Papercreters: [papercreters] Re: Papercrete Roof

Wednesday, July 28, 2010

[papercreters] Re: Papercrete Roof

If you're describing a 2 leaf cavity wall there, no vb is needed, the cavity acts similarly to one.

--- In papercreters@yahoogroups.com, "IPMNV" <ipmnv@...> wrote:
>
> I have been following this thread about vapor barrier and have the following
> question;
>
>
>
> There are four areas to which the vapor barrier can be attached. Described
> as follows which is the correct most effective location?
>
>
>
> Inside of inner wall?
>
>
>
> Outside of inner wall?
>
>
>
> Inside of outer wall?
>
>
>
> Outside of outer wall?
>
> Thanks,
>
>
>
> Quentin-E: Thornton
>
>
>
> From: papercreters@yahoogroups.com [mailto:papercreters@yahoogroups.com] On
> Behalf Of countryatheartok
> Sent: Tuesday, July 27, 2010 8:56 AM
> To: papercreters@yahoogroups.com
> Subject: [papercreters] Re: Papercrete Roof
>
>
>
>
>
>
> 30 Yearss ago when I built my 2100 sq ft house, I put a 6 mill vapor
> barrier through out the entire interior of all exterior walls and I
> also did the entire house ceiling. To me at the time the ceiling was
> more important than the walls. It has proved to be a wise decision after
> all these years. I have never had a sweating problem with walls, windows
> or doors, and it gets quite cold here in the winter, sometimes well
> below -zero. I don't know if it is necessary with PC or not.
>
> BTB
>
> --- In papercreters@yahoogroups.com <mailto:papercreters%40yahoogroups.com>
> , "prrr.t21@" <prrr@> wrote:
> >
> > Speaking of buildings in general rather than papercrete
> specifically...
> >
> > In a damp climate its necessary to use a vapour barrier on the
> interior side of walls, otherwise as damp interior air cools on its way
> outward it condenses, and water builds up.
> >
> > On occasion people add a vb on the outside to damp walls in the
> mistaken belief it'll stop rain soaking in. It may do, but it also
> prevents evaporation, resulting in greater dampness in the wall.
> >
> > Warm interior air holds much more water vapour than even wet outdoor
> air in winter, hence the dew point is reached when it cools. The vapour
> flow in housing walls is from interior out, not the other way. (If it
> were the other way, houses would flood.)
> >
> >
> > Another damp problem happens when a wall has insufficient insulation
> to prevent condensation occurring on the interior surface. Only a very
> small amount of insulation is needed to stop this though, at least here
> down to -20C, so I doubt that would be an issue with papercrete, unless
> you're building somewhere extremely cold.
> >
> >
> > NT
> >
> >
> > --- In papercreters@yahoogroups.com
> <mailto:papercreters%40yahoogroups.com> , "ndgogiraf" ndgogiraf@ wrote:
> > >
> > > 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
> <mailto:papercreters%40yahoogroups.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#
> <http://picasaweb.google.com/owlswamp/HobbitHouse> )
> > > >
> > > >
> > > > After reading "Latex Concrete Habitat"
> > > >
> http://books.google.com/books?id=Uu11_JPY83UC
> <http://books.google.com/books?id=Uu11_JPY83UC&dq=latex+concrete+habitat&pri
> ntsec=frontcover&source=bn&hl=en&ei=vGtLTNjMOoK78gbt0Ywz&sa=X&oi=book_result
> &ct=result&resnum=4&ved=0CCkQ6AEwAw#v=onepage&q&f=false>
> &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
> > > >
> > >
> >
>