Happy HolidaySs Giveaway - Last Sponsor Giveaway of the Year!

Come Enter the BrewDeals/FastFerment Giveaway!


Home Brew Forums > Home Brewing Beer > General Techniques > Lager Diacetyl rest
Reply
 
LinkBack Thread Tools
Old 11-30-2012, 03:16 AM   #1
greyfox_21
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2010
Location: Myerstown, PA
Posts: 5
Default Lager Diacetyl rest

When is the optimal time to do a diacetyl rest for a lager. I have done an extract recipe where I did not do a rest at all and did not have any off flavor of diacetyl and done an all grain where I have done a diacetyl rest for the last 2 days of primary fermentation and have had substantial diacetyl flavor. Thoughts? Maybe I have done something else wrong during the process to have left over diacetyl in my beer.

__________________
greyfox_21 is offline
 
Reply With Quote Quick reply to this message
Old 11-30-2012, 03:36 PM   #2
501irishred
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
501irishred's Avatar
Recipes 
 
Join Date: Oct 2012
Location: Benton, Arkansas
Posts: 1,236
Liked 122 Times on 98 Posts
Likes Given: 29

Default

"By the book" you followed a good process for your ag batch. Depending on the yeast strain used, a rest may not be "required", and some may need an extra day or two. What temp did you use for your rest, and how did you lager afterwards?

__________________
501irishred is offline
 
Reply With Quote Quick reply to this message
Old 11-30-2012, 04:10 PM   #3
TopherM
Vinz Clortho - the Keymaster of Gozer the Gozerian
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
TopherM's Avatar
Brew Setups
Recipes 
 
Join Date: Mar 2011
Location: St. Petersburg, FL
Posts: 3,897
Liked 428 Times on 338 Posts
Likes Given: 22

Default

Ideally, you are supposed to do the D-rest when you have reached 75% of FG. For example, if your OG is 1.05 and your expect FG is 1.01, then 1.05-1.01=1.04; 75% of 4 gravity points = 3; 1.05 - 1.03 = 1.02; So you would do the D-rest at 1.02. 48 hours at 70ish, IDEALLY ramping up from your fermentation temp to 70ish at about 5 degrees/hour, then following the D-Rest, ramping down to lagering temps at about 5 degrees/hour.

When I do lagers, I generally follow those rules, but I'm pretty lax about getting everything perfect, and my lagers turn out great, but ideally, that's what the procedure would be. As a benchmark, 75% FG is generally right about when you start to notice the fermentation slowing down as far as airlock activity.

__________________

Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Mango Habenero Berliner Weisse
Primary #3 - EMPTY!
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Oktoberfest
Keg #2 - Chamomile Honey Wheat
Keg #3 - Pumpkin Ale
Bottled - NONE!

TopherM is offline
 
Reply With Quote Quick reply to this message
Old 11-30-2012, 06:09 PM   #4
greyfox_21
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2010
Location: Myerstown, PA
Posts: 5
Default

Quote:
Originally Posted by 501irishred View Post
"By the book" you followed a good process for your ag batch. Depending on the yeast strain used, a rest may not be "required", and some may need an extra day or two. What temp did you use for your rest, and how did you lager afterwards?
I used WL Octoberfest yeast and the rest was done at 68F. I know the rest should be at a higher temp but my basement does not get that warm in the summer time and I do not have the equipment to raise the temp. I lagered at 45F for 4 weeks and kegged at 42F for 3 weeks.
__________________
greyfox_21 is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
First Lager...Diacetyl rest? jpm5171988 Fermentation & Yeast 4 08-14-2012 04:49 PM
Diacetyl rest for my first Lager DanPoch Fermentation & Yeast 15 01-02-2012 04:36 PM
Lager Diacetyl Rest MikeDelta1 Fermentation & Yeast 12 07-22-2011 08:33 PM
Lager Diacetyl Rest Jennings Fermentation & Yeast 4 03-09-2011 03:56 AM
How to tell if your lager needs a diacetyl rest nostalgia General Techniques 52 04-23-2009 04:12 PM



Newest Threads

LATEST SPONSOR DEALS