Author Topic: Safale S-04 Low Attenuation (59%) at 60F  (Read 2019 times)

Offline purduekenn

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Safale S-04 Low Attenuation (59%) at 60F
« on: October 23, 2018, 09:23:05 PM »
Brewed a Sweet Stout using Safale S-04 that was direct pitched in wort at 70F. Beer was placed in a fermentation chamber to get to 60F. This is the first time at 60F fermentation temperature for me using this yeast. OG was 1.057 and gravity is at 1.023 for 3 days now. I think it is finished. The beer was brewed on 10/17/18. Tastes great with Centennial  and Willamette hops. Wondering if anyone else has experienced low attenuation with this yeast.
Grain Bill for a 5 gallon batch:
6 pounds 2row
12 oz flaked wheat
8 oz chocolate malt
6 oz Carafa special II
6oz Simpsons Coffee Malt
8oz English Medium Crystal
1pound Lactose

Offline Iliff Ave Brewhouse

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #1 on: October 23, 2018, 09:41:19 PM »
me thinks the lactose has a lot to do with it. That FG is within the style guidelines.
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Offline Richard

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #2 on: October 23, 2018, 09:42:14 PM »
The lactose is not fermentable. I did a quick BeerSmith calculation and if you mashed at 156, then it predicts exactly what you got.
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Offline purduekenn

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #3 on: October 23, 2018, 09:53:24 PM »
Thanks for the comments I mashed at 152F. Beer Smith said FG should be 1.010. And I took in to account that Lactose is not fermentable.
« Last Edit: October 23, 2018, 09:55:42 PM by purduekenn »

Offline Robert

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #4 on: October 23, 2018, 10:49:12 PM »
The crystal and roast also don't contribute signicicant fermentables.  S-04 is typical of English ale yeasts in that it does not ferment the sugar maltotriose, so even in a typical base malt wort you should only expect ~70% ADF.  Mashing lower and longer might have dried it out a bit more, but not much.  Looks perfectly normal.  Direct pitching at 70° and moving to 60° in the FC is a sound strategy.
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Offline purduekenn

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #5 on: October 24, 2018, 12:29:29 AM »
Thanks for all of the comments  :)

Offline Iliff Ave Brewhouse

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #6 on: October 24, 2018, 02:06:50 PM »
FWIW, I normally average about 78% attenuation with S04 however I normally use very little crystal malt and have never used lactose in my beers.
On Tap/Bottled: Dunkel, Lozacca Lager, Iliff IPA, Red Rye

Fermenting:
Up Next: Light Lager, Maibock, IPA

Offline purduekenn

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #7 on: October 24, 2018, 02:48:08 PM »
I got 74% attenuation with S-04 last time when I made a Surly Bender Brown Ale all-grain clone beer. It had about 15% Crystal Malt. But it was about a 6% beer with more base malt. So far I have like S-04 a lot  :)

Offline Iliff Ave Brewhouse

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #8 on: October 24, 2018, 04:12:34 PM »
I got 74% attenuation with S-04 last time when I made a Surly Bender Brown Ale all-grain clone beer. It had about 15% Crystal Malt. But it was about a 6% beer with more base malt. So far I have like S-04 a lot  :)

Good to hear. I haven't used it in a bit but like it as long as ferment in the low to mid 60s. I don't care for it if gets near or above 68F.
On Tap/Bottled: Dunkel, Lozacca Lager, Iliff IPA, Red Rye

Fermenting:
Up Next: Light Lager, Maibock, IPA

Offline weazletoe

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #9 on: November 10, 2018, 03:41:11 PM »
O4 was always my go to for any porters or stouts. I like the sweeter finish it leaves from the under attenuation.
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Offline BrewBama

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #10 on: November 17, 2019, 01:56:12 AM »
I am fermenting a Golden Ale now and I have the opposite problem: OG 1.052 and I’m now sitting at FG 1.006. I expected something like 1.014. This is measured by Tilt so I have to verify but early returns are interesting.


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Offline tommymorris

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #11 on: November 17, 2019, 03:30:06 AM »
I am fermenting a Golden Ale now and I have the opposite problem: OG 1.052 and I’m now sitting at FG 1.006. I expected something like 1.014. This is measured by Tilt so I have to verify but early returns are interesting.


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Do you suspect Tilt is inaccurate? I calibrate my tilt in water but I don’t have a hydrometer to compare. My gravities have all been low lately but the beers have been great.

Offline dmtaylor

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #12 on: November 17, 2019, 03:37:42 AM »
The Tilt goes inaccurate if there is any crud stuck to it... which usually at end of fermentation, there is.
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Offline BrewBama

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #13 on: November 17, 2019, 12:38:13 PM »
I’m not sure yet. I will have some time later today to verify by bottling (FG) hydrometer. I’ll inspect the Tilt to see the crud level.


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Offline Visor

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Re: Safale S-04 Low Attenuation (59%) at 60F
« Reply #14 on: November 17, 2019, 04:02:48 PM »
   I recently split an ESB between S-04 and US-05, the 04 finished at 71%AA and the 05 at 78%. TFWIW.
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