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Old 06-05-2012, 06:12 PM   #1
Dec 2011
St. Louis Area, MO
Posts: 340
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I have read several threads about double milling the grains for better efficiency with BIAB. The guy at my LHBS said that is not necessary. Does a single crush work just fine or based on everyone's experience here is double milling the way to go?

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Old 06-05-2012, 06:15 PM   #2
tre9er's Avatar
Jan 2012
Lincoln, NE
Posts: 4,371
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depends on the crush. If there are any uncracked grains or just barely cracked at all...that could hurt. With BIAB a lot of flour is fine, so a finer crush may yield you greater returns. I've been noticing my efficiency does seem to be tied to the crush.
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Old 06-05-2012, 07:16 PM   #3
jcdouglas's Avatar
Jul 2011
Madison, WI
Posts: 133
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Most LHBS set their mill so that 3 vessel brewers avoid a stuck sparge. With BIAB, you don't need to worry about this. Based on my experience, most of the time a double crush improves efficiency. Brew one batch with a single crush and another batch with a double crush and test it yourself.

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Old 06-05-2012, 07:26 PM   #4
Apr 2009
Highlands Ranch, CO
Posts: 1,326
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as said, yes it can effect it. I'd tell him to double crush anyway, it won't hurt and could help

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Old 06-05-2012, 10:49 PM   #5
Eternal Tinkerer
Mar 2012
Sidney, Ohio
Posts: 407
Liked 77 Times on 59 Posts

I started double crushing mine, and have noticed an increase in efficiency.
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Old 06-06-2012, 04:25 AM   #6
Dec 2010
st charles, il
Posts: 157
Liked 9 Times on 6 Posts

I crush my own, and do a much finer crush than either buying pre-crushed, or having the LHBS crush for me. Definitely better efficiency.
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Old 06-06-2012, 05:39 AM   #7
Sep 2011
Posts: 1,189
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Yap, do it twice. It will help. He may not think it's necessary, but you're paying his bills, man. For an extra ~45 seconds of effort, he should be willing to accomodate you. He can advise all he wants, but in the end, it's your beer.

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Old 06-06-2012, 12:47 PM   #8
Feb 2012
Posts: 3

If you're BIAB, Increase your mash to 90 minutes and you'll greatly increase your efficiency.

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Old 06-06-2012, 02:23 PM   #9
sivdrinks's Avatar
Apr 2011
Lebanon, PA, PA
Posts: 809
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I get around 85% efficiency with a double crush as opposed to 69-75% standard crush.

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Old 06-06-2012, 04:25 PM   #10
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Apr 2011
Minneapolis, Minnesota
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I get 75-80% eff from BIAB. Before I had a grain mill, I'd double (or triple) crush at the HBS and got 70-75%. I have my mill set to ~.42 or so, and since I started milling my own grain, I've seen that 5-10% jump in eff. So yeah, for BIAB, the better the crush, the better your eff.
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