屋上緑化における失敗事例を、個別論ではなく構造的に整理する技術解説サイトです。
A neutral technical site that analyzes rooftop greening failures from a structural perspective.

A technical reference site that explains the structural causes of green roof failures

Rooftop Greening Failures Originate in Structural Design

Rooftop greening is, by nature, an effective means of enhancing a building’s environmental performance and visual value.

However, in real-world practice, it is not uncommon to encounter situations such as:

“The system was installed, but its condition deteriorated after only a few years.”
“The plants did not die, but the greenery never fully developed.”
“Maintenance could not be sustained, and the installation was ultimately left unmanaged.”
“There were no apparent issues initially, but uneven growth became noticeable several years later.”

“Problems with the irrigation system were only discovered after the vegetation had already declined.”

This website does not treat such outcomes simply as isolated cases of poor installation or insufficient maintenance.
Instead, it aims to analyze rooftop greening failures from their underlying structural causes.

By examining the planning assumptions, design thinking, and systemic conditions behind these projects, this site provides a neutral,
technical explanation intended to support more sustainable and resilient rooftop greening decisions.

Failure is not determined after installation — it is determined by the way of thinking.

How the rooftop environment is understood, what assumptions guide the selection, and how far future conditions are anticipated —
it is the accumulation of these decisions that ultimately shapes the outcome.

The Structure Behind Sound Judgment

What We Mean by “Structural Causes” on This Site

The term “structural causes” as used here does not refer to the quality of specific products, construction methods, or individual contractors.

Structures That Lead to Failure

About This Site — Our Position

This website is not intended to promote, compare, or criticize any specific products, systems, methods, or manufacturers.
It does not reference competing product names, rank alternatives, or rely on emotional criticism or personal anecdotes.

Rather, the purpose of this site is to organize and explain, in general terms, the ways of thinking required for rooftop greening to succeed.

By doing so, we aim to enable readers to reflect on their own projects or past cases and to make informed judgments on their own, based on a structural understanding rather than product-driven information.

Intended Audience

This website is primarily intended for readers in the following roles:

・Designers and planners involved in rooftop greening projects
・Professionals responsible for construction and maintenance
・Government and public-sector officials
・Building owners and property managers

This content is for those who wish to examine questions such as:

“Why did this project fail?”
“Will this plan remain viable several years from now?”

—not through product specifications or marketing claims, but through a structural, conceptual perspective.