I recently had a student create a relatively large relief sculpture, as an independent project. In the standard class, I also have the students make a relief sculpture, but the slabs are only 5.5"X8.5"X.5". So I say "large" because in relation, the independent student's work is pretty big. It's a circular format, with a diameter of 20"X.75-1". When planning the project, he knew he wanted it to be big, so I just had him build it on a spare kiln shelf, to avoid potential breaks, while trying to move and load it.
It's been drying for a couple weeks now, and has no spots, that feel cool. So I'm not worried about residual moisture, but I've heard people suggest placing slabs on a layer of silica sand(?) or clay coils, to avoid stress during the firing. The clay is low fire, so will this be necessary in either firing?
If it were my project, I'd just fire it, and deal with any issues that might arise, but as it's a student's project, and they put a lot of time into it, I don't want anything to happen to it.
Thanks for the help folks.