Fermentation after krauzen subsides?

Discussion in 'Homebrewing' started by tjumfrid, Jun 20, 2014.

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  1. tjumfrid

    tjumfrid Initiate (0) Jun 15, 2013 Arizona

    Ok, so I've been sitting on my first brew (pale ale) for a week. I got all the ingredients in a kit that came with all my equipment. Throughout this whole time, I never got any action from the airlock (using a bucket) even though I made sure the lid was on tight. Last Sunday, after being quite curious as to whether the yeast was doing anything or not, I popped the lid and took look. Nice fat krauzen in there. Well, just checked again today and the krauzen is gone. I took a hydrometer reading and it said 1.015 (after accounting for temp change) and the end recipe calls for a reading of 1.010-1.012. Has my yeast given up? If there were still yeast at work, would the krauzen still be there?

    At any rate, I will check the hydrometer again in a few days to see any change. What do you if the yeast has in fact given up? anything? More sugar?

    Thanks for helping an aspiring brewer out
     
  2. ThomP

    ThomP Initiate (0) Nov 22, 2007 Texas

    I will generally give about 2 weeks total so the yeast have time to do their thing. Although if in a couple of days the hydrometer reading is the same, you can bottle it without worry.
     
  3. CDennyRun

    CDennyRun Initiate (0) Mar 2, 2014 Washington

    There could be a few factors involved, IE fermentation temp (did it fluctuate, was it correct?) were the instructions followed to the T, like boil times, reach the correct boil etc. It could very well drop a few more digits. Like ThomP said, give it a few more days and see where it's at.

    Enjoy your first brew bud!

    Cheers!

    Chris
     
  4. OddNotion

    OddNotion Pooh-Bah (1,915) Nov 1, 2009 New Jersey
    Pooh-Bah

    What yeast did you use? What was the recipe? Did you monitor fermentation temps, and if so what were they?
     
  5. tjumfrid

    tjumfrid Initiate (0) Jun 15, 2013 Arizona

    I used a SafAle yeast US-05, and the recipe was for a pale ale. The fermentation temps fluctuated slightly at the beginning (maybe 4 degrees within the first few hours) but then remained constant at about 70 degrees.

    Another question- when using hydrometer and tweaking the reading for the change in temperature, do you tweak both OG and FG readings, look at the corresponding 'potential ABV's on the hydrometer, and then subtract both the OG and FG readings?
     
  6. PortLargo

    PortLargo Pooh-Bah (1,831) Oct 19, 2012 Florida
    Pooh-Bah

    Your yeast haven't given up . . . what you are seeing is how they do their job. They are at the end of the growth phase and starting the conditioning phase. It's possible you might drop another couple of points (or not). But it's vital to allow those little buggers to finish their job. Here's a quick read on the subject. It is important to not get in a hurry, you would rather error in leaving your beer on the yeast a few days longer than necessary rather than rack too soon. I consider two weeks the minimum time for primary fermentation, it's not unusual to allow a third week. Temp control is less critical now but don't let it go wild.

    With your hydrometer you want to always apply a temp correction to your readings. But your OG (adjusted for temp) is set in stone after you take the reading. I suggest you ignore the potential ABV reading and use an ABV calculator (search Google) or just multiple the OG/FG difference by 131.25. In your case, I recommend giving it another 3-4 days before taking another reading. You will know you've reached FG after successive reading of the same gravity (typically taken 3 days apart). Even if you are at FG now you want to let the yeast complete the conditioning phase.
     
  7. tjumfrid

    tjumfrid Initiate (0) Jun 15, 2013 Arizona

    Wow, using an ABV calculator is a huge help. Thanks for the help PortLargo. The calculator says the ale is about 4.5%, so it's getting there. Thanks!
     
  8. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    Probably not. Though depending on your recipe and process, attenuation may (or may not) be finished. But for a pale ale kit (presumably extract), with a typical american yeast strain, I'd say you're probably not quite at FG yet.

    Not necessarily.
     
  9. ronobvious2

    ronobvious2 Initiate (0) Aug 24, 2010 Tennessee

    I'm still a newb at all of this, presently brewing my 3rd batch, but I need to ask: If your FG is supposed to be 1.010 - 1.012 is 1.015 really off the mark?
     
  10. VikeMan

    VikeMan Grand Pooh-Bah (3,067) Jul 12, 2009 Pennsylvania
    Pooh-Bah

    It depends on where the 1.010-1.012 estimate came from, i.e. based on what assumptions or calculations? But if I had a good solid 1.012 estimate, and the beer came in at 1.015 (and stayed there), I wouldn't worry *too* much. If I had a good solid 1.010 estimate and the beer came in at 1.015, that would raise a red flag.
     
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