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Make a Cob Sink - naturalbuilding.straw.cobsink PEP BB

BB natural building - straw badge
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This is a badge bit (BB) that is part of the PEP curriculum.  Completing this BB is part of getting the straw badge in Natural Building.

For this BB, you will be making a cob sink!

To document completion of the BB, provide proof of the following:
  - Plaster with earthen plaster
  - Include drain pipe and plumbing/faucet
  - Oil with drying oil (linseed, tung, hemp, etc) and burnish till glossy
  - When dried, it must hold water overnight without becoming soft or muddy
  - Provide images of your process, stages of the build
  - Provide video of inspecting the sink after holding water for a minimum of 12 hours. Show edge details, show that water has NOT seeped under or into the sink body.
Posts: 405
Location: Victor, Montana; Zone 5b
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Is there room in this badge to do tadelakt over the cob rather than oiling? Could include the burnishing and soaping process?
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Location: Northern WI (zone 4)
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Sure, I think the key to this one is making the sink from cob, making it waterproof and having it be completely non toxic.  If you come up with another way, we'll very likely approve it.  Or if you suggest a clear re-wording of the BB that includes your intended process, we can tweak it now.
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