Hi Paul, just found this forum & richsoil - yeah!!! (looooong -time DIY/self-sufficiency afficionado

I'm in hog heaven purusing all this stuff! (took years of leave for political activism - Bucky was right - it is a dead end - back to my heart's desire
Just a quick insert re: wofati (yes, I too ran across Oehler years ago

at richsoil - //...'if polyethelene could be replaced with....racking my brain...'//. See pg 14 of
Planting Green Roofs and Living Walls, N Dunnet et al - "Diagram of traditional Scandanavian turf roof with sections of
birch bark forming a waterproof layer."
(Now to go wallow in more of the Rich Soil here....
