeal and reduction of energy consumption, although domestic green roofing is growing in popularity and is being actively encouraged by local authorities in some regions of the UK.

Although the initial cost of installation can be higher initially than other types of roofing, green roofing is economical in the long run and worth the investment.

 The benefits that come with green roofing overshadow its initial costs.

It can increase the lifespan of a conventional roof, is kind to the environment, requires little or no maintenance once correctly installed and established and adds considerable aesthetic value.

The installation of green roofing can be undertaken by a good DIYer, but it is recommended that professional planning advice is sought. It is worth bearing in mind that the engagement of a qualified, insured and experienced professional could prove significantly cheaper in the long-term, as green roofing mistakes can prove expensive and disastrous. It is a process that involves structural analysis and multilayering of roofing systems.

Green roofing cuts down energy costs through natural insulation. The vegetation absorbs heat, acting as an insulator for the buildings. This reduces the energy spent on heating and cooling systems in building. The vegetation has stable surface temperatures and maintain the air temperature, or give a cooler temperature, which is contrary to conventional roofing methods.

The absorption of heat also contributes towards the reduction of the urban heat island effect. The vegetation protects the roof membrane from the effect of the ultra-violet radiation and ozone.

Different types of vegetation can be used, such as:

  • Moss
  • Succulent plants
  • Sedum
  • Mixed coarse and soft grasses

During evapo-transpiration, heat energy is used up by the vegetation causing the evaporation of excess moisture into the atmosphere. This brings about a cooling effect which helps to control the surrounding temperatures.

Green roofing reduces the water runoff and sewer overflows.  The vegetation and the soil help in the absorption of the filtering water which could otherwise contribute to surface flooding.

During installation of the green roof, the EPDM rubber roofing sheet can be applied as the waterproofing layer. The rubber sheet is installed at the base of the roof deck. Being lightweight, it contributes to the reduction of the weight of the roof. EPDM rubber sheets are highly resistant to water and to the absorption of moisture.

This quality makes it ideal in the installation of green roofs since the vegetation retains moisture that may otherwise seep into the building.