poured hearth help

[greenbikemike]

built this fireplace for a friend and she wanted a curved hearth, so I was thinking of pouring it and using a counter top mix but she wants a "chiseled edge" look.....any idea's....I did some google searchs but have'nt found how to get that,
Thanks
greenbikemike

 

[Milton Shaw]

Attach pieces on the inside of the form that have the reverse of the shape she wants and then use a ******** when you pour it to get the concrete to copy the exact shape of the inside cavity. A neighbors house had been done with wood siding on the inside of the form and then when the form was removed the exact copy of the siding was in the concrete. Painted you could not tell it wasn't cedar siding unless you went up and touched it.

 

[uncledeanxc]

I believe you put the negative of the edge you are looking for inside the form.
Something like this:
http://www.expressions-ltd.com/Concrete_Edge_1_5_Inch_Chiseled_Rock_p/crete-edge-1_5in-chisel.htm
The above are rubber and can take the shape of your mold and can be reused.

Another option would be to carve the look into 2 or 3 pieces of wood for that leading of your form. If done in multiple pieces it won't lock onto the part during removal.

 

[greenbikemike]

Thanks for the quick reply,I think [but never tried this] how to pour it using melamine and framing it,but I was hoping someone makes the edging for it,and it has to be flexable because its curved.....
thanks again,
greenbikemike

 

[greenbikemike]

I believe you put the negative of the edge you are looking for inside the form.
Something like this:
http://www.expressions-ltd.com/Concrete_Edge_1_5_Inch_Chiseled_Rock_p/crete-edge-1_5in-chisel.htm
The above are rubber and can take the shape of your mold and can be reused.

Another option would be to carve the look into 2 or 3 pieces of wood for that leading of your form. If done in multiple pieces it won't lock onto the part during removal.

Thats the ticket there,thanks,I was on the phone and by the time I posted,you had the answer,love this place......
GBM

 

[jdieter]

Greenbikemike, nice job, getting ready to do the same style of project as part of a basement remodel on a straight run of wall vs. a corner. Using a similar river rock and wonder how you handled the edge transitions to the drywall with the irregular edge of the river rock.

 

[greenbikemike]

Greenbikemike, nice job, getting ready to do the same style of project as part of a basement remodel on a straight run of wall vs. a corner. Using a similar river rock and wonder how you handled the edge transitions to the drywall with the irregular edge of the river rock.

Thanks,this fireplace is almost identical to the one I built in my house 10 years ago[that's where she got the idea] and I used blue masking tape for an edge and mortared and feathered it in,so far,mine has a few VERY small cracks where it meets,but small as in,a foot away and look'n hard to see'm small.....not a pro by any means,I think mortaring to the end of the sheetrock and then caulking it in would work too.....
good luck and have fun,post up when its done....
GBM

 

[greenbikemike]

I believe you put the negative of the edge you are looking for inside the form.
Something like this:
http://www.expressions-ltd.com/Concrete_Edge_1_5_Inch_Chiseled_Rock_p/crete-edge-1_5in-chisel.htm
The above are rubber and can take the shape of your mold and can be reused.

Another option would be to carve the look into 2 or 3 pieces of wood for that leading of your form. If done in multiple pieces it won't lock onto the part during removal.

Being a COB.....anyone try craving it into 1 1/2 ridgid insulation for my outside edge,I would think it would be easier,and could be bent,but was wondering how to "seal" it so it doesn't pick up a porous finish....just think'n out loud,
thanks
GBM

 

[rburke65]

Could you spray the insulation with a clear release liquid that would seal it and help to get it off the concrete....?

 

[Zeke]

I'm sure you can put something together given time and ingenuity. The product recommended simply removes those factors and makes it super convenient. I mean you could use clay in the mold corner. Just remember that if the finished product has a concave 'break' that you have to carve that as convex. You'd have to be fairly skillful.

You can get some RTV and make the product yourself a short section at a time and join it with clay or wax. As I said, the company that makes that simply helps move the project along.

 

[greenbikemike]

I'm sure you can put something together given time and ingenuity. The product recommended simply removes those factors and makes it super convenient. I mean you could use clay in the mold corner. Just remember that if the finished product has a concave 'break' that you have to carve that as convex. You'd have to be fairly skillful.

You can get some RTV and make the product yourself a short section at a time and join it with clay or wax. As I said, the company that makes that simply helps move the project along.

We checked it out yesterday at Cemstone.....$75.00 a stick......hate to buy it and only use it once,but......but I know what you mean......finish it and move on....too many irons in the fire.....thanks again
GBM