Six assemblies from 26 to 190 lb/ft², flat decks through 3:12 slopes, retrofit through podium. Depth used to name this range and no longer does: choose by the outcome the project is held to and the build-up follows from it.
Answer four questions insteadMeristem LITE · Extensive
26 lb/ft² saturated
The thinnest full assembly we build, for decks with nothing left to give.
Optimised for lowest saturated load per unit of retention. Retains 55% of annual rainfall, 4" (100 mm) build-up, to 2:12 without stabilisation.
Explore the LITEMeristem TRAY · Extensive
32 lb/ft² saturated
Pre-grown modules that land planted and come up for deck access.
Optimised for phased installs and roofs that get opened again. Retains 50% of annual rainfall, 4.5" (115 mm) build-up, to 3:12.
Explore the TRAYMeristem MEADOW · Semi-intensive
44 lb/ft² saturated
A seeded native meadow, specified for habitat outcomes and audited for them.
Optimised for verified pollinator habitat, not a plant list. Retains 65% of annual rainfall, 6" (150 mm) build-up, to 2:12.
Explore the MEADOWMeristem RETAIN · Performance
55 lb/ft² saturated
A detention assembly with plants on it. Sized to a hydrograph, not a depth.
Optimised for contractual stormwater performance with controlled release. Retains 92% of annual rainfall, 8" (205 mm) total build-up build-up, to 1:12.
Explore the RETAINMeristem TERRACE · Intensive
120–190 lb/ft² saturated
Occupied roof: lawn, shrubs, trees, paving, and the structure to hold them.
Optimised for usable square footage on the roof plane. Retains 78% of annual rainfall, 12–24" (300–600 mm) build-up, to 1:12.
Explore the TERRACEMeristem BIOSOLAR · Performance
38 lb/ft² saturated
The array is ballasted by the roof it stands in, and runs cooler for it.
Optimised for panel yield and roof performance from one assembly. Retains 58% of annual rainfall, 5" (130 mm) build-up, to 2:12.
Explore the BIOSOLARType the name or code from your drawing. We will tell you what it is called now, and whether anything but the name changed.
| Specification | LITE | TRAY | MEADOW | RETAIN | TERRACE | BIOSOLAR |
|---|---|---|---|---|---|---|
| Family | Extensive | Extensive | Semi-intensive | Performance | Intensive | Performance |
| Depth | 4" (100 mm) | 4.5" (115 mm) | 6" (150 mm) | 8" (205 mm) total build-up | 12–24" (300–600 mm) | 5" (130 mm) |
| Saturated load | 26 lb/ft² saturated | 32 lb/ft² saturated | 44 lb/ft² saturated | 55 lb/ft² saturated | 120–190 lb/ft² saturated | 38 lb/ft² saturated |
| Annual retention | 55% | 50% | 65% | 92% | 78% | 58% |
| Max slope | to 2:12 without stabilisation | to 3:12 | to 2:12 | to 1:12 | to 1:12 | to 2:12 |
| Fire | ASTM E108 Class A (with border ballast) | ASTM E108 Class A | ASTM E108 Class A (with maintained fuel breaks) | ASTM E108 Class A | ASTM E108 Class A | ASTM E108 Class A, 24" vegetation-free zone at array |
| Maintenance | 2 visits/year | 2 visits/year | 3 visits/year, one cut | 2 visits/year + annual outlet check | Landscape contract, 8+ visits/year | 2 visits/year, coordinated with O&M |
Full load tables, wind and fire reports live in the technical portal.