[Cob] drainage level

[Amanda Peck]

I see what your friend is looking at.  Especially showing the drain close to 
the pipe(s) under the foundation to carry in utilities--electricity, water, 
gas, phone.

But that particular drain is almost certainly sloped to daylight off to the 
side.  And it probably catches the water coming off the large roof overhang. 
  We use 4"/10 CM (about) pipe perforated only on the top to make these 
drains.  they carry quite a bit of water.

In the little room at one end of my barn, we put a drain right under the all 
gravel foundation which is somewhat wider than my wall, which Bee does not 
have.  And a second one out farther to catch water coming off the bank.  
Both drain to daylight, so we didn't pay much attention to whether the outer 
one was above or below the foundation drain, and considering how awful the 
site is to dig, it's definitely above.   I suspect that that outer drain 
works fine to catch the water coming off the bank, and the one under the 
foundation to divert water from under the little room.  But not the water 
off the roof over the pole barn proper.  I need to get gutters up on that 
side.

I think though that I would probably put my floor (and the stem-wall) higher 
than she's recommending, although it's very nice not to have steps up to a 
porch.  But she's built, and presumably gotten feedback on the subject from 
more house owners than I'll ever be in touch with.  Even back when she wrote 
the book.

....................
Predrag Cvetkovic wrote:

I showed one my friend nice Cob Builders handbook from www.weblife.org to
introduce him to cob. He is plumbing and sewerage systems designer.

On page "Foundation Summary" they show a drainage system. The level of
perforated pipe is a bit lower or almost the same as the level of
foundation. My friend suggested that level must be higher, if not, water can
flow under foundation and the foundation can settle. The situation in the
pictire on that page is maybe special one, because of the slope?

I would appreciate your comments.

Predrag Cvetkovic