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I think the newly added value "plants" is badly chosen - it's impossible to tell from the value itself that it is supposed to represent a "roof" (I'm also not sure whether it can actually be called that) as shown in the picture. --Tordanik 14:51, 16 June 2013 (UTC)

That is not a roof at all.
But what about a green roof, (live) sod roof, living roof or, roof garden? Michael Z. 2014-10-09 21:26 z

Default roof material

What is the default roof material? Presumably the same material as the building[:part] itself? --Abbafei (talk) 06:49, 29 December 2014 (UTC)

I don't think there is a standardized default material at the moment. My own implementation prioritizes the roof:material on the individual building:part, then falls back to that of the enclosing building, and ultimately defaults to a tiled roof. A case could be made to make the default dependent on the building material, or even the country/region instead. --Tordanik 17:41, 31 December 2014 (UTC)

Shade Cloth

Added shadecloth - used in warmer climates. As well as covering plants it is also used for play areas to reduce the exposure to sun light. Warin61 (talk) 23:00, 9 September 2015 (UTC)

Plastic, asphalt

Plastic (PE or similar) roofs are common to cover garden huts etc. here. I will add roof:material=plastic for this, it is already used 142x. It looks similar to roof:material=eternit, but it's usually partly transparent.

I also want to add a similar one to plastic and bitumen, but made of asphalt. This is similar to tar_paper, but it is usually corrugated, stronger and doesn't need the underside covered continuously (sorry, I couldn't find the English word). It is clearly distinct from tar paper. I propose material=asphalt, it has 90 uses in taginfo. --V0174 (talk) 11:46, 3 December 2016 (UTC)