Originally Posted by Exo
Lots of simple explanations for your problem. The top two are: Give it more time and try not to worry. 24hrs isn't unheard of when you don't use a starter.
The second is that your using a plastic bucket and don't have a perfect seal around the lid. CO2 is escaping in an area of the lid.
I have waited as many as 3 days for signs of fermentation. You're brewing a belgian, and I'm assuming that that means a very high starting gravity. The higher the gravity, the longer you will wait for fermentation.
Did you use liquid yeast or dried? If liquid, how old was it? For every month past the date stamped on the yeast package, you should figure to add one day of lag time in your beer. A yeast starer would eliminate a lot of your lag time, no matter what the cause. Cheers.