[Cob] RE:marlin's rubble trench revisited

[Marlin Nissen]

Wow, that's an interesting idea....never imagined dropping urbanite down on top of stone and then more stone.....only wonder if water would get trapped more easily on top of the urbanite down in the trench? We throw a few larger stones (usally grapefruit size , found from excavation) back in around the river rock as we fill it up and tamp it. BTW we tamp every few inches of river stone in the trench by hand to make sure that it's settled into it's most likely lowest position before putting weight on it from above (urbanite and wall)....the river stone 'rings' when you can't tamp it anymore and you get a feel for it.
 
Another thing I forgot to mention is that our trench at the Madison project had drainage tile at the bottom that drained down to a 'Dry Well' to doubly make sure that water didn't stand UNDER the wall and tip it over or erode the sides of the trench.
 
Marlin

Mary Lou McFarland <louiethefifth at hotmail.com> wrote:
One more question about the river rock. If memory serves me correctly at 
our local concrete plant (the only place around here to buy aggregate) the 
river rock was more expensive than any of the crushed product, so would it 
work out okay to compact the rock than run a layer of urbanite in the trench 
than compact another layer of river rock over that, like a lasagna. I would 
have to rent a compactor but it would certainly help out on the cost of the 
rock.


		
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