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Old 09-19-2009, 12:20 PM   #1
GrantLee63
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Default Oatmeal Stout - High FG

Any thoughts as to why my stout finished with such a high FG? I've made this recipe several times and never experienced this before - S-04 has always given me excellent results. Fermentation temps were in the 65-68 degree range. Made it on 09/04 and kegged it today - 09/19.

Here is my recipe:

Oatmeal Stout

Type: All Grain
Date: 9/4/2009
Batch Size: 5.75 gal
Brewer: GrantLee63
Boil Size: 8.05 gal Asst Brewer:
Boil Time: 90 min Equipment: My Equipment
Taste Rating(out of 50): 0.0 Brewhouse Efficiency: 80.00
Taste Notes:

Ingredients

Amount Item Type % or IBU
6.00 lb Pale Malt, Maris Otter (3.0 SRM) Grain 57.14 %
1.75 lb Barley, Flaked (1.7 SRM) Grain 16.67 %
1.75 lb Oats, Flaked (1.0 SRM) Grain 16.67 %
1.00 lb Roasted Barley (Crisp) (695.0 SRM) Grain 9.52 %
1.00 oz Fuggles [4.50 %] (60 min) Hops 14.8 IBU
1.00 oz Fuggles [4.50 %] (30 min) Hops 11.4 IBU
1.00 tsp Fermcap-S (Boil 90.0 min) Misc
1.00 tsp Irish Moss (Boil 15.0 min) Misc
1.00 tbsp pH 5.2 Stabilizer (Mash 60.0 min) Misc
1 Pkgs Safale (Fermentis #S-04) Yeast-Ale


Beer Profile

Est Original Gravity: 1.053 SG
Measured Original Gravity: 1.050 SG
Est Final Gravity: 1.015 SG Measured Final Gravity: 1.024 SG
Estimated Alcohol by Vol: 4.94 % Actual Alcohol by Vol: 3.39 %
Bitterness: 26.1 IBU Calories: 229 cal/pint
Est Color: 40.9 SRM Color: Color

Mash Profile

Mash Name: Single Infusion, Medium Body, No Mash Out Total Grain Weight: 10.50 lb
Sparge Water: 5.69 gal Grain Temperature: 65.0 F
Sparge Temperature: 168.0 F TunTemperature: 65.0 F
Adjust Temp for Equipment: TRUE Mash PH: 5.4 PH

Single Infusion, Medium Body, No Mash Out Step Time Name Description Step Temp
60 min Mash In Add 16.50 qt of water at 170.1 F 154.0 F

Mash Notes: Simple single infusion mash for use with most modern well modified grains (about 95% of the time).
Carbonation and Storage

Carbonation Type: Kegged (Forced CO2) Volumes of CO2: 2.5
Pressure/Weight: 27.6 PSI Carbonation Used:
Keg/Bottling Temperature: 68.0 F Age for: 7.0 days
Storage Temperature: 38.0 F

Notes

09/19/2009 - Experienced a very low attenuation which is unusual with S-04. I do not know why. Kegged nonetheless.



Thanks - GL63

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Old 09-19-2009, 12:22 PM   #2
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All I can guess is yeast health and maybe that 3 degree swing in temp.

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Old 09-19-2009, 01:23 PM   #3
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What was your mash temp? This could have alot to do with it. Never the less this will be a great beer!

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Old 09-19-2009, 02:31 PM   #4
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Mash temp was 154 and the yeast had an expiration date of 03/2011

- GL63

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Old 09-19-2009, 05:03 PM   #5
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1.75 flaked barley + 1.75 oats can be a lot

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Old 09-19-2009, 06:49 PM   #6
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+1 to the oats and barley, its a little heavy.

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Old 09-19-2009, 07:54 PM   #7
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Thanks for the feedback guys .... why would that amount of flaked oats and barley result in a higher FG?

- GL63

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Old 09-19-2009, 08:33 PM   #8
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Did you do an iodine test at the end of your mash?

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Old 09-19-2009, 08:40 PM   #9
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Quote:
Originally Posted by GrantLee63 View Post
Thanks for the feedback guys .... why would that amount of flaked oats and barley result in a higher FG?

- GL63
They create more complex(unfermentable) sugars.I think it'll be good though.I just made an oatmeal stout with 2lbs. of oats.I mash low to balance out the body which no one will agree with me on this method,But I get complements on the beer
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Old 09-19-2009, 08:43 PM   #10
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Quote:
Originally Posted by GrantLee63 View Post
Thanks for the feedback guys .... why would that amount of flaked oats and barley result in a higher FG?
You said in the OP that you have made the same recipe in the past with a lower FG so if the grain bill hasn't changed the FG shouldn't really change.
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