4 tier wedding cake - 16" round bottom tier.
What board do you use for the base? Wilton's thickest boards only go up to 18", and I'd rather have 20".
I'd use masonite or 1/2" plywood. My hubby cuts plywood for me and I use it all the time. You can order masonite from GSA.
I'd go for 20 or 22...
I hate the Wilton drums.. they are flimsy. Masonite covered in fondant would be my choice... 1/2" like the PP suggested.
I use cake drums, but not the Wilton ones.
I use drums too... the ones I get from the cake supply store near me aren't the Wilton ones though. They are MUCH more sturdy.
The biggest one they have though is 20", so if I needed it bigger (which I probably wouldn't, but for argument's sake) I'd go with masonite.
Yup, for a 4 tier I'd use a 20. Just to give it a better look and stability. I'm fortunate enough to have a cake supply store near me but you can order them from several online places.