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Old 11-13-2012, 06:52 PM   #1
Oct 2012
Thousand Oaks, CA
Posts: 12

I brewed a partial mash imperial stout on Sunday. My target OG was 1.090 but because I tried to use too much grain compared to the water capacity of my brew kettle (BIAB method), I ended up only hitting 1.070 (had to add water back into the boil in order to hit post boil 2.5 gallons). Lesson learned for future brews about water to grain ratio and it's impact upon efficiency.

The problem is that before I took my OG reading, I had already rehydrated my 1.5 packs of S-05 yeast, per MrMalty's pitching recommendations on five gallons of 1.090 OG beer. So I ended up pitching 1.5 packs of yeast. But based on the 1.070 actual OG, I should have only pitched 1.2 packs.

My question then is whether I overpitched so much that I can expect strong off flavors to result (fortunately, a black as night stout should in theory mitigate some of that) or if my rate of overpitching was light enough where the beer won't end up tasting like a mess.
Primary: Winterfell Black Stout
Secondary: None
Bottled: It's the Most Wonderful Time for a Beer Xmas Ale, Rumplepumpkin Imperial Pumpkin Porter, Walder Frey's Treacherous Smoked Mild.

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Old 11-13-2012, 07:28 PM   #2
45_70sharps's Avatar
Sep 2012
Raymond, Washington
Posts: 1,807
Liked 172 Times on 141 Posts

I wouldn't worry at all.
You aren't way high and I don't think over pitching is as detrimental to flavor as under pitching.

I might see what the book says about it tonight.
Let's see if I keep this updated!

On tap
Black Butte clone

In secondary
Pumpkin ale

In primary
Honey wit

Up next.. Firestone Union Jack clone

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Old 11-13-2012, 07:31 PM   #3
Aug 2012
Posts: 307
Liked 45 Times on 37 Posts

Pretty sure you'll be just fine. I regularly use a whole packet of US-05 for a 2.5 gallon batch of average (1.050 or so) gravity with no adverse effects.

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Old 11-13-2012, 07:45 PM   #4
Jul 2010
Portland, OR
Posts: 1,654
Liked 185 Times on 171 Posts

You have to significantly over pitch (on the order of 4-6x recommended) to have a large enough effect to taste on a homebrew scale. Greatest effect will be a smaller growth phase which might decrease growth related flavors, but with US-05 you aren't looking for those anyway. Belgians and Hefeweizens are more likely to suffer from overpitching decreased flavors than a stout.
You might consider sparging your grain bag in another pot to extract more sugars next time, there were probably a ton of gravity points left in the grain bag after a low water to grist ratio mash like that. You can always boil off excess volume and concentrate the wort if you end up with a lower than desired gravity wort that is a larger volume than needed.

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