Also take a look at these roofs after year out in the weather and kids climbing on them
http://www.ferrocement.com/Roof-repair-2010/roof-repair-10-29-2010.1.html
--- In papercreters@yahoogroups.com, "prrr.t21@..." <prrr@...> wrote:
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> 'Latex' paints contain pva and/or acrylic binders, which are a long way short of the level of waterproofness needed for outdoor use as a binder here in England. I dare say they'd work in a near desert climate, but over here much more waterproof compounds than those, eg PU, are inadequate.
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> I don't fancy my chances with a highly porous roof material with a little added water soluble binder, I can't see it has any realistic chance of keeping dripping wet out of the building.
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> The only way I can see that might work for a roof here is to saturate the topside of the papercrete with bitumen in solvent, using a thin mix first to get it to penetrate as far as possible. The result would be excessive drying time, making construction problematic. Hopefully the insulation value of the unsaturated papercrete would prevent too much condensation, and what does occur could hopefully dry out without dripping. If the material cracks, the roofing would soon saturate. My thinking is this should be more durable than bitumen felting.
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> --- In papercreters@yahoogroups.com, JUDITH WILLIAMS williams_judith@ wrote:
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> > I have experimented with adding latex paint to the mix. The first batch I did was about 5 gallons paint to my 200 gallon mixer. I plastered a small area of wall just to see what would happen and 5 years later it is still up there. I live in a dry climate so cannot advise you but I would say it's worth a try. Make a batch and try it out.
> > I am thinking of doing something like this when I plaster the roof I have onthere now. I have a papercrete roof on each building. On the first one I laid down a good base of slurry then placed blocks into it and covered the whole thing with seems to have worked out OK. On the second building I put down those reed mats they sell at the store. On top of that I put some of that foil wrapped insulation that comes in a roll. I put 3 layers of papercrete over that. It hasn't leaked but is too thin. Some of it has lifted a bit so I'm going to put more papercrete on top of it in the spring. That's where I may add some paint to the mix.
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> > Follow progress on the new project at http://www.papercretebyjudith.com/blog
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> > More papercrete info at http://squidoo.com/papercretebyjudith
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> > To: papercreters@yahoogroups.com
> > From: prrr@
> > Date: Tue, 24 Jan 2012 00:31:56 +0000
> > Subject: [papercreters] Re: Papercrete roof panels?
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> > I'm interested in a small papercrete roof, probably for next year. I live in a wet climte in England, and if I used plain papercrete I'm sure they'd become saturated with water in winter, and make everything inside rust & rot. How could that be prevented? I gather a waterproof overcoating tends to cause problems.
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> > Regards, NT
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> > --- In papercreters@yahoogroups.com, JUDITH WILLIAMS <williams_judith@> wrote:
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> > > I have done 2 papercrete roofs. I just continued the walls right up and over the top. Pics are in my blog. I have noticed some cracks at corners of doors and around the perimeter of the roof itself. I think adding more cement to the mix would have prevenedt this. I plan to go around and fill all cracks with expandable foam before plastering. I am no expert on this. Just learning as I go along. I would think the Currys in TX had done some papercrete roofs. They are not in this group but have a blog. I will give the link in the next email.
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> > > I also experimented with roof panels. I made them about 30" x 48". I made the form, poured half the slurry, set a piece of wire fence over that (in the middle) then poured the rest. It is important to let it set up completely before moving it. I moved mine too early and they warped.
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> > > Follow progress on the new project at http://www.papercretebyjudith.com/blog
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> > > More papercrete info at http://squidoo.com/papercretebyjudith
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> > > To: papercreters@yahoogroups.com
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> > > From: tatsass@
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> > > Date: Sun, 22 Jan 2012 15:37:34 -0800
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> > > Subject: Re: [papercreters] Papercrete roof panels?
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> > > ..lex terry in new mexico did...
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> > > im not sure if he is on this group...
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> > > i know he is on facebook ...
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> > > From: Alan <rustaholic777@>
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> > > To: papercreters@yahoogroups.com
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> > > Sent: Sunday, January 22, 2012 2:41 PM
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> > > Subject: [papercreters] Papercrete roof panels?
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> > > Has anyone here done a papercrete shed with a papercrete roof?
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> > > Alan in Michigan
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