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Posted by M&S on October 13, 2006, 8:01 am
Italian Mason wrote:
> Most definatly concrete. the smoothness is achieved by a combination of
> vibrating the form and the actual form itself. This can eaisly be
> reproduced using trim moulding (for the edges)and dimentional boards
> 2x4's or whatever thickness is necessary once made the whole thing must
> be caulked and painted (for the smoothness) spraying the forms with a
> dishsoap solution (dawn and water) or straight diesel will keep the
> forms clean and should be good to do several casts. Another option is
> to line the form with painters plastic ( the real real thin stuff)
> before pouring this will produce a irregular texture pattern.
>
> Mark wrote:
>
>>Can anyone tell me how this concrete post cap was created?
>>
>>http://www.canleyworks.com/temp/concrete/
>>
>>Thanks
>>-Mark
>
>
I agree, definitely cast, no trowel touched that piece especially on
the edge profiles.
We have cast cap stones similar to this on a few occasions. Our
technique is much like you have posted. Formwork, caulk,
paint/sand/paint/sand etc. We use an SDS hammer and an old chisel with
the end cut off and a crutch tip over the end to vibrate. We set the
form on thin piece of foam rubber, hold the hammer against the form and
hammer a bit.
If I were going to make several making a master out of hydrocal or some
other very fine plaster and then a latex mold from that master would be
my choice.
Mark
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