Low Attenuaion on Stout

[CRoth36]

So I recently brewed an oatmeal stout and used WYeast 1968. My OG was 1.064. After 3 weeks I checked the FG and it was 1.022. This made the beer more sweet, which isn't a problem to me since I like sweet beers. I was wondering if it is possible to bottle it at this FG or would I risk bottle exploding? I would rather bottle then pitch more yeast if I can get away with it. I should probably also mention that it was an all grain batch and I mashed at 160. I know that this would result in more unfermentables which would have contributed to the lower attenuation

 

[WoodlandBrew]

Yes, it is safe to bottle if two readings two days apart said 1.022, and yes, the 160 mash temp is the majority cause. Looks good!

Here is some information on detecting final gravity:
http://woodlandbrew.blogspot.com/2012/11/when-has-my-beer-finished-fermenting.html

And how to predict it:
http://woodlandbrew.blogspot.com/2012/11/how-to-calculate-fermentation-time.html

 

[CRoth36]

So if I'm to bottle still add priming sugar like I usually would?

 

[WoodlandBrew]

So if I'm to bottle still add priming sugar like I usually would?

You got it. The sugar that is left the yeast cannot ferment

 

[sweetcell]

another contributing factor might have been the crystal malts in the recipe. most stouts have a lot of chocolate, dark crystal, black patent, etc... those all leave behind a lot of unfermentable sugars.

So if I'm to bottle still add priming sugar like I usually would?

yes. if you're certain that fermentation is over, then there are no sugars left for the to yeast to eat. you need to add sugar if you want the yeasties to carb the beer.

 

[WoodlandBrew]

Double post

 

[CRoth36]

Fermentation should be complete. I made a starter like usual before I pitched the yeast. Fermentation took of like crazy and I kept the temp at the recommended temp for yeast strain. Also after three and had weeks I've got two speedster FG readings that are the same. Thanks for your guys help. Appreciate it.

 

[mgortel]

i would expect a stout to finish at higher OG.....the stout I brewed last week is suppose to finish at 1.023