Hello,
I want a concrete kitchen countertop with cutouts for a sink and a cooktop. I was thinking of making the mold out of, for example, a chipboard where I make cutouts that I then fill with Styrofoam and then a frame around the chipboard. I then place the mold on top of the cabinet units and cast on it. Why is this a bad idea? I've searched everywhere and haven't come across anyone who has cast it in place...
I want a concrete kitchen countertop with cutouts for a sink and a cooktop. I was thinking of making the mold out of, for example, a chipboard where I make cutouts that I then fill with Styrofoam and then a frame around the chipboard. I then place the mold on top of the cabinet units and cast on it. Why is this a bad idea? I've searched everywhere and haven't come across anyone who has cast it in place...
Why does it become difficult to achieve a good surface?
I have read Finja's but haven't seen anything about site-casting.
The reason why I prefer to site-cast is to avoid lifting the countertop later and risking it breaking at the narrow spots...
I have read Finja's but haven't seen anything about site-casting.
The reason why I prefer to site-cast is to avoid lifting the countertop later and risking it breaking at the narrow spots...
Let the chipboard remain. Sawing the overhang might work? I was thinking of placing plywood under the chipboard and extending it outwards, then around the chipboard. The "frame" will thus not be flush with the chipboard. I'll cast around the chipboard so it's not visible and then remove the plywood. Is it clear as glass? 
What are the dimensions of the skivan?
If you want to achieve a nice and smooth surface, you need to sand the concrete, and the edges should be rounded/beveled to a nice shape. There is also a risk that the surface may become uneven on the top of the edges between the mold and the concrete, but if you're planning to sand the slab anyway, it might be possible to fix. So plan on renting a concrete sander with an efficient vacuum cleaner for that work.
Length along the wall is 300, 180 cm at an angle. Depth 64, thickness?
The cooktop should be placed in the corner where the line curves 45 degrees and then 45 degrees again.
The chipboard is jointed with approximately the same dimensions but with a depth of 60 cm.
The cooktop should be placed in the corner where the line curves 45 degrees and then 45 degrees again.
The chipboard is jointed with approximately the same dimensions but with a depth of 60 cm.
Particleboard isn't exactly ideal for casting on, is it? Wouldn't it absorb the water a bit too quickly from the concrete?
What are your requirements for finish?
Almost exactly the same dimensions as mine. I'm also considering site-casting now. The question is whether to lay a chipboard or MDF board that you then cover with construction plastic and up onto the wall. If you cast about 4 cm with reinforcement, it should be stable in itself. Mine is 3m angled and then 2.7 m. I'm wondering if it might crack?