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Kristy McClain
Posts: 1
Location: central ohio/zone 5-4
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I am a new cob rookie and I am filled with enthusiasm to begin a project. I would love to build a small cob structure using the bones of an existing steel pole barn with a poured concrete floor. Is it possible to build directly over the poured floor or is digging a trenched foundation still required? If I choose to use this area as an open patio retreat; building a garden wall instead over the existing floor, is the answer the same?
(be gentle, I'm learning and appreciate the help)
allen lumley
Posts: 4154
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''
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Kristy McClain : Welcome to, With over 22,000 fellow members world wide, you should be able to come here 24 / 7 and find someone who wants
to talk about what you want to talk about. Their different viewpoints will stretch your mode even as you stretch theirs. A rising tide floats ALL Boats !

Because of the weight we are talking about here a trenched foundation is pretty much a given, with that comes a strong recommendation for a French Drain-
'Running to Daylight' !

Unfortunately Concrete made with portland cement wicks water, With a small slab you might get away with a plastic membrane or sealer of some kind, however
a failure of that material could easily allow enough water to seep into the cob to weaken its structure.

Location, location, location, look at your name space to the left of your post, and L@@K at mine! By going to the Permies toolbox at the top of the page between
the Permies Banner, and the Permies Video of the week you can select and clickon->'My Profile and on the net page you will be prompted to add profile and
preference information to aid your resource hunting, by adding your general location climate zone # and rainfall at Altitude you allow us to give you better more
specific information, and help make connections with like minded near neighbors, who may be Cob instructors! I came here originally to talk about D.I.Y. Rocket
Stoves made with LOTS of Cob, and found scores of sites with great information

Come back here and post comments and questions often, membership has its privileges ! For the Crafts ! Big AL !
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