Lager Fermenation and Volume

[lmbollinger]

Started my Oktoberfest yesterday (1.062 OG). My boil volume was high, so I racked about 21 Liters (plus 2L starter) into my 24.5L carboy and pitched yeast (WLP860). Optimal temperature range is stated as 9-11C. I'm trying to ferment low to avoid a giant mess in my fermentation chamber. Right now, I'm at 6C and the yeast seem active. What's the lowest you've been able to ferment a lager successfully? How much headspace did you actually need?

 

[Caramel Ox]

Can you fit a blow off tube instead of an airlock?

 

[lmbollinger]

I did use a blowoff and everything is going well so far! Looking again, I may have over estimated my volumes. Still, full enough I was worried about headspace. I ended up transferring some to a growler before pitching. I figure I can dilute it and have a starter for the next batch