I did papercrete roofs and so far they are doing great. In one I laid a double layer of chicken wire over the vigas that are about 30 inches apart. I spread a layer of papercrete, some old papercrete blocks and another layer of papercete over that. The roof is solid but you can feel the flexiblilty of it when you walk on it. It has no leaks.
The second roof I did a little differently. I laid some of that inexpensive reed fencing over the vigas. On top of that I put some of that foil bubble insulation and about 5 inches of papercrete (with no blocks). This will require much less finishing (it is done inside while the first ceiling still needs to be plastered). This roof, although not as thick as the first one is completely rigid when you walk on it. I am not sure if it has leaks since it has not rained but I think I may have one where the insulation comes together and I failed to tape the joint. Stupid mistake if I have a leak there. I will probably have to apply a waterproof layer to the entire roof just to solve one leak. Time will tell.
The Making of Papercrete DVD now available on Amazon.com
http://www.amazon.com/Making-Papercrete-Judith-Williams/dp/B0040ZNE9A/ref=sr_1_1?ie=UTF8&s=dvd&qid=1283998627&sr=8-1
Follow progress on the new project at http://www.papercretebyjudith.com/blog
More papercrete info at http://squidoo.com/papercretebyjudith
To: papercreters@yahoogroups.com
From: ablueprincess@yahoo.com
Date: Fri, 5 Nov 2010 05:01:21 +0000
Subject: [papercreters] Re: rafters and beams and tying foundation into roof
Thank you. I guess mostly I am thinking about the roof. I really dont want to use lumber. Out here wood and plastic dont do well. The things that last are metal or concrete, but concrete cracks with our earthquakes. Ideally I would like a papercrete roof to span the 48 feet width and 50' length. But it will have interior walls that would be spaced every 12' apart.
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