On Dec 7, 8:05*pm, Joe wrote:
On Dec 7, 12:41*pm, gregory wrote:



hello,

I want to build a fake rock outdoors (example this erratic block:http://gsc.nrcan.gc.ca/landscapes/ph...et/img0049.jpg)
the size is 6 x 8 m and about 5 m high. it will be hollow and will be
accessible as a kind of cave.
I admit I have never worked with concrete. (I'm rather a wood
specialist)

I imagined to build a frame of iron and then spray the concrete on
both sides for a total thickness of about 15 to 20 cm.

I do not know if I need to build foundations?
is there a problem of humidity, venting?
how hard is it to do a nice finish of fake rock?
is only 15 cm thick enough?
How do I estimate my time for the production of such a piece?
where do I find a basic builder vocabulary ?
any good source book for me to read this winter?

I am looking for general advice, errors from beginner to avoid tricks,
corporations and others.

see you,
gregory

In marine applications this is called ferrocrete. In construction,
like swimming pools and trick roof sections it is Gunnite. Start there
and keep going in your research until you feel competent to talk to
professionals in the field. They are the people who can answer your
questions.
BTW, why the antipathy for corporations? You'll be dealing with them
in your project, as well as bureauocrats (think building permits).

Joe



thanks for the infos.
hehe! corporation is the wrong word. (my happy frenglish google
translation!)
i am in fact asking about possible addresses of companies specialised
in the subject.

g