Low Attenuation mean high carbonation? - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Low Attenuation mean high carbonation?
Cool Brewing Corny 5G & Mini Giveaway
Sign-up To NEW HBT Article Newsletter - Brewing Articles Direct To You!

Thread Tools
Old 03-04-2012, 04:21 AM   #1
Join Date: Mar 2011
Location: Colorado Springs, CO
Posts: 73
Liked 1 Times on 1 Posts

Default Low Attenuation mean high carbonation?

With this hobby, seems like you are always experiencing something new. Well after over a dozen batches, I ran into low attenuation and have one question please. I really appreciate your help to know what I may have done.

Information: Stout made with 1 lb of unmalted black roasted. Otherwise, just a bunch of LME to make a 5 gallon batch.

SG was 1.067, FG is 1.021. Left it 21 days in the primary hoping I would get it down further. Used Wyeast 1084 irish ale yeast. Did have a start this time, but usually I do not. It went from the 1.067 to 1.021 within 7 days. Nothing happed for the next 2 weeks. Comes out to be around 68% attenuation. I bottled them and put them in the closet at 69 degrees F.

Question: Will the priming sugar wake the yeast up and try to attenuate the beers priming sugar, PLUS the beers remaining sugars from the low attenuation? Thus causing some over carbonated beers? I used 4 oz by weight priming sugar for 4.5 gallons of bottling.

KilhavenBrew is offline
Reply With Quote
Old 03-04-2012, 07:09 AM   #2
Join Date: Nov 2010
Location: ohmihachiman, Japan
Posts: 804
Liked 87 Times on 64 Posts
Likes Given: 85


You're only a few percentage points off (71-75%). You may see a little extra carbonation from remaining sugar in the beer, but I doubt you'll end up with anything terribly out of line.
"Beer, well respected and rightly consumed, can be a gift of God. It is one of his mysteries, which it was his delight to conceal and the glory of kings to search out."

The Search for God and Guinness by Stephen Mansfield
tektonjp is offline
Reply With Quote

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
High Attenuation with US-05 carp Fermentation & Yeast 26 05-02-2014 05:25 AM
Attenuation too high? Hitokiri Fermentation & Yeast 13 08-30-2011 05:33 PM
Very high attenuation with WLP002 bolts Fermentation & Yeast 16 06-07-2011 12:36 PM
Need Advice - High Attenuation & Low FG 1.002 Vintage63 Fermentation & Yeast 9 02-14-2011 12:40 AM
S-04 and Way too high attenuation RichBenn Fermentation & Yeast 22 11-04-2010 02:53 AM

Forum Jump