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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Fitting Riefa Green Roofs

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How are they fitted?

The Riefa roof boards are laid directly onto the water proof membrane, they are desiccated when they arrive on site and should be wetted until it is able to take an indentation, it starts life like ryevita and becomes a weetabix.

The board is placed as a single even layer. When the board is damp the pre grown sedum or wild flower turf is laid on top.

There is no requirement for any other layers of filters fleece or drainage mats.

How much watering do I need to do as part of the installation?

Place the Riefa board on top of the waterproof membrane and then water intermittently until soft. Once the board is soft, you can place the sedum (or other vegetation covering) on top. Then spray the sedum with more water. During particularly wet weather you may want to use less water and the opposite may apply during a dry spell.

NB. If working on a pitched roof, you may require more water due to greater run off depending on the degree of pitch. The absorption rate on pitched roofs under normal conditions tends to be longer than on a flat roof.

If there a minimum pitch for the Riefa green roofing system?

There is no minimum pitch specification for our green roofing system. If you have a specific question regarding the pitch of your roof then please do get in touch. We are always more than happy to answer your questions.

What technical data do I need to be aware of prior to fitting?

Board size = 1.2m x 1m x 36mm
Installation requirements = 1 layer of 36mm board
Board weight (dry) = 8 kg per m2
Board weight (wet) = 15 kg per m2
Complete system weight (saturated) = 36 kg per m2
Complete system profile depth = 75 mm

Where can Riefa® Boards be used?

* Commercial roofs - from bus shelters through to industrial applications
* Domestic roofs (including sheds, stables, kennels, summer houses etc)
* Embankments and cuttings - giving instant, full colour, living results
* Prevention of soil erosion
* Riefa you can fit a roof to it, you can probably fit a Riefa® Roof to it!

Which way up does the Riefa board go?

The boards have been used both ways to great success, but Riefa recommends that the coir (the rough side) is placed face-up with the board flat against the waterproof membrane.

Who can fit Riefa® Board?

The Riefa® green roof system is very easy to install. The ultra light weight nature of the board and the 'ready to roll' pre-grown sedum vegetation layer means no specialist tools are necessary. This makes it an ideal product for everyone, from professional roofing contractors and builders right down to a competent D.I.Y enthusiast

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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