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Roofing

 
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Can you use plaster for a roof? Are there any hard waterproof plasters?
 
pollinator
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Not the gypsum based material.
In the Middle East mud plaster roofs are common, but there is not a lot of rain about.
 
pollinator
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While I don't know if it's used for roofing, lime plasters like tadalakt are waterproof.
 
Franak Ostapowicz
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I live in arkansas so would definitely need something totally water proof
 
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I came across this recently where this guy uses materials/ideas from bathroom/shower applications and applies it to a little cabin thing he is building:

https://youtu.be/FNC6ijU7pPA?t=1645

I set video to start at the point where he introduces what he is using: "Schluter Kerdi waterproof membrane".
 
Franak Ostapowicz
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This is cool but I don't think will work for a roof.
 
pollinator
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I tend in a different direction that some (most?) permies people with regards to things like this.  People are naturally drawn to trying to find a natural product for the task at hand, in this case roofing.  The problem, in my mind, is that the very products that were developed and implemented these days in roofs came about because of the problems with using natural materials.  If you want your building to last, you must keep it dry.  Even people that draw heavily from natural materials for building use other materials when necessary.  The late, great Mike Oehler used EPDM pond liner for roofs, because it worked.  I don't know of a natural material that will work nearly as well, so in instances like that, I try to use previously-used materials of modern manufacture.  It isn't hard to find used rubber sheeting for free, or nearly so.  Many times it will have small tears or whatnot.  So what?  If you get the material free, use twice as much and overlap it heavily.  It has already been manufactured.  If I use it after it has been discarded, I save it from the landfill, and no new roofing material was manufactured because of my use.  I use what I get locally, so there is no additional shipping or associated fuel or human costs involved.  It isn't a natural material, but it is lessening the environmental impact.  And you will have a roof that doesn't leak, rather than spending lots of time and effort trying a natural material that may or may not leak.  Just one man's opinion.
 
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