Originally Posted by
blue matt
I used to make up custom shaped slabs off site, personally, if the slab is liftable with 2 people, imho its easier
Piece of board ( we used to keep the old melamine kitchen cupboard shelves to use ) timber around the edge the depth you want the slab
paint the inside of the board and timber edge ( so its nice a smooth ) you could just oil it
then pour the concrete into the mold , fill to brim, force into edges, tamp down with a piece of timber, tap the edges to get rid of any air bubbles
the face next to the board would be the top face
though you could smooth the top of the mold ( bring up the " fat " of the concrete ) and that could be the top, you could add colours or sparkle to create a bit of a effect that way
then wait for a week, then tap the mold sides off and slide of board, then lift into place