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4 Key Areas of Maintenance For Your Green Roof

August 10th, 2023

Wallbarn is at the forefront of developments in the green roofing sector and has always provided products that combine top-quality ingredients with user-friendly, hassle-free maintenance.

Whilst it is true that green roofs are low-maintenance, they are not ‘no-maintenance’ and as such will need a little looking after from time to time.

Below we have identified 4 of the key areas that should receive some attention.

1) Removal of undesirable weeds – Windblown seeds and weeds can find their way into all sorts of areas which they are not required. As such, efforts should be made to remove all unrequired vegetation which could prove to be detrimental to the sedum and structure of the green roof. These weeds can be removed simply by hand pulling.

2) Irrigation – It’s essential to check that the irrigation system (if applicable) is still working correctly to ensure the green roof is receiving enough moisture and replace the timer batteries if necessary. If your green roof has any particular rain sheltered areas, the deeper M-Tray® substrate-level will hold more moisture, and therefore give the plants more chance during hotter, drier periods. However, as demonstrated in the extremely hot, dry summer in 2018, all plants including green roofs will require artificial irrigation to prevent the plants dying. Check irrigation pipes for damage from mice and other pests.

3) Fertilisers – Apply a suitable slow-release granular fertiliser at a rate of 50gsm at the start of the spring growing period. All plants require fertilizing in the longer term to ensure sufficient nutrient levels for your green roof. The application of fertiliser should always be kept to a minimum but is required to help maintain the health of certain plant species. Granular fertilizers suitable for sedum are available from many garden centres.

Please Note – Where rainwater is harvested from a green roof, fertiliser should not be applied.

4) Drain Heads and Outlets – It is important to clear all debris from drainage outlets to help ensure the optimum performance. It is essential to ensure that excess water is able to leave the roof, to avoid ponding and overloading of your green roof.

What makes the M-Tray® unique?

Our M-Tray® has been specifically designed to make sedum roof installation quick and easy – with minimum disruption to the plants and the structure they are going onto – and to provide a seamless, verdant finish – an instant and sustainable green roof.