When making huge cakes it just doesn't make sense to always use just cake. Not only is it a waste to use five times the amount of cake that’s required to feed the guests, but cake is heavy, and a lot of cake is REALLY heavy! So Styrofoam is a perfect swap for cake.
Here are 3 top tips when working with Styrofoam:
1) Styrofoam melts when you use hot glue, so to stick pieces together, sandwich the hot glue between masking tape that has been stuck to the pieces of styro that you’re sticking together.
2) In most cases there will be no need to ganache your styro before covering, just brush sparingly with piping gel in preparation for fondant.
3) Cutting polystyrene is a messy job. Make sure you use protective gear such as a face mask and overalls to keep you and your clothes safe.
Some large cakes will require a centre pole for structural support, especially during transport. For a centre pole, make sure you measure the bottom tiers of cake and halfway up your top tier.
For most cakes a 13mm dowel should do the trick, and it also helps if you cut your dowel to a point at one end. Make sure you don't forget to cut corresponding centre holes in the centre of you cake boards. Dab some hot glue on the base board to secure your centre pole making sure it’s erect and straight.