[papercreters] Re: Reciprocal roof

I'm not confident I know what is standard construction practice in your area and in your climate.

In your area, where do contractors typically put a vapor barrier when they build with standard stick construction? Whatever is standard practice in your area in your climate is what you should look to for guidance as far as where is best to place a vapor barrier in your roof.

You may be in a warmer more humid climate that calls for a vapor barrier to be placed on the outside of the wall instead of on the inside of the wall which is standard in colder climates. I'm simply not certain.

If contractors in your area typically place a vapor barrier on the exterior side of the insulation in your area, then you would be wise to follow that lead. In fact, you my want to abandon using tar paper all together and use a fully sealed plastic vapor barrier.


Following are a couple of good reads on the subject:

Note the discussion of vapor barrier placement as it pertains to geographical climate:
http://www.ornl.gov/sci/roofs+walls/insulation/fact%20sheets/wall%20insulation%20technology.pdf

http://www.ornl.gov/sci/roofs+walls/insulation/fact%20sheets/weather%20resistive.pdf


While I realize you won't be using standard stick framing construction techniques, the scientific research Oak Ridge has conducted concerning vapor retarders will still apply to a papercrete wall, or a papercrete insulated roof.


Here is a pretty good read concerning the strength of various wood species:
http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr190/chapter_05.pdf


I have a dream that one day, we will have a table like that for various different mix ratios of papercrete. That will allow engineers to specify a specific mix for different specific purposes in a structure. When that data becomes available, keeping papercrete out of the building codes will be impossible, and papercrete mixers may quickly become standard construction equipment for every commercial contractor.

--- In papercreters@yahoogroups.com, Garth & Kim Travis <gartht@...> wrote:
>
> Greetings,
>
> How about if we remove the tar paper as we add the papercrete, so the
> papercrete is not sealed from two directions? This worried me as well.
>
> The forty foot diameter is the inside span. The five foot overhang is
> outside the henge. I know it is a large span, that is a concern.
> Sizing the poles for this span is a challenge. However, I so far have
> not found any tables to help. And, I am not sure what math I need to do.
>
> We are planning on aircraft cable into the concrete foundation. It is
> standard on the way we build. I know what wind can do, we have been
> here 20 years and seen lots of disasters. We have built a few buildings
> that have come through 100mph winds that gusted to 130mph.
>
> Bright Blessings,
> Garth & Kim Travis
> www.TheRoseColoredForest.com
> Bedias, Texas
>




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