My garage floor is very rough, with stones and all sorts in it. On one side of the garage, where a wall was modified, the conctrete has been raised by 35mm for some reason.
I was about to do formworks and rasie the floor with conrete by 50mm (would be 15mm where the concrete is already higher). I was going to do it in four sections to make the job more manageable.
But from what I've now read on forums, putting a layer of concrete on top of an existing layer is not recommended because it doesn't stick to the layer below and because it expands at a different rate. But none of the texts I read stated how thick the new layer would need to be so that it doesn't crack.
Will I have to remove the old slab?
I was about to do formworks and rasie the floor with conrete by 50mm (would be 15mm where the concrete is already higher). I was going to do it in four sections to make the job more manageable.
But from what I've now read on forums, putting a layer of concrete on top of an existing layer is not recommended because it doesn't stick to the layer below and because it expands at a different rate. But none of the texts I read stated how thick the new layer would need to be so that it doesn't crack.
Will I have to remove the old slab?