Author Topic: Gravity for 1 pack dry yeast?  (Read 1154 times)

Offline yso191

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Gravity for 1 pack dry yeast?
« on: December 08, 2014, 10:39:45 PM »
I am on a kick experimenting with dry yeast.  Part of my experiment is to just dump the pack into the wort rather than pre-hydrating it.  I know I will lose some yeast cells doing it this way, but If I'm going to prep yeast I'll do a yeast starter.  To me the advantage of dry yeast is that it is quick (well, and cheaper).

My question is: at what gravity level does under pitching become a concern?  My next brew is an AIPA with an OG of 1.058.  Will one pack do, or should I add a portion of a second?  In case it matters the yeast in question is US-05.
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Offline HoosierBrew

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Re: Gravity for 1 pack dry yeast?
« Reply #1 on: December 08, 2014, 10:46:03 PM »
I've always pitched a second pack at 1.070+ and only recently started rehydrating. I've never had any ill effects,ie., always had good attenuation and yeast character.    Disclaimer - I prefer liquid cultures but I've used a ton of S05 for short notice brewing.

EDIT -  I think Denny said he'll go to 1.075 on one packet.
« Last Edit: December 08, 2014, 10:50:17 PM by HoosierBrew »
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Offline Wort-H.O.G.

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Re: Gravity for 1 pack dry yeast?
« Reply #2 on: December 08, 2014, 10:48:25 PM »
i just did an IPA 1.061 and rehydrated 1 pack of us-05. results: splendid IMO. everything as expected and tastes fantastic.
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Offline brewinhard

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Re: Gravity for 1 pack dry yeast?
« Reply #3 on: December 08, 2014, 11:20:34 PM »
I am along the lines with Hoosier.  If my wort is over 1.075 I will consider adding a bit more from a second pack, but I always have rehydrated with great results.  Under 1.075, 1 pack will suffice with no issues (providing proper aeration). 

Offline jimmykx250

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Re: Gravity for 1 pack dry yeast?
« Reply #4 on: December 09, 2014, 12:00:58 AM »
I do a house beer at 1.060 and one pack of us-05 does just fine. I have pitched dry quite a few time with no issues. Let us know how it works out for you.
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Re: Gravity for 1 pack dry yeast?
« Reply #5 on: December 09, 2014, 02:42:16 AM »
I wouldn't worry too much about under-pitching ales until the pitching rate gets below about 0.5 million/mL-°P (assuming you're targeting 0.75). If a pack of dry yeast contains ~200 billion viable cells, that would be around 1.080 OG for rehydrated yeast, or 1.040 for un-rehydrated. Ultimately, though, let your tastes decide.
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Offline erockrph

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Re: Gravity for 1 pack dry yeast?
« Reply #6 on: December 09, 2014, 06:38:50 PM »
For ales - up to 1.075 gets 1 pack of unrehydrated S-04 or US-05. For lagers I'd pitch two packets of 34/70 for anything up to a smallish doppelbock. If I only have 1 pack and I'm at the borderline of gravity for 1-pack, then I'd consider rehydrating as an insurance policy.
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Offline pete b

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Re: Gravity for 1 pack dry yeast?
« Reply #7 on: December 09, 2014, 06:45:01 PM »
I am on a kick experimenting with dry yeast.  Part of my experiment is to just dump the pack into the wort rather than pre-hydrating it.  I know I will lose some yeast cells doing it this way, but If I'm going to prep yeast I'll do a yeast starter.  To me the advantage of dry yeast is that it is quick (well, and cheaper).

My question is: at what gravity level does under pitching become a concern?  My next brew is an AIPA with an OG of 1.058.  Will one pack do, or should I add a portion of a second?  In case it matters the yeast in question is US-05.
To me rehydrating is so close to doing nothing that I do it just in case it helps.
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Offline Wort-H.O.G.

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Re: Gravity for 1 pack dry yeast?
« Reply #8 on: December 10, 2014, 01:48:55 PM »
Ken- Chagrin Falls, OH
CPT, U.S.Army
https://www.facebook.com/pages/Harveys-Brewhaus/405092862905115

http://braukaiser.com/wiki/index.php?title=The_Science_of_Mashing

Serving:        In Process:
Vienna IPA          O'Fest
Dort
Mead                 
Cider                         
Ger'merican Blonde
Amber Ale
Next:
Ger Pils
O'Fest

Offline woodlandbrew

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Re: Gravity for 1 pack dry yeast?
« Reply #9 on: December 10, 2014, 07:33:15 PM »
Here is another experiment you may be interested in: http://www.woodlandbrew.com/2013/02/rehydrating-safbrew-yeast.html
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