I think it depends on the outside temperature, inside humidity and insulation of the roof. Does it get really cold there?
If it is very cold outside and cold enough on the inside layer of the roof vapor barrier such that the humidity inside will condense on that barrier,
AND
there is not enough papercrete to insulate the inside air humidity from this vapore barier so that the temperature differenc of the moist air when it finally reaches the barrier through the papercrete is ... something about the dew point.
Basicly, if you have enough insulation (papercrete or whatever) between the inside of the room and the outside vapour barrier, so that by the time the moist air reaches the vapore barrier through the papercrete , as it moves through it changes it's ability to hold water so it will change it's tendency to condense on colder surfaces, and you will be fine. However if the insulation between the inside warm humid air and the cold inside of the roof is not enough there may be condensation (the dew point will be reached?) and mold may form on the innermost areas of the paper crete....
I think.
Was hoping some one who knew this stuff better than me was going to reply.
Dan
--- In papercreters@yahoogroups.com, Pack McKibben <gakayaker@...> wrote:
>
> I need some input on papercrete roof's.
> I'd like to know what folks have been doing as far as water
> proofing. My papercrete roof has, pretty much, always leaked
> to one degree or another over the years
> ( http://picasaweb.google.com/owlswamp/HobbitHouse# )
>
>
> After reading "Latex Concrete Habitat"
> http://books.google.com/books?id=Uu11_JPY83UC&dq=latex+concrete+habitat&printsec=frontcover&source=bn&hl=en&ei=vGtLTNjMOoK78gbt0Ywz&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCkQ6AEwAw#v=onepage&q&f=false
>
>
> I painted a Latex Concrete slury mix over my Hobbit House papercrete roof. No
> more leaks!
>
> My question is....What do y'all think? Do you think the papercrete won't breath
> anymore
> and I'm looking at future problems? The LC roof has been on for three months
> and I
> don't see any mold.
>
> Have you (if you've built a PC roof) been happy with it? What problems did you
> have?
> if any
> PackyMcK
> PackyMcK
>
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