[Noisebridge-discuss] Made at Noisebridge - Concrete Stove

girlgeek girlgeek at wt.net
Wed Sep 4 16:53:45 UTC 2013

Hi Frantisek,
One good way to make the top is to build a mold of formica with the 
smooth side facing in so that you will have a nice smooth surface to 
pour  the top into.  You are working upside down here. If you want any 
includes at the surface then they go in first. It's an upside down 
cake.  A nice smooth mold surface will save you a LOT of sanding & coughing.

The tensil strength of concrete is not particularly good.  You will need 
some metal or wood below the surface level.  I don't know what they are 
called, but there are meshes of rebar type metal that you can use for 
the strength layer.

At the end it is a matter of attaching the table top to the legs. You 
probably want to imbed some attaching mechanism into the top and/ or 
legs while you are pouring. I recommend thinking this step through 
completely before you start.

You may wish to use the same sort of formica boxes for the leg mold.

Don't forget a release material.  I don't know what kind of release 
agent is needed for cement.

hth,  all the best to you there in Korea,

On 9/4/2013 6:20 PM, Rikke Rasmussen wrote:
> +1
> It looks amazing! Rockin' job, Jarrod!
> On Wed, Sep 4, 2013 at 11:20 AM, jarrod hicks <hicksu at gmail.com 
> <mailto:hicksu at gmail.com>> wrote:
>     I started by watching several youtube videos explaining the
>     process of creating concrete counter tops in various ways.
>     I ended up choosing quikrete 5000 for concrete. This comes in 60
>     or 80 pound bags with cement, sand, and a small rock aggregate
>     already mixed together. Only water has to be added. We used a
>     pretty dry mix that was hard to work with, but should turn out
>     strong. The concrete layer is at least 2" thick, some of the
>     videos I saw said one could get away with 1.5" thick.
>     We used a welded wire concrete reinforcing mesh inside the
>     counter-top about 1/2" from the bottom of concrete. Most
>     instructions recommended using reinforcement to control cracking.
>     Although I couldn't find it nearby, another recommended
>     reinforcement material was masonry block ladder wire.
>     The forms were attached to the table, protected with polyurethane,
>     and we poured directly onto it. The other popular way of making
>     these counter tops is to pour into a form that is separate from
>     the counter so that the nice flat bottom of the form becomes the
>     nice flat top of the counter.
>     After removing the forms, I patched any large voids with pour
>     stone. If we used a slightly wetter concrete mix and more
>     vibration we probably could have greatly reduced these.
>     The top was finished using hand trowels during the pour and a
>     masonry grinding wheel with our grinder/polisher after 7 days of
>     curing. Then covered with a generous coat of penetrating concrete
>     sealer.
>     Cheers
>     On Wed, Sep 4, 2013 at 3:46 AM, Frantisek Apfelbeck
>     <algoldor at yahoo.com <mailto:algoldor at yahoo.com>> wrote:
>         Hi Jarrod,
>         Thanks a lot for the info! I'm actually going to build table
>         with concrete top in next few days and it is my first time. I
>         wonder could you recommend me how shall I approach the top
>         concrete layer? Is it just cement mixed with water no sand no
>         iron for strengthening? How thick do you think I should go?
>         There is no stove in it, the propose of the table is to serve
>         as a preparation place handling however hot stuff (it is
>         suppose to handle the thinks coming out of the oven). Also I
>         wonder what is the concrete finish which you are mentioning in
>         the how to?
>         The table is going to be used in a small hostel here in Jeju
>         (island South of South Korea - part of the country) next to
>         the concrete oven which I helped to build. I'm one of the
>         cofounders of Tastebridge so it is really nice to see any
>         project like this to help to keep the food hacking in the game
>         in the place!
>         Many thanks for any info and your time and effort with the
>         project!
>         Sincerely,
>         Frantisek Algoldor Apfelbeck
>         biotechnologist&kvasir and hacker
>         http://www.frantisekapfelbeck.org
>         "There is no way to peace, peace is the way." Mohandas
>         Karamchand Gandhi
>         ------------------------------------------------------------------------
>         *From:* jarrod hicks <hicksu at gmail.com <mailto:hicksu at gmail.com>>
>         *To:* NoiseBridge Discuss
>         <noisebridge-discuss at lists.noisebridge.net
>         <mailto:noisebridge-discuss at lists.noisebridge.net>>
>         *Sent:* Wednesday, September 4, 2013 10:10 AM
>         *Subject:* [Noisebridge-discuss] Made at Noisebridge -
>         Concrete Stove
>         Here is some photo documentation of the new stove that I
>         installed yesterday. Big thanks to all that helped, and those
>         that resisted writing their names in the concrete while it cured.
>         https://noisebridge.net/wiki/Concrete_Stove
>         <https://noisebridge.net/wiki/Concrete_Stove>
>         Cheers.
>         (If anyone feels the urge to send some cash my way to help
>         offset the materials cost, that would be sweet and it would
>         likely end up spent on the next Noisebridge improvement
>         anyway. No worries though, it was a fun project.)
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