green roof: meaning, definition, pronunciation and examples
C1/C2 (Low-frequency, specialized technical/architectural term)Technical, Architectural, Environmental Policy, Academic, Semi-Formal
Quick answer
What does “green roof” mean?
A roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.
Audio
Pronunciation
Definition
Meaning and Definition
A roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.
A sustainable building technique for managing stormwater, reducing urban heat island effect, providing insulation, and creating wildlife habitats. Also used figuratively to refer to environmental urban initiatives.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. Spelling is identical. The term is used in both varieties, with possible regional variations in the specific plants used or local building regulations.
Connotations
Connotes sustainability, modern eco-friendly architecture, and urban planning in both cultures.
Frequency
Slightly more frequent in UK English in public discourse due to earlier widespread policy adoption (e.g., in London planning). In American English, it's common in architectural and environmental engineering contexts.
Grammar
How to Use “green roof” in a Sentence
[Building/Development] HAS a green roofto INSTALL a green roof ON [a building]a green roof MADE OF [sedum/wildflowers]a green roof DESIGNED to [reduce runoff]Vocabulary
Collocations
Examples
Examples of “green roof” in a Sentence
verb
British English
- The council is encouraging developers to green-roof new builds.
American English
- The city ordinance may require them to green-roof large commercial structures.
adverb
British English
- N/A
American English
- N/A
Usage
Meaning in Context
Business
The new corporate headquarters features a green roof to meet sustainability targets and reduce energy costs.
Academic
The study quantifies the impact of extensive green roofs on urban microclimates.
Everyday
They're putting a green roof on the bus shelter to help with drainage.
Technical
The green roof assembly consists of a root barrier, drainage layer, filter fabric, engineered growth medium, and drought-tolerant vegetation.
Vocabulary
Synonyms of “green roof”
Vocabulary
Antonyms of “green roof”
Watch out
Common Mistakes When Using “green roof”
- Using 'green roof' to describe a roof simply painted green.
- Misspelling as 'green roof' (one word) instead of the standard two-word noun phrase.
- Confusing 'extensive' (shallow, lightweight, low-maintenance) and 'intensive' (deep, heavy, park-like) green roof types.
FAQ
Frequently Asked Questions
Not exactly. A green roof is primarily an environmental building system focused on ecological benefits (stormwater, insulation). A roof garden is often deeper, used for recreation or agriculture, and may require more maintenance.
Properly designed and installed green roofs include multiple waterproofing and root protection layers, making them as reliable, if not more durable, than conventional roofs.
Structural capacity is the key factor. Older buildings may need reinforcement to bear the weight of soil and water, especially for intensive systems. A structural engineer must always assess this.
Hardy, drought-resistant, shallow-rooted plants like sedums, certain grasses, and wildflowers are typical for extensive systems. The choice depends on climate, roof depth, and desired appearance.
A roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.
Green roof is usually technical, architectural, environmental policy, academic, semi-formal in register.
Green roof: in British English it is pronounced /ˌɡriːn ˈruːf/, and in American English it is pronounced /ˌɡrin ˈruf/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[to be] ahead of the curve with a green roof”
- “[to put] a green cap on the city”
Learning
Memory Aids
Mnemonic
Think: A roof that grows GREEN plants, not just painted green.
Conceptual Metaphor
THE CITY IS AN ECOSYSTEM (where buildings can provide nature's functions).
Practice
Quiz
What is the PRIMARY purpose of an 'extensive' green roof?