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Cob: RE: RE: Posts embedded in cobShawn Honeychurch ironfire at cyberlink.bc.ca
Thu Nov 2 21:04:06 PST 2000
Hey, this is great to know! Where we are there is rarely ever a hard rain. With large overhangs and proper gutters and drainage around the perimeter of the house, I could probably get away with a 1 foot foundation (above ground), then. I am still wondering about how to make a water proof barrier between cob and foundation if the foundation needs to be rough to stick to the cob. If we laid plastic on the top of a stone and mortar foundation, do you think this would do the trick? Would the cob still stick to that? Robynn ----- Original Message ----- From: "Shannon C. Dealy" <dealy at deatech.com> To: "Firstbrook, Will" <wfirstb1 at wcb.bc.ca> Cc: "'Shawn Honeychurch'" <ironfire at cyberlink.bc.ca>; <coblist at deatech.com> Sent: Thursday, November 02, 2000 8:16 PM Subject: Re: Cob: RE: RE: Posts embedded in cob > On Thu, 2 Nov 2000, Firstbrook, Will wrote: > > [snip] > > Regarding your design, my understanding is the cob should start approx. 2' > > above ground at least on the exterior so no water can be wicked up into the > > cob. Also the foundation that cob sits on should ideally be rough so the the > [snip] > > Actually, preventing wicking is not a matter of height, a one inch above > ground foundation with a waterproof barrier in it could do that providing > no standing water around the structure ever reaches the height at which > the water proof barrier is located. Wicking through even a quite short > concrete or rock foundation (without added water proofing) is unlikely to > have any effect on a cob wall unless the foundation is in standing water, > and possibly not even then. The main reason that I am aware of for the > high foundation is that when rain hits the ground (or plants or other > objects near the base of your wall) it splashes onto the wall and can/will > cause errosion in your wall. I have seen this effect on a couple of cob > structures (I actually stood out in the rain watching it for a while) and > was surprized at how much greater the damage was from the rain hitting the > ground or bushes and splashing the wall than it was from the rain which > hit the wall directly. From what I saw, rain hitting the wall directly > was minimal (due in part to the roof overhang) and tended to be absorbed > into the dry cob wall (rather than running down and erroding it), but of > course there was lots of rain hitting the ground and bushes around the > base of the buildings, and run off from the roof (which had no gutters) > greatly added to the water hitting the ground all around the perimeter of > the building. The combination of rain and run-off caused the base of the > wall to be splashed continuously up to a height of a couple feet leaving > the base of the wall looking quite damp even a couple days after the rain > stopped. There were also small but easily visible errosion tracks running > down the surface of the cob that was located within 1-1/2 to two feet of > ground level. > > Shannon C. Dealy | DeaTech Research Inc. > dealy at deatech.com | - Custom Software Development - > | Embedded Systems, Real-time, Device Drivers > Phone: (800) 467-5820 | Networking, Scientific & Engineering Applications > or: (541) 451-5177 | www.deatech.com > >
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