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Old 12-10-2012, 05:14 PM   #1
bierandbikes
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Default Safale S-05 high attenuation

I brewed what I intended to be a pale ale. As I refine my techniques, my brewhouse efficiency keeps increasing, so I ended up with an OG of 1.062. A bit higher than expected, but okay. However, I was concerned about using a single packet of S-05. I rehydrated just to be sure. Last night I bottled and my FG was 1.008! That is over 87% attenuation. I was expecting something around 1.017. So now, instead of an ABV of 5.5%, I am at over 7%. That should keep everyone happy at Christmas dinner.

What did I do to get such a high attenuation or is this normal? I am going to bottle an IPA tonight that I also fermented with S-05 (2 packets) and expect to be around 7.5%. If I get the same attenuation, I'll be at 9%. I have it calculated at about 85 IBU, so no worries, but I like to have better control over the end product.


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Old 12-10-2012, 05:23 PM   #2
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Sounds par for the course. I kept upping my mash temp and S-05 continued to chomp through and finish at 10 pts, regardless of OG. I use to worry about it, but for my APA/IPA's it's quite perfect actually, S-05 knows what she's doing and takes care of business.


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Old 12-10-2012, 06:29 PM   #3
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I've had several batches finish at 1.005 using S-05.
That was mostly due to 150* mash temp & adding a little brown sugar.
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Old 12-10-2012, 06:39 PM   #4
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Cover the higher level of alcohol with more hops...
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Old 12-10-2012, 06:39 PM   #5
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I've pretty much thrown then attenuation rate listed on the packages/websites out the window. I control fermentables with mash temps/ingredients.

Once I converted to all-grain all my beers went under 1.010, hitting 1.008 when I mashed high 140's low 150s. If I want a little more body in my beer I will bump up to 154+
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Old 12-10-2012, 06:43 PM   #6
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S05 is a beast. It always finishes around 1.010 for me regardless of OG. Try mashing around 156F ag or using Nottingham dry yeast for a similar clean finish but bit less dry.
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Old 12-10-2012, 07:04 PM   #7
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If you want it to finish sweeter, increase your mash temp. But around 1.01 doesn't sound bad to me for a pale ale, if a little on the dry side.
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Old 12-10-2012, 07:05 PM   #8
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I mashed at 151, so based on the experiences here and my mash temp, seems I am right on. I did a Porter a few batches back and mashed at 156 to see what would happen. It left a lot more body. I just cracked one of those open after almost a year and I could swear it had been aged in an old sherry barrel. I guess that is a topic for another thread.
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Old 12-11-2012, 02:39 AM   #9
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I just bottled an IPA that I fermented with S-05. I gotta refigure all of my numbers with this stuff. I now have a 9.3%ABV IPA! It chewed a 1.080 wort down to 1.009, and that was just pouring it over the surface.

Does this stuff ever stop? How much alcohol will it tolerate?
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Old 12-11-2012, 09:00 AM   #10
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Ive got a barleywine in secondary at the moment, S-05 took it from 1.100 to 1.016! I figured on finishing more in the 1.025 range.

I think the tolerance is around 11.5-12%.


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