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Old 11-19-2010, 12:48 PM   #1
Bonde
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Default Diacetyl rest lenght

After reading a lot of posts regarding diacetyl rest I’m still in doubt regarding the length of the rest.

I’ve read 2-3 days when doing a lager, but will the beer suffer from fx 5-7 days? Just to be sure all diacetyl is gone.

And what about temperature, is the increase/rest proportional with fermentation temperature or will I be home safe with just resting at room temp 20-21c (68-70f)?

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Old 11-19-2010, 01:13 PM   #2
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No. My usual diacetyl rest length is about a week because it takes that long for me to get back around to it. It won't hurt anything as long as the vast majority of fermentation happens in the yeast's recommended temperature range.

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Old 11-19-2010, 09:38 PM   #3
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I usually do 5 days and have not had any problems. General rule of thumb is to raise it 10 degrees but I let it get to the mid to high 60's, again with no problems.

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Old 11-19-2010, 10:17 PM   #4
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You also don't need a D-rest unless there is diacetyl present. I wouldn't get all worked over a D-rest. Most of the time they aren't even necessary. If its your first lager then I would do one just 'cause, I guess (safety net approach). Anywhere from 2-7 days would be fine if you do it at the tail end of fermentation (air-lock activity has slowed down to one bubble every 10-20 secs). I would just put the fermenter at ambient temp. The warmer the temp, the less time will be needed for the D-rest.

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Old 11-20-2010, 07:42 AM   #5
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perfect :-) That cleared it all up for me.

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Old 11-20-2010, 11:08 AM   #6
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Thanks for the timely thread Bonde. I have been mulling over the same thing myself.

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