RIS stuck fermentation help

Discussion in 'Homebrewing' started by beerbully, Mar 14, 2015.

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  1. beerbully

    beerbully Savant (1,169) Feb 2, 2009 New Jersey

    Brewed Northern Brewer Extract Imperial Stout kit that's been in the primary for 5 weeks. Fermented at 60 degrees ambient for 3 weeks and then 68 ambient for last two weeks. OG was 1.088 after 3 weeks gravity was 1.035. Moved it to warmer place and after 2 more weeks in primary gravity was about the same. According to on-line gravity calculators the FG should be 1.025.

    Wondering what the next step should be.............pitch more yeast, if so, the same strain or just some dry (clean / neutral) yeast to help it finish..........keep waiting........or move to secondary and let it sit for a month or so before bottling. Thanks in advance.

    Recipe as follows:

    Steeping grains
    .5 lb Roasted Barley
    .5 lb English Black Malt
    .5 lb English Choc Malt

    LME
    12 lbs Dark Malt syrup ( 6 lbs @60 min and 6lb at 15 min)

    Hops
    1.75 Summit @ 60
    2 Cascade @ 0

    Yeast
    WLP 028 Edinburgh pitched to a 1 liter starter
     
  2. VikeMan

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

    1.025 would be almost 72% apparent attenuation. That's pretty ambitious given the recipe. Most calculators suck at predicting attenuation, because they don't take fermentability of the specific wort into consideration.

    It might be done. When you say gravity was "about the same," had it moved at all?
     
  3. beerbully

    beerbully Savant (1,169) Feb 2, 2009 New Jersey

    maybe .002
     
  4. VikeMan

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

    If so, it wasn't stuck and wasn't finished. I'd wait 3 days and check again.
     
  5. beerbully

    beerbully Savant (1,169) Feb 2, 2009 New Jersey

     
  6. VikeMan

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

    1.030 maybe. But 1.033 may well be done.
     
  7. beerbully

    beerbully Savant (1,169) Feb 2, 2009 New Jersey




    Thanks
     
  8. PapaGoose03

    PapaGoose03 Grand High Pooh-Bah (6,057) May 30, 2005 Michigan
    BA4LYFE Society Pooh-Bah

    If you brewed a 5-gallon recipe for which your gravity readings are calculated, can you validate that you have 5 gallons of liquid in that fermentor? Less liquid than planned will give you a higher gravity reading.
     
  9. beerbully

    beerbully Savant (1,169) Feb 2, 2009 New Jersey



    Yep...... 5 gallons
     
  10. Daemose

    Daemose Maven (1,407) Oct 3, 2011 Texas

    Bottle it.
     
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