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Kiko Denzer on Art
Cob: Re: Earth Floor!Patricia Kerns pkerns at twistedroad.com
Fri Nov 2 07:46:01 PST 2001
Ian Road Base is basically sand (and rocks, which I screen out) with just enough clay to make it stick together. Its a product designed to get superior compaction with no shrinkage when used as fill under road construction. I got the idea for using it from an Austin contractor who'd made several floors this way. I actually tried several tests before I started, mixing in even more sand to one mix and more earth to another. The mix with more earth cracked and the one with more sand crumbled and didn't stick together. I ended up using the mix as is. The really nice thing about this stuff is that it seems to be (by design, actually) just the right proportion. So it is basically ready-mix. I went to several demonstrations prior to doing my own floors where people were starting with earth and clay separately and mixing it all together. This was definitely the most labor intensive part of the whole operation. Patricia > Hi Patricia, > > Just a short note of caution. It is important to have a much higher > porportion of sand in your floor mix. Sand is what make floors and cob > hard. I have heard of some people who have had problems with their floors > being too soft. I suspect their mix has too much clay. I put just enough > clay in to stick the sand together, but no more. You would be surprised at > how little clay you need. My floor is rock hard but I haven't dropped > anything yet to really test it out. > > Ian > >
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