overly aggressive fermentation

[thisisbeer]

I brewed 2.5 gallons of beer and put it into a 6.5 gallon glass carboy. Fermentation kicked off and fermented for a little over 30 hours and I needed my fermentation freezer for another beer, so I moved this beer up stairs in the closet ambiet about 70-72. I didn't check on the beer for a couple days and just opened the closet and the krausen came through there air lock. Can't believe that happend on a beer with a starting gravity of 1.030.

 

[E_Marquez]

What yeast?
70-72 is a bit warm for many yeasts... not surprising it blew up..

 

[daksin]

Still, that's a lot of krausen to take up 4gal of space. It probably got warmer.

 

[thisisbeer]

It was Wyeast 1007 German Ale. It may have gotten a little warmer but I was shocked to see it over take 4 gallons of head space and spill out on the floor. I did not picture that happening. I know that yeast like it a little colder but the beer started out at 1.030. I assumed it wouldn't take much time to finish.