Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > General Beer Discussion > When and if to do a Diacetyl rest?
Reply
 
LinkBack Thread Tools
Old 02-01-2012, 02:32 AM   #1
zacster
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2008
Location: Brooklyn, NY
Posts: 1,030
Liked 22 Times on 21 Posts

Default When and if to do a Diacetyl rest?

My lager is happily fermenting at 54 at the moment, 2 days in. The last lager I made I didn't do a diacetyl rest and it came out great, but for some reason I'm thinking I'll do one this time. At what precise point should I do it? I'm reading at 80% or thereabouts, but when will that be? My OG was 1.052, so would that be at around 1.020? I don't usually take readings until I'm sure it is complete.

I'm crossing my fingers on the weather too. It was in the high 50s today, and tomorrow it is supposed to be even warmer. This is some winter we're having here in NYC. I rely on the cold weather for my temps. Last year was cold and I had to worry more about keeping it from freezing. If it goes above 60 my beer will go above 60 with it, or maybe a little less. I have it in a shallow cold water bath right now in the cooler evening, I'll put ice bottles in it in the morning.

__________________
zacster is offline
 
Reply With Quote Quick reply to this message
Old 02-01-2012, 02:50 AM   #2
Bernie Brewer
Grouchy Old Fart
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
Bernie Brewer's Avatar
Recipes 
 
Join Date: Feb 2006
Location: Eldorado, WI
Posts: 7,539
Liked 121 Times on 52 Posts
Likes Given: 2

Default

What is your expected FG? If you are expecting 1.012 then 1.020 would be 80%. I would think you might start it a bit higher. and you should taste your sample- if you can't taste the diacetyl then you don't need to do the rest, but it certainly won't hurt anything if you do one.

__________________
I like to squeeze the nickle until the buffalo craps-mt rob

"Why don't we get drunk and screw?" Jimmy Buffett
Bernie Brewer is offline
 
Reply With Quote Quick reply to this message
Old 02-01-2012, 05:13 AM   #3
thrstyunderwater
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2009
Location: Logan, UT
Posts: 423
Liked 2 Times on 2 Posts

Default

What's a diacetyl rest?

__________________
thrstyunderwater is offline
 
Reply With Quote Quick reply to this message
Old 02-01-2012, 05:17 AM   #4
prrriiide
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Smokin cigarettes and watching Captain Kangaroo
Posts: 610
Liked 16 Times on 14 Posts
Likes Given: 8

Default

Quote:
Originally Posted by thrstyunderwater View Post
What's a diacetyl rest?
Quote:
Beer sometimes undergoes a diacetyl rest, in which its temperature is raised slightly for two or three days after fermentation is complete, to allow the yeast to absorb the diacetyl it produced earlier in the fermentation cycle.
Wiki
__________________
It seemed like a good idea at the time...
prrriiide is offline
 
Reply With Quote Quick reply to this message
Old 02-01-2012, 11:00 PM   #5
Bernie Brewer
Grouchy Old Fart
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
Bernie Brewer's Avatar
Recipes 
 
Join Date: Feb 2006
Location: Eldorado, WI
Posts: 7,539
Liked 121 Times on 52 Posts
Likes Given: 2

Default

Quote:
Originally Posted by thrstyunderwater View Post
What's a diacetyl rest?
Quote:
Originally Posted by prrriiide View Post
Usually it only something to worry about when lagering.
__________________
I like to squeeze the nickle until the buffalo craps-mt rob

"Why don't we get drunk and screw?" Jimmy Buffett
Bernie Brewer is offline
 
Reply With Quote Quick reply to this message
Old 02-02-2012, 12:58 AM   #6
AAIndigo
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2012
Location: Franklin, Ma
Posts: 76
Default

I am in week 2 of a lager in my secondary with the temperature at 35 degrees. I was going to let it sit for 2 more weeks at this temp. Should I bring it up to 50 at the end of my ferment for a few days before bottling?

__________________
AAIndigo is offline
 
Reply With Quote Quick reply to this message
Old 02-02-2012, 03:34 PM   #7
pjj2ba
Look under the recliner
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
pjj2ba's Avatar
Recipes 
 
Join Date: Jul 2006
Location: State College, Pennsylvania
Posts: 3,427
Liked 195 Times on 161 Posts
Likes Given: 22

Default

If you chilled to 54F or below before pitching, you probably won't need a diacetyl rest. The rest is recommended when the wort is pitched warmer and then cooled to fermentation temperatures once signs of fermentation are visible.

I brew lots of lagers and have never done a diacetyl rest and have never had a problem.

__________________
On Tap: Ger. Pils, OKZ (std Amer. lager), CZ Pils, Maibock,
Kegged and Aging/Lagering:CAP, CAP II, Wheat lager, Imperial Pilsner, Ger. Pils, OKZ (std Amer. lager), OKZ II (for base malt comparison), light beer - yes, light beer, Belgian IPA, IPA,
Secondary:
Primary: Pale Ale
Brewing soon: Saison
Recently kicked : ( IPA, Bock, Saison,
Pilsner Urquell Master Homebrewer
(1st NYC 2011, 2nd NYC 2012)
P U crowns winners in its inaugural master HB competition
pjj2ba is offline
ChaosStout Likes This 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
diacetyl rest too early? mleary General Beer Discussion 1 01-18-2011 10:18 PM
Diacetyl Rest Questions osagedr General Beer Discussion 3 01-23-2010 06:17 AM
Diacetyl Rest: Misnomer? SavageSteve General Beer Discussion 17 06-06-2009 05:22 AM
Make sure you don't skip that diacetyl rest!!!!! Dude General Beer Discussion 27 11-08-2006 01:43 AM



Newest Threads

LATEST SPONSOR DEALS