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Old 07-27-2012, 04:04 PM   #1
jrodskreet
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Jan 2012
lake, ms
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So I'm wanting to do a RIS but only 2 gallons. Of all the forums and recipes I've read almost all of them call for 2 packs of yeast for 5 gallons. So my question is, since I'm only doing a half batch ( or there about ), do I only need to use one pack of yeast? Or is there something I'm not aware of with high gravity and the amount of yeast?

 
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Old 07-27-2012, 04:22 PM   #2
pm5k00
 
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It depends on the OG but more than likely one packet will be fine. Check mrmalty.com to be sure.

 
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Old 07-27-2012, 04:28 PM   #3
fredthecat
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yes, as far as i know thats the case.

if someone is making say 10gallons of beer, they'd need twice as much of a yeast culture as 5 gallons. i thin for a high gravity beer however, you also want to make sure your yeast is healthy and kind of build it up towards tackling high gravity wort with a starter of some kind

 
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Old 07-27-2012, 04:30 PM   #4
trumpetbeard
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Rochester, New York
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What's your anticipated OG? Are planning on using a single pack of dry or liquid yeast?

If you're under 1.085 you could probably get away with a single pack of rehydrated dry yeast for a 2 gal batch. If you're using liquid yeast I would recommend doing a small starter. I do mostly 2.5 gallon batches and on some of my higher gravity belgiums I've done quart-2 quart starters (decanting before adding).

The general rule is that the higher the gravity the greater the number of healthy yeast cells are required for good fermentation. Mr. Malty is a good place to check pitching rates and to make sure you have adequate yeast.

 
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Old 07-27-2012, 04:32 PM   #5
teddy4xp
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I made a half batch (2.5 gallons) of a belgian specialty ale last weekend and according to mrmalty.com i still needed to pitch a full vial of white labs yeast.

 
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Old 07-27-2012, 08:29 PM   #6
jrodskreet
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Jan 2012
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thanks for all of the quick replies. I will check out mrmalty. My OG is expected from my calcs between 1.110 and 1.120

 
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