I brewed an Imp American Stout using Lallemand Voss Kveik yeast. OG was 1.088 (adjusted for temp) and it finished at 1.026 (adjusted for temp). I used a recycled slurry, and even added another pack, yet that was the FG. It doesn’t taste underfermented. But not an Imp Stout. Thoughts?
You got 70% attenuation from a grain bill, I’m assuming to be, high in adjuncts. I’m not familiar with Voss, but it seems respectable to me.
Have you brewed this beer with this yeast before?
Yes I have, but not with this yeast. My app said 66% apparent attenuation. Thus the question. It was confusing why it seemd to not fully ferment, yet not have any residual sweetness. Thank you for the input. Cheers.
I’ve had LalBrew Voss quit at 61% and go all the way to 78% apparent attenuation. So I think it just comes down to the fermentability of the wort.
What was the grain bill?
What was the mash schedule?
What attenuation did you get with the other yeast?
I never trust attenuation estimates from an app. There are too many variables.
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That’s not an unusual FG for a high gravity beer. Take what you got and be happy about it. Someone once said we don’t make numbers, we make beer. Don’t get too hung up on matching the numbers especially if the end result is a beer that tastes good to you.
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I’m no expert on this, but my two cents…
I’ve brewed 3 Imperial Stouts (OG 1.074-1.088) over the past year and my attenuation (using Safale S-04 and US-05) have all been right at 77-78%, at the low end of the yeast’s apparent attenuation but totally acceptable.
I notice that Lallemand Voss Kveik has a “very high” flocculation. This could be making a difference - see Brad Smith’s blog “Apparent and Real Attenuation for Beer Brewers – Part 2”.
I agree with Kevin. My stouts all finish above 1.020 (around 5 degrees Plato) because of all the unfermentables that are in the grain bill. Not to worry, if it tastes good and not sweet you are OK. Just make a note that if you want the ABV to be higher add more base malt or DME to the kettle to bring the pre-boil gravity up. As Denny said, there are too many variables with calculated FG values to trust the software numbers.
Thank you all for the feed back. Really appreciated.