I had that happen once. I wasn't even thinking and forgot to glue two boards together for a sheet cake it cracked when I picked it up too much weight on the single cake board. I always glue two cake boards together and glue a coordinating ribbon on the sides. That makes the cake boards sturdier and less flexible. Also I think it adds a nice finishing touch. To save on costs I use the remaining raw boards I have as the bottom and a grease proof board to put the cake on.
I agree with the others that it's likely your cake board. I was able to solve that with cake boards from Dallas Foam. I use the 1/4 inch boards and they provide wonderful support.
http://www.dallas-foam.com/cakeboards.html
I still use the flimsy boards for each of the cake layers as they come out of the oven. Then as I am building a tier, I use the sturdier 1/4 inch board.
One more thought ... last year I tested a bunch of yellow cake recipes to see how long they stayed fresh (scratch and WASC), and all of the WASC's that had pudding in the mix cracked from shrinkage.
As others have mentioned, if you board flexes when you lift the cake after the icing has crusted, it will crack. You need to use a sturdy enough board that it won't bend when you lift it. Not holding the board only at the edges can also help, but you can't count on your customers doing that.
I use the half inch foam core boards from Dallas Foam. The work well and half inch ribbon isveastbto find so covering the edge is easy.
robert
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