Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Help. Low gravity stout FG stalled out to high.
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Old 04-16-2011, 01:49 AM   #1
itchywool
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Default Help. Low gravity stout FG stalled out to high.

OG 1.047 fermented vigorously for 2 days then slowed. Been three weeks and FG is 1.022 and sweet. Too sweet. What happened? Any guesses

LB OZ MALT OR FERMENTABLE PPG L
41% 4 0 Alexander's Pale Extract 32 4
20% 2 0 Flaked Barley 28 2
20% 2 0 Pale Malt (Maris Otter) 37 3
8% 0 12 Roasted Barley - 550L 22 550
5% 0 8 Briess Chocolate 350 L 34 350
5% 0 8 Briess Crystal 80L info 29 80

3 oz. Kent goldings (60)

2 vials White labs dry english ale.

Grains mashed for 1 hour at 155 degrees at ratio of 1.5 quarts water per pound grain.

3 gallon boil. Topped off to 5.5 gallons. Aerated by vigorous shaking for 5 mintues. Fermented at steady 68 degrees.

I have roused the yeast several times.


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Old 04-16-2011, 02:48 AM   #2
Calder
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1.047 puts you at 60% mash efficiency. That's low in my opinion, probably had a problem with fully converting the mash.

My guess is you mashed higher than 155 and got a lot of unfermentables.


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Old 04-16-2011, 04:44 AM   #3
avidhomebrewer
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2 days of vigorous ferment? Not nearly enough. Rouse the yeast and let it go again.
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Old 04-16-2011, 04:54 AM   #4
lumpher
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have you moved it into a warmer area to see if it kicks up again?
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Old 04-16-2011, 10:03 PM   #5
jtakacs
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i have the same problem except mine started at .057 and is stuck at .024... i was heating the mash and got distracted - it spiked to 170 for a while. mine makes sense, this i have no idea... i'm thinking of an amalyse addition but i just tried it today and it tastes great and not overly sweet. i'll be putting it in a barrel so i think that will add some astringency and mask any cloying sweetness... it'll still be flawed, but drinkable fo'sho.


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