Comment on the High Line

Editor’s Note: This article from August/September 2010 Geosynthetics prompted a reader’s comment about green roof thickness.

Comment

From: Al Barth
Posted: Aug. 25, 2010

The article on the High Line says the green roof system is 25mm thick. This seems quite small to accomodate all the component layers. Should this read 25cm?

Response

From: Ron Bygness, editor, Geosynthetics

Good catch and good question, Al!

Actually, the 25mm (about 1 inch) measurement is accurate.

But perhaps the exact wording in the article and the visual, “Green Roof System Build-Ups,” prompts this question about thickness.

The 25mm reference is specifically regarding the “egg-carton-shaped base, filled with gravel, and covered with a layer of geotextile filter fabric.” The 25mm reference is not descriptive of the entire 6-layer bottom-to-top system from (1) root barrier to (6) plant level, which is much thicker than 1 inch, as shown in the visual.

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