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M-Trays® Modular green roof system


Wallbarn produces an extensive sedum modular green roof system called M-Tray® .

M-Tray® is a ready-grown, fully established sedum green roof loaded into a portable tray, for easier installation of green roofs.

All the growing, filtration and drainage elements are included in the system and the shape of the modules means that each one is simply laid onto the deck and clipped to the next module to create one seamless, fully established green roof.

The major benefit of M-Tray® is flexibility. Getting it to the roof is not a disruptive and costly process, which is a huge advantage over loose lay systems. It is simply not possible to loose lay roll-out systems layer-by-layer on some roof areas due to access restrictions. M-Tray® can reach the roofs other systems cannot reach.

Access to the roof is future-proofed. If there are problems with the deck beneath or inspection is required, one M-Tray® or section can easily be lifted out without any disruption to the whole deck. With loose lay systems, the whole area may need to be destroyed when accessing the deck.

Each M-Tray® is 500mm x 500mm x 100mm deep. Each tray unit clips into its neighbour at four points. The sedum grows above this level to hide the joints. This interlocking system means that each M-Tray® is fitted securely with no need for sharp fixings going through the waterproofing beneath. The sedum growth is not restricted and can mingle across the whole area.

The M-Tray® modules are pre-grown in Wallbarn's UK nursery. The empty modules are made from polypropylene and are manufactured with an angled base which creates a large surface area for the roots to establish. The module is filled with our specially designed aggregate substrate mix.

The sedum vegetation is planted into the substrate. We use a mix of different species of sedum suited to the UK climate, to ensure all-year growth, flowers and biodiversity to attract wildlife with variation throughout the summer, durability and ability to be resistant to periods without rainfall.


The vegetation is grown into the M-TRAYS for a minimum six months to ensure strong, well established, healthy plants, fully integrated into the intermediate layers with solid root structures. This means less shock or bedding-in time and less risk of wind uplift or erosion in the crucial time period after installation.


Recycled content (%)75
Availability<1 week
WeightFully grown saturated weight maximum 30kg per unit
MaterialsPP tray units, recycled brick based aggregate,
SizesEach M-TRAY is 500mm x 500mm x 100mm deep. (4 M-Trays per Square Metre)
Colourssedum, sedum and wildflower, bespoke planting
NBS clausesQ37, 40-40-45


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Wallbarn is a manufacturer and distributor of specialist materials for structural waterproofing, flat roofing, terraces and landscape areas. They produce solutions for rooftop living.

Wallbarn supplies:
• The largest range of PEDESTALS...
View company profile
T0208 916 2258
F0208 916 2223
E[email protected]
WVisit Wallbarn's website
 Unit 16, Capital Business Centre, 22 Carlton Road, South Croydon, Surrey, CR2 0BS

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