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Old 02-28-2011, 11:43 PM   #1
deremer
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Default Is 1.020 to high

I brewed an Alaskan Amber Clone 15 days ago and the gravity has been siting at 1.020 for the last 7 days. Here is the recipe

8.25 lbs. 2-row
1 lb. Crystal 40L
6 oz. Crystal 90L
11 oz. Crystal 60L

Mashed for 60 minutes at 154 and fell to 153
Fly sparged at 170
60 minute boil then racked to primary after cooling then mixed in Winsor
Ale dry yeast. The fermentation temp has been 67-70 degrees. My target OG was 1.052 and ended up at 1.057. The recipe calls for a FG of 1.012. I gave it a stir a couple of days ago and did nothing. So should I keep waiting, repitch some yeast, or just move along in the process and rack to the secondary.

As I am writing I started to think my hydrometer may be off, but I checked it with water and it read right at 1.000

Ben

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Old 03-01-2011, 12:15 AM   #2
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What yeast are you using? Your final gravity will typically depend on the yeast attenuation capability, along with what its ABV tolerance is. If the ABV is reaching its tolerance, it will probably be slow to chew up sugars. That is unlikely though as you are sitting at about 4% ABV with a 50% actual attenuation (61% apparent). Most yeast should still chunk away on it, but if you underpitched, you may need to repitch or wait a few more days to see where you are at.

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Old 03-01-2011, 02:40 AM   #3
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have you checked your thermometer? even if you mashed higher, you should still be under 1.02, but that may be able to explain it

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Old 03-01-2011, 02:50 AM   #4
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You've got about 20% crystal malts in there. 1.020 sounds about right.

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Old 03-01-2011, 02:57 AM   #5
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I'm thinking that you may need to recalibrate your thermometer. 154F seems a bit high, and will make some unfermentable sugars. If your thermo is off, it could throw you off, causing the FG to read high.

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Old 03-01-2011, 05:28 AM   #6
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When all else fails do what I have done for many years: Let it sit another couple weeks, the math becomes anecdotal.

i.e. let it do it's thing and then add another couple weeks and you won't have to worry about anything.

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Old 03-01-2011, 05:31 AM   #7
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I'm thinking that you may need to recalibrate your thermometer. 154F seems a bit high, and will make some unfermentable sugars. If your thermo is off, it could throw you off, causing the FG to read high.
154F isn't THAT high but combined with 20% crystal malts I think 1.020 is not very surprising.
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Old 03-01-2011, 05:34 AM   #8
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Haven't used Windsor in a long long time, but it's notorious for under-attenuating. As stated before though, that's a lot of crystal.

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Old 03-01-2011, 05:50 AM   #9
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154F isn't THAT high but combined with 20% crystal malts I think 1.020 is not very surprising.
+1. I agree. The crystals you used are also on the mid to darker side. Darker crystals have less fermentables than light ones such as crystal 15 or carapils. So if you had used the same amount of only carpils, your batch would have fermented drier. Just another aspect to consider.
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Old 03-01-2011, 11:45 AM   #10
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154F isn't THAT high but combined with 20% crystal malts I think 1.020 is not very surprising.
No, you're right. 154F isn't high, but if the thermo is off by 5 degrees, that could bring the actual mash temp up. I recently had that problem, that's why I posted.
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