Can I use poured chocolate ganache on top of buttercream iced cake? Any rules I should know about? Thanks!

I have many times. I would let the buttercream crust very well and make sure the ganache is cool. do you want to completely cover the cake or just let it drip down the sides?

Every time I have done poured ganache I did it over chocolate buttercream.

It sounds delicious!

anytime that i have done this method. i ice the cake smooth with b/c . let set up.. the pour warm ganache over the cake, starting in the middle out. this was how i was shown how to use poured ganache.

after pouring ganache on top, the cake then has to be refrigerated, right?

Thanks all! Yes, I am just letting it drip over the sides. I have a bride who wants white buttercream with chocolate ganache covereing the tops of all three layers running down the sides and and decorated with red roses. Sounds great doesnt it?