From: Richard Archer <permaculture@juggernaut.com.au>
To: permaculture <permaculture@lists.ibiblio.org>
Subject: Re: [permaculture] Source for Hobbit hole construct...
Date: Sun, 7 Nov 2004 15:51:59 +1100
At 6:18 PM -0800 6/11/04, Paul Wheaton wrote:
>I suppose I could use 1/4 inch pencil rod for re-enforcement. Maybe
>three layers of
>chicken wire? 3/4 inch thick cement? 1 inch?
>
>For a dome-ish structure with a ten foot diameter, do you have any
>gueses on how much the
>cement might cost?
I don't know about the engineering questions, but...
A 1" thick shell of a complete sphere with 10 foot diameter has a
volume of 25 cubic feet. 3/4" thick = 19.4 cubic feet.
In my experience working with concrete the cost of the materials
pales into insignificance beside the cost of excavating, pouring
or spraying and finishing.