Green Roofing Solutions

Our green roofs not only offer environmental benefits – but they also look stunning and can provide outstanding outdoor recreational spaces. We’ve been installing them for over 15 years in the North West, totally transforming many developments.

Green roofs are now a common feature of many new construction projects within all sectors, and AAC Waterproofing has specialist teams who have been supplying and installing green roofs for over fifteen years.

We are able to supply, coordinate and install the entire system, from the base level waterproofing system to the finished planted roof covering. According to the project requirements, we can either install the waterproofing and green covering to a client’s specification, or we can supply and install our own proprietary systems. We are also experienced in the formation of hard-landscaped areas on roofs and terraces.

Whether you are looking to enhance a planning application, provide storm water management or simply want the improved aesthetics of a green roof covering, our in-house specialists can provide advice on the system best suited to your requirements.

Designing A Green Roof

There are multiple varieties of green roofs such as Extensive, Intensive (and semi-intensive), Bio-diverse and Brown (which is actually a variation on green roofs!). AAC have the in-house experience to assist with the design of the green roof in terms of layout and component build-up.

Below we provide a basic outline of the different types of green roof. We will be happy to discuss your specific requirements in more detail.

Green Roof Guide

Benefits Of Green Roofs

  • Provides a natural habitat for flora and fauna and aids biodiversity within an urban area
  • Provides water attenuation from roofs by reducing the rate of rainfall run-off, helping to avoid storm-water drainage surcharges. Contributes to Sustainable Urban Drainage (SUDs) schemes
  • Can assist Local Authority Planning applications by helping to blend the building into its surroundings, and meeting local policy targets for sustainable environment
  • Improved air quality – vegetation assists in reducing gaseous pollutants and air-borne dust particles
  • Provides cooling effect, lowering building running costs (cooling public & commercial buildings in summer – particularly glass-faced buildings – can cost more than winter heating)
  • Increased life expectancy of waterproofing membranes when protected by green roof covering. The waterproofing is not exposed to weathering.
  • Additional asset of recreational space on roof – increases property value
  • Mitigates land lost under the building’s footprint
  • Noise reduction within the building
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Extensive Green Roofs

Thin layer, lightweight green roof coverings. Normally formed with pre-grown sedum matting on a thin layer of suitable growing medium (approx. 60-100mm).

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Extensive Green Roof Benefits

  • Typical finished sedum roof pitch of 1.5-30°
  • Fast, lightweight installation
  • Usually self-sustaining, requiring minimal maintenance
  • Instant visual effect
  • Enhances natural habitat
  • Design versatility
  • Improved acoustic performance
  • Energy efficient (cooling in summer)
  • Improved life expectancy of waterproofing
  • Prevents rapid storm-water run-of

Intensive Green Roofs

Formed from greater thicknesses of growing medium to support wider varieties of plant or bush species. Thickness is dependant on types of vegetation required but will be a minimum of 150mm, up to 1000mm in more elaborate designs. The greater depths also allow for incorporation of landscape design features such as water features, lighting and recreational areas.


Intensive green roof – generally have thickness greater than 400mm. Bushes and shrubs can be supported.

Semi-intensive – generally 150-400mm thickness. Wider variety of rocky plants at the lower thickness (150-200mm) than sedum matting. Wildflowers & heathers possible in deeper mediums (200-400mm)

Brown roof – Roof will be covered with growing mediums to varying depths, along with habitat forming materials such as logs, rocks, brick debris etc, but no seed or planting. Roof is allowed to self-propagate by nature over time. Local conditions will dictate the finished appearance of the roof.

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Intensive Green Roof Benefits

  • Typical finished garden roof pitch of 1.5-5°
  • Can support shrub, lawn planting, patio, and decking etc.
  • Facilitates creation of leisure areas, providing additional space
  • Greater water retention potential – reducing storm-water drainage surcharges
  • Greater design versatility
  • Improved acoustic performance
  • Energy efficient – reduces summer cooling costs
  • Improved life expectancy of waterproofing