Time for a diacetyl rest? - Home Brew Forums
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Old 01-17-2012, 03:51 AM   #1
lmahony1
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Jan 2012
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Brewing my first lager. A Vienna using Wyeast 2206. Starting gravity at 1.064 fermenting 9 days at 49F, just took a reading at 1.024. I am hoping for final gravity of 1.015-1.016. Is this a good time to start the rest? Thanks in advance for any help.



 
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Old 01-17-2012, 06:39 PM   #2
JJL
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I would recommend doing it soon. The typical recommendation is to do a D-rest when fermentation is about 75% complete.



 
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Old 01-17-2012, 07:01 PM   #3
stratslinger
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+1 - sounds like now's the time, if a d-rest is necessary.

Did you taste the sample? Could you detect diacetyl? In a Bock I brewed recently, with pretty similar numbers, I tried a sample while the SG was in the mid 20's, and got a mouthfull of butter with a wierd, almost oily mouthfeel. Gave it a couple days d-rest right then and there, and the end result was a nice, diacetly-free bock.

That said, if you tasted the sample and didn't detect any diacetyl, you may not even need a d-rest.

 
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Old 01-17-2012, 07:05 PM   #4
lmahony1
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Quote:
Originally Posted by stratslinger View Post
+1 - sounds like now's the time, if a d-rest is necessary.

Did you taste the sample? Could you detect diacetyl? In a Bock I brewed recently, with pretty similar numbers, I tried a sample while the SG was in the mid 20's, and got a mouthfull of butter with a wierd, almost oily mouthfeel. Gave it a couple days d-rest right then and there, and the end result was a nice, diacetly-free bock.

That said, if you tasted the sample and didn't detect any diacetyl, you may not even need a d-rest.
I can taste it. I pitched plenty of yeast but pitched at a little higher temp than I wanted to.

 
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Old 01-17-2012, 07:12 PM   #5

Yes now is the time.
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Old 01-17-2012, 07:13 PM   #6
losman26
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Jan 2012
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I'm going through the same process with my first lager at about 6 days fermenting. How much airlock activity do you have? Mine is a lower gravity one 1.040 OG and target FG is 1.010. I used one pack Wyeast Bohemian yeast which took 2 days to get started, so in reality, I've only seen activity since last Friday. Is it usually time to do a D-rest when the Krausen totally falls? Or is it usually before? I'm still getting about 20 bubbles per min. When would you guess it would be ready to do a D-rest? Thanks

 
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Old 01-17-2012, 07:19 PM   #7
lmahony1
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I took another reading. Lost another .002. I will go ahead and start the rest... it tastes like Land O' Lakes brewed it right now (I am pretty sensitive to diacetyl though). Thanks for the responses.

 
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Old 01-17-2012, 07:24 PM   #8
lmahony1
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Losman26.. I am getting a bubbles every 8 seconds and my Krausen is about 25% of what it was at peak. I used one pack in a 650 ml starter (1/2 cup DME) but pitched about 10 degrees higher than my fermentation temp. I later pitched a second pack when the wort had fallen to 48 degrees .. paranoia or useful??? It took about 18 hours for air lock activity to start.

 
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Old 01-17-2012, 09:42 PM   #9
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losman26 - don't try to judge anything based on bubbles or krausen. Some krausens don't drop, others never form (at least, not significantly), and bubbling is inexact at absolute best (completely inconclusive at worst).

Take a gravity reading. If you're expecting a total 30 point drop in gravity, then once you've dropped 22.5 points or so it's about time for a d-rest. So, once you hit right around a 1.018 or 1.017 gravity, it's time.

 
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Old 01-18-2012, 12:43 AM   #10
losman26
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just out of curiosity, if you had to put a guess on home may days you waited to to the D-rest, what would it be?



 
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