The 4'x8'x4" panels I made had just enough strength to tilt up and
flip over. After about 10 days of drying with no rain the panels
seemed to be strong enough to add metal framing studs. Once the panels
were incased in studs they could be put in place without concern for
breaking them in transit. I had broken several panels during the tilt
up process until I learned how to recognize when a panel was ready to
flip and do it smoothly with two big levers. A PC mix rich in Portland
and sand would have helped.
As for slip forms I would not use them for walls above 5'. At that
height or greater I make custom armatures out of 3/8" rebar, 6"x6"
welded wire, and 2.5lb expanded metal lath.
I have also built 8' high PC block walls, but that too I found too
time consuming and labor intensive. The block wall results also came
out quite sloppy due to poor craftsmanship on my part.
On Aug 13, 2007, at 3:30 PM, "mountainfair" <yahooposting@dreamthefuture.org
> wrote:
> Can you tell me more about the strength - are you saying that they
> lacked strength?
>
> I am OK working around long dry times, and have a stand in for a fork
> lift that I could use to move large panels around with (might need to
> figure out how to include loops sticking out of the panels to attach
> chains to).
>
> But if strength is an issue, forget it. I was thinking of using
> cattle panel (galvanized rod in roughly 6" squares maybe 1/4 inch dia)
> in the middle.
>
> Did your 4x8 panels break?
>
> Arent you concerned with the weight of wet pc when the slip form is at
> the top of the wall?
>
> -Eli
>
>
>
> --- In papercreters@yahoogroups.com, Mikey Sklar <sklarm-yahoo@...>
> wrote:
>>
>> I have some experience with tilt up 4'x8 panels. It is hard work
>> and I
>> doubt I would do it again despite the good looking fence I got out of
>> the 60 panels that were made. The three problems with large tilt up
>> panels I found were:
>>
>> 1. Moisture (long dry times)
>> 2. Weight (minimum 2 people to move and place 150lb panels.
>> 3. Strength (we reinforced with salt cedar as rebar inside the panel
>> and framing studs on the outside.
>>
>> On future walls I will be building double armatures or make use of
>> slip forms. Combined with a concrete pump or diaphragm pump I expect
>> the work to be a order of magnitude faster.
>>
>> On Aug 13, 2007, at 4:39 AM, "mountainfair" <yahooposting@...
>>> wrote:
>>
>>> Thanks for your replies, Spaceman and Mikey. I am getting a better
>>> picture of all that is involved. Sounds like spraying a
>>> thicker/larger dome is not a good idea, but having a sprayer to put
>>> the final coat/stucco on projects will be important.
>>>
>>> For larger projects, it sounds like casting on the ground would be
>>> easier.
>>>
>>> Any experience casting large panels (like 8' or 10' x 20') and
>>> tilt up
>>> construction? If one could cast an entire wall on the ground, with
>>> doors and windows framed in, this could save a lot of time and
>>> energy.
>>> Would need a loader/lift to pick it up, and some way of attaching
>>> the
>>> panels to the footer and perhaps a beam or something on top...
>>> Would
>>> love to hear if others have any experience with this.
>>>
>>>
>>> -Eli
>>>
>>>
>>>
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
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