Table 2 The RAC for assessing GRES

Green roof structure

 Green roof types

❑ Intensive ❑ Extensive

 Green roof area

Percentage of green roof area in total floor area

%

*Green roof area: m²

Floor area m²

 Green area of green roof

m²

 Green roof height

Floor that the green roof is located on

level(s)

 Substrate depth

Garden bed: depth of growing media layer

Flowerpot: average of soil depth in flowerpots

cm.

 Continuous coverage of substrate

Percentage of area covered by substrate in green roof

%

*Green roof area m²

Substrate covered area m²

 Drainage

❑ Yes ❑ No

 Area exposed to sunlight

Percentage of sunlight-exposed concrete area in total hardscape area

%

*Total hardscape area m²

Concrete area that exposed to sunlight m²

 Permeable surface area

Percentage of permeable surface area in a green roof

%

*Green roof area m²

Permeable surface area m²

 Storage reservoirs

Existence of any water containers, e.g., bird baths and barrels, and ponds

❑Yes ❑No

 Water sources

E.g., ponds, swimming pools, basins, and water tap

❑ Yes ❑ No

 Connectivity to natural habitat

The near green area at ground level within a 200-m radius from the green roof

❑ Yes ❑ No

 Light soil

❑ Yes ❑ No

 Soil pH

(pH)

 Undisturbed soil

Opened area that is not disturbed by vegetation or any constructions

❑ Yes ❑ No

 Topographic variation

Provision of topographic variety

E.g., sloped surfaces, different heights of garden beds, flowerpots, and edging

❑ Yes ❑ No

 Nesting opportunities

Provision of elements for nesting of birds and insects

E.g., bare area, birdhouses, bee houses, tall shrubs, and branches

❑ Yes ❑ No

 Perching habitat

Provision of elements for attraction insects and birds to perch, e.g., branches, logs, and rocks

❑ Yes ❑ No

 Sunlight hours on green roof

Hours/day

Major vegetation cover

Majority of vegetation types that have the most percentage of plant cover in total green roof area

❑ Tree ❑ Shrub ❑ Herb ❑ Grass

Tree cover: %

Shrub cover: %

Herb cover: %

Grass cover: %

 Woody plants

E.g., trees and shrubs

❑ Yes ❑ No

 Vegetation species

Majority of plant species that mostly found on the green roof

❑ Evergreen species ❑ Deciduous species

 Planting systems

❑ Monoculture ❑ Polyculture

 Phytoremediation potential of plant

❑ Yes ❑ No

 Flowering plants

❑ Yes ❑ No

 Plants with seasonal variety

❑ Yes ❑ No

 Plant species selection

❑ Exotic species ❑ Native species ❑ Both

 Number of trees

tree(s)

 Number of plants that provide shade for the building in each building side

Length in each building side: m.

Number of plants in each building side tree(s)

 Vertical structure of plants

Percentage of tree covered area in total plant cover area

%

 Edible plants

❑ Yes ❑ No

Available crop yields

❑ Yes ❑ No

Crop damage by animals

❑ Yes ❑ No

Plant with long blooming season

❑ Yes ❑ No

 Fertilizer application

❑ Yes ❑ No

 Pesticide used

❑ Yes ❑ No

 Water access

E.g., water tap

❑ Yes ❑ No

Drip irrigation system

❑ Yes ❑ No

 Sun protection

E.g., sunblock garden netting mesh

❑ Yes ❑ No

 A wind breaker

E.g., windbreak mesh

❑ Yes ❑ No

Messy appearance

E.g., dirty, untidy, and abandoned area

❑ Yes ❑ No

 Accessibility

Permission to use green roof

❑ Yes ❑ No

 Number of building visitors/customers

person(s)/day

 Facility for recreation

E.g., chairs, tables, sunshades, footpath, lights, a swimming pool, and playground

❑ Yes ❑ No

 Facility for education

E.g., plant species labels

❑ Yes ❑ No

 Education activities

E.g., green roof tour or ecotourism

❑ Yes ❑ No