Questions tagged [attenuation]

The percentage of sugars present in the wort converted to alcohol by yeast. Typical attenuations are 60-80%.

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Batch size affecting my Final Gravity?

So i recently fermented a pale ale but only was able to transfer just under 4 gallons of my planned 5.5 gallons into my fermenter due to transfer issues. My final gravity is shooting past my 1.018 ...
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Low attenuation beer good enough for bottling

I recently brewed a new 5 gallon batch of hefeweizen. Measured OG was 1.054, I then racked to secondary fermentation after a couple of weeks, the last week of that had had no visible yeast activity. ...
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Sucrose fermentation using S/Cerevisiae vs. S/Bayanus

tl;dr version: why does S/Bayanus ferment sucrose to an apparent attenuation of more than 95% while S/Cerevisiae ferments it to an apparent attenuation of about 65-70%? Details: I've been ...
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2 votes
1 answer
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Really fast attenuation with starter. Is this to be expected

A little bit of background: I finished brewing a black IPA and pitched yeast around 5:00 on Sunday. Admittedly, the wort was a little warm (75F), because it was 9 degrees outside and I was in a ...
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Beer attenuates too much too fast

I am brewing with fermentis S-04 and from experience (three years ago) I know that this yeast is slow. This weekend I brewed a small batch and today the attenuation is 83% (according to the yeast's ...
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Yeast Attenuation

Does the percentage attenuation of the yeast, directly match the fermentability of the wort, ie, If i am after a one fifth gravity beer, then that has attenuated by 80% . so is the spirit indication ...
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What is the control recipe for official yeast attenuation ratings?

Attenuation is the % of sugars a yeast will consume during fermentation, and is a general gauge of how much ABV will result from a specific OG solution. We all know that the attenuation of a specific ...
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3 votes
2 answers
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Process and timing to detect a stalled fermenation in order to add more yeast (repitch)

Working with a 1.060 original gravity wort, mashed at 152F, and using the WLP565 Dupont yeast (that is known to stall), when should the brewer investigate if adding a secondary strain of yeast will be ...
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Beersmith Safale T-58 attenuation

I've just measured the final gravity of a Belgian beer I've been brewing and it came out 4 points below the expected according to Beersmith: 1.022 rather than 1.018. It was 14 days in the fermenter. I ...
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Yeast Attenuation: Mangrove Jack's M79 Burton Union

What attenuation percentages have people actually seen with this yeast? The back of the package specifies the attenuation as "HIGH", but my own experience suggest that it is medium or low.
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How to get a feel for the numbers involved in brewing

So I drink a lot of beer (go figure) and I try to characterize it each time. How much carbonation there is, what color it is, mouth feel, what specific flavors are involved, how hoppy it is, how malty ...
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How does the attenuation limit from mash temperature affect yeast attenuation?

Like, for example, if you select a yeast with an average attenuation of 80%, but you mash at 160, which limits attenuation to 76.8%1, would the limit simply be the lower of the limit or the average ...
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Why does WLP002 sometimes attenuate more?

So I am brewing lots of bitters using WLP002. Typically, I mash a grist with around 10-15% specialty malts at 66 C and ferment at 20 C. (I use BIAB and dunk sparging.) The typical situation is that ...
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6 answers
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High FG / Low Attenuation across 3 different beers

I have brewed 3 all-grain batches now that have a high final gravity: Imperial IPA: Target OG - 1.079, Target FG - 1.011, Actual OG - 1.070, Actual FG - 1.020, Yeast - US-05. Common attenuation ...
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7 votes
4 answers
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Safely adding enzymes (e.g. Beano) to lower final gravity

I've heard a lot of mixed stories about people adding additional enzymes (Beano, GasX, etc) to their beers to drop the final gravity down very (sometimes undesirably) low. I've also hear mixed ideas ...
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Bottle conditioning

More reading - this time about bottle conditioning. If my yeast attenuation level is say 80%, does that mean there would be enough sugars in the bottle for the yeast to carb the beer? Or would priming ...
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Yeast attenuation and fermentable sugars

I'm a little confused about this and can't find an answer that satisfies my curiosity... I've found a helpful thread (What does high attentuation actually mean in terms of types of sugar fermented?) ...
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What is the normal attenuation for sour wort (specifically Berliner Weisse)?

I brewed a kettle-soured Berliner Weisse with an OG of 1.034. After two weeks fermenting at around 70 (raised to 72 at the end) with a packet of Safale US-05, it got down to 1.014, apparent ...
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Why is my attenuation so low?

Here's the recipe: > Recipe Specifications > -------------------------- > Boil Size: 7.37 gal Post Boil Volume: 6.38 gal Batch Size (fermenter): 5.50 gal Bottling Volume: 5.50 gal > ...
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1 answer
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Troubleshooting a stuck fermentation with Ringwood Ale

I'm brewing an IPA using Wyeast 1187 (Ringwood Ale) and it seems stuck. I'm brewing 19L (5G) with an OG of 1.052 and pitched two (smacked) smackpacks of 1187 straight into the primary bucket. I used ...
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9 votes
5 answers
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Over attenuated all grain beers

I'm having a problem with all my beers regardless of style getting over attenuated. I've been raising my mash temps up to 4° above each beers style (up to 158° or so) to compensate with no luck. I've ...
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6 votes
4 answers
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How to lower Final Gravity?

I made a Thomas Coopers Stout with 1.1kg of dark malt extract and 400g of maltodextrin and used the yeast that came with it. I got a Starting Gravity of 1.046 and Final Gravity of 1.024. Are there ...
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7 answers
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Does suspended yeast contribute to high SG?

I've got a SMaSH beer (Baird Maris Otter and EKG) finishing in primary. It's been fermenting for just over a week. Starting Gravity was 1.046. I mashed at 154F for 60 minutes. Fermented with WY1335 ...
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Does dry hopping affect attenuation?

Does the anti-microbial affects of hops affect yeast activity and therefore attenuation when dry hopping near the end of primary fermentation?
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Can I add more yeast during primary fermentation?

I've got a brew that's been on primary fermentation for 10 days and still haven't seen any activity in the airlock (again). Gravity has dropped from 1.040 to 1.014, but I'd still like to raise the ...
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4 votes
2 answers
2k views

Does Champagne yeast really dry out a beer?

If you pitch champagne yeast into your wort from the start will it attenuate further than done with an appropriate pitch of standard american ale yeast (say WLP001)? I think people use champagne ...
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12 votes
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What factors can lead to a higher attenuation?

I recently brewed a Malt Extract beer with WLP060. The "Attenuation" range on the White Labs site says it should be in the range of 72-80%. I had an OG of 1.0575, and an FG of 1.0096. By my ...
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4 votes
2 answers
620 views

Looking for a relatively low attenuating yeast with distinct Belgian flavors.

I'm working on a recipe for a Baltic porter but would like to ferment it with a stran that produces distinct belgian flavors. The problem is that most of your belgian strains are too high attenuating. ...
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4 votes
1 answer
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What gravity is suitable for not using priming sugar?

Assuming full attenuation, is there a way to figure out what gravity reading would be suitable to not use priming sugar, and just allow the excess sugar to create the carbonation? A sub-question would ...
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7 votes
3 answers
8k views

How do I predict final gravity?

I've been taking the original gravity and multiplying the apparent attenuation of the yeast. For instance: 1.040 OG x 75% apparent attenuation = 1.010 expected FG But I never seem to get there. My ...
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