SO i have to fill my cake with chocolate mousse.. Its actually the Costco mousse recipe i found on here.. So i wanted to know if i would be able to use chocolate ganache as my dam and the fill the cake with the mousse.. I will also be crumb coating my cake with the ganache as well.. is this possible ? Please help.. thanks in advance

Sure can!

Absolutely, yes! Just realize it might be more susceptible to warm weather than a dam made from very stiff buttercream.

Thank you guys sooo much !!!! Love cc .. always get answers from you experts thanks again

Looks like you got your answer. I wanted to share that I worked with Ganache for the first time last week and loved it. I followed Angelfood4's tutorial on her blog: http://sugarsweetcakesandtreats.blogspot.com/