I'm making a sheetcake for the first time. Its just a small 9x13, and I needed to know what size board and box I would need for it. In my Wilton's class we've only done round cakes and the rule was to use a board 2inches larger then the cake to allow room for decoration--is this the case with sheetcakes also--if so what size board would I need? I've been using the show and serve boards. Also I've been reading on some of the other boards about sheetcakes splitting--with a cake this size is this something I would need to worry about?
Make sure your board is sturdy. For this size, I triple my cake board...it seems to hold up fine for me. Of course it depends on what you have on it. I just use bc.
I try to use a 10 x 14 with this size. Unless I'm doing a large border or writing on the board.
You will need a 1/4 sheet cake box to put this in. Check the measurements on the box before you get your board.
If you were making a large cake, full size...I would recommend plywood-that's what I use. But with a 9 x 13, you'll be fine tripling your boards. If you feel insecure about that, quadruple it.
Best of luck to you!
Hi! I just made sheetcakes for the first time a few weeks ago. You do want boards that are 2 in bigger than the cake - or at least 1 inch. You also want to make sure you use more than one board b/c the cake can be a little heavier. I used at least 1 board the SAME size as the cake, and then at least 2-3 boards that were an inch or more bigger than the cake. As for boxes, I would think you could get a half sheet box. I think Wilton makes boards that are at least 9x13 - or you could also get larger boards & cut them.
As for baking, you may want to put one flower nail upside down in the middle of the cake pan. Put your flour & crisco, (or I use Wilton's Cake Release) down in the pan, cut a piece of parchment paper to fit, put the nail in the middle of the pan and poke it up through the parchment. Then make sure to use the cake release on top of the parchment paper as well. The flower nail works like a heating core - it helps the cake cook more evenly so that you don't end up w/ well cooked edges & a mushy middle 
Good luck & HAPPY BAKING!
You can also use foamcore boards as a sturdy base. They're my favorite base to use.
I don't think there are any "rules". Do whatever you think looks good! (I like to leave enough space for a nice edge)
For large sheet cakes, I use 3-4 boards. I hot glue them together, and then cover them with either fancy foil or contact paper, depending on the occasion.
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