I saw some designs where a roof was placed over the earth bag walls. What is the advantage/ disadvantage of this design over using the earth bags to form a domed roof?
There is certainly no structural need for a separate roof. I suspect that the choice was made for either aesthetic or moisture proofing reasons. How do you keep the moisture out of an earthbag dome? With my domes, I used scoria to fill the bags and plastered them with papercrete, which in the fairly arid southwest US was fine. In a damper climate, like Malaysia, further measures would have to be taken, such as a moisture-proof plaster or the use of a plastic liner over the dome before it gets plastered. With either of these choices, it can be tricky to assure that no moisture enters the structure.
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