Use code GIFT20
Have a look at the Hydraform system. (www.hydraform.com)
The blocks made with this machine are fantastic in that local materials are used to produce dry stacked walls that can be erected by unskilled labour. Due to the high thermal mass the houses are very comfortable to live in. Hydaform has carried out lots of earthquake test and these walls are earthquake safe.
Look at their website for information.
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