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Roof structure without wood?

 
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Does anyone have experience with or know about alternatives to the usual wood beams or truss structure for a roof?  I'm looking for alternatives to avoid mold food.  I don't want anything that would encourage the growth of fungi due to recovery from mold illness.  We are looking to build with something like rammed earth which won't grow mold, but I don't know how a roof structure would be built.  
 
pollinator
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Steel would work
 
pollinator
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Steel or ferrocement.. beyond those, there are doubtless ways to do it with fibreglass or maybe some wood-free SIP options, but more exotic=more $$$...
 
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I have never seen mold in the roof. Plenty in the floor, but never in the roof. Even with leaks in a damp climate.

So my guess would be that a (ventilated) wooden roof should be mold-free.

For an inorganic roof, Vaults are an option.
 
John Valdes
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Thank you all for the input, and I welcome any additional!
I'm adding these suggestions to my research bucket.  I thought about steel for a while, but I haven't looked at the cost.  I never thought about fiberglass.  
Over the weekend, I was looking at videos on natural buildings with earth block arches and also "super-adobe" (more info on that here -- https://www.calearth.org/tour), and it looks like you can do dome and arched roofs.  I might actually build a small dome shelter to get us through winter after we purchase land to build on.  It seems that it's a really quick, low tech, and low cost way to get a solid structure with thermal mass up.  Then I would plan and start building our main house where I'm more concerned about the roof structure.  
 
D Nikolls
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John Valdes wrote:Thank you all for the input, and I welcome any additional!
I'm adding these suggestions to my research bucket.  I thought about steel for a while, but I haven't looked at the cost.  I never thought about fiberglass.  
Over the weekend, I was looking at videos on natural buildings with earth block arches and also "super-adobe" (more info on that here -- https://www.calearth.org/tour), and it looks like you can do dome and arched roofs.  I might actually build a small dome shelter to get us through winter after we purchase land to build on.  It seems that it's a really quick, low tech, and low cost way to get a solid structure with thermal mass up.  Then I would plan and start building our main house where I'm more concerned about the roof structure.  



If you don't have quite a lot of building experience, I would really suggest using the same method for the initial structure as you intend to use for the main home; there are always lessons to be learned, whether it ends up improving your skills and design, or convincing you that another method would be better!
 
D Nikolls
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John Valdes wrote:
I'm adding these suggestions to my research bucket.  I thought about steel for a while, but I haven't looked at the cost.  .  



New steel is a bit dear, but if you have access to a big city, try craigslist... I often see large pieces available at very tempting prices, in the nearest large city. Not much use to me when each way is 6+ hours and several hundred dollars for truck/trailer on the ferry.. but perhaps your access is better!
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