RIEFA Green Roofing Solutions RIEFA Green Roofing Solutions
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Frequently Asked Questions

We have collated a comprehensive list of questions that we are asked. If we have made any omissions and you wish to add to this list, or if you would like to find out more about our services, contact us for more details.

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About Riefa Green Roofs

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Does a roof always need the automatic irrigation system or can it just be watered when needed from a hose?

Riefa green roofs do not require any irrigation in the UK, the boards and sedum turf are capable of surviving and thriving in extreme conditions of drought for at least 6 weeks.

What are the characteristics of a Riefa® Board?

* High water absorption and releasing capacity up to 15 l/m2
* Perculation rate of 1 litre per hour
* Temperature regulating properties, resistance against ultraviolet radiation
* Non-residual, because boards consist of regrowing raw materials and mineral additives
* Low density and thus low weight of 250-350 kg/m3
* Excellent structural stability
* Neutral pH values between 6.5 and 7.5

What are the main benefits of having a Riefa® Board green roof system?

There are many benefits of having green roofing for your home or place of work, including a number of significant structural, environmental and social benefits. Riefa® roof greening systems are an ecologically and economically useful alternative for conventionally covered roofs. Benefits include:

* Due to the light weight of Riefa® Board you are able to retrofit it to existing conventional roofs - both pitched and flat
* Cost - a Riefa® Board greening system is a fraction of the cost of any conventional green roofing systems on the market
* Speed - The light weight construction makes fitting quick and easy
* Low maintenance - Like conventional roofs, an annual inspection is all that is required
* Energy conservation - save on heating costs thereby saving on your carbon output
* Sound insulation - Riefa® Board is ideal for properties in high noise areas (e.g, near airports) or where noise abatement is required (e.g, respite homes, recording studios)
* Improved biodiversity
* Extend the life of the covered roof - by up to three times over a roof that is exposed to the elements and UV radiation
* Improved air quality - Riefa® Board with a vegetation layer will absorb not just CO2, but also dust particles
* Storm water management - planted Riefa® Board will not just significantly reduce water off-flow, it will also filter the water that passes through it. Reducing lead, copper, cadmium, zinc, nitrogen and other impurities that flow off into rain sewers and the surrounding rivers

What is Riefa® Board?

Riefa® Board is an innovation in Roof Greening Systems. The boards are produced from a mixture of grains, fibres and mineral additives according to a patented process. Riefa® Board guarantees a stable, sustainable, secure medium for the development of hundreds of different types of vegetation. Riefa® Board is also the first and only system available that is completely suitable for retro-fitting to existing pitched and flat roofs. This is due to Riefa® Board's ultra light weight Riefa

Where can Riefa® Board be used?

The applications for the Riefa® Board system really are countless. The only limitation is your imagination. Due to its unmatched lightness, Riefa® Board is fully retro-fittable to existing pitched or flat roof applications. Once moistened Riefa® Board becomes extremely flexible without tearing. This means it can be molded around and/or pressed into extreme contours (e.g, gullies, tight curves and apexes). But Riefa® Board is so much more than a green roofing solution, almost any surface can be covered with Riefa® Board and sedum. From a garden shed or bus shelter right up to an airplane hanger. It's even been used as part of a modern art installation! And due to the excellent erosion reduction properties of Riefa® Board it is also ideal for covering embankments and cuttings, giving them an instant, beautiful covering of living colour

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Green Roof Systems for your Home or Business

Riefa® Board is a unique ultra light weight roof greening product. The first and only green roofing system suitable for both new build and legacy roof projects. Ideal for sedum roof or bespoke planting.

Assured Green Roofing
  • New build or retrofit on flat or pitched green roofs
  • Only 36kg/m2 (inc. vegetation layer) when saturated
  • Reduces rain water run off by up to 50%
  • No specialist installation skills or tools needed
  • Ideal for your sedum roof project