Quote:
Originally Posted by TreeDimensional 
Lets think about this for a few seconds. What would happen to a street tree if we tore up the cement sidewalks, corrected the grade to allow for soil compaction (or divits), and layed a rubber sidewalk down. If the sheet of rubber was impervious to water and air, the only benefit would be to the users of the sidewalk. What if we layed a sheet of rubber down that had a pattern of holes manufactured into it. We accomplish the benefit to the users of the walkway, AND we give the tree a bit more recourse area to utilize the old impermiable area, and can now capture air AND water from under the sidewalk?
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That's a very good idea. The pics I posted earlier where from a story about this site last year, I managed to find it.
HoldFast Rubber Highway
My original interest was in the use of recycled tyres, 354,000 per mile, maybe if the sidewalk was laid in a similar way with a breathing vent, it would work like your idea.
