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[Cob] Re: How to get a straight wall with cobChristopher Peters bollygum211 at dodo.com.au
Sun Mar 6 01:18:35 PST 2005
G'day Lorraine, At a guess it sounds like perhaps it needed a little more mixing till the batch had a consistent moisture level with evenly dispersed clay particles throughout. Have you tried leaving the batch to sit overnight ? This will help with some of the really dry soils types here in Oz. Was this mixing using a tarp, pit or with machinery ? Here in the Bega Valley NSW, we've decomposed granite subsoils which set like their parent rock but are a bugger to mix by foot without making the mix too wet. By adding a red medium clay (basalt derived) gave me an excellent cob mix. I add only a barrow load to each ute load of the granite soil but it did the trick. In my case it was worth trying all the soils on the block and even mixing a few. A simple field test of dissolving a handful of soil in a jar and leaving it to settle into particle sizes adds a few more clues to a useful soil. What soil type are you using in SA ? have you any photos of this troublesome mix you could share with us.. Have you read "Building a house in a day" by Ron Edwards ? it's a good starter and available from the Owner Builder Mag's Bookshop, www.theownerbuilder.com.au which I have no connection with, just a happy customer :-) cheers & good to hear of a fellow cobber here downunder, chris >From: "Bob & Lorraine" <farmlink at bigpond.com> >Subject: [Cob] How to get a straight wall with cob? > > > >Today we started our first cob wall. It's brought us to some questions >I hope more experienced cobbers can help me with. > > > >What should a good mix look and feel like? > >Ours was patchy with some parts of it having a smooth, plasticiny feel, >some lumpy/gritty although wet, and some being a bit dryish and rubbly. >We tried various methods - forking whatever we came to onto the >foundation and patting it into shape, pressing it into cobs with our >hands then incorporating it onto the wall, and doing more mixing in the >mud pile before forking it onto the foundation. <snip>
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