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Old 07-26-2010, 11:48 AM   #1
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Default Does anyone else only take a pre-boil gravity?

For probably my last 5 batches or so, I've only been taking a pre-boil gravity reading. As long as I'm not adding DME and hit my volume into the fermenter (which is the case 90% of the time) I don't see the point. I used to take both, but the numbers always came out, save MAYBE a point. Any thoughts on this? The way I see it, it's another few ounces of beer in my glass.



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Old 07-26-2010, 12:11 PM   #2
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Originally Posted by whatsleftofyou View Post
For probably my last 5 batches or so, I've only been taking a pre-boil gravity reading. As long as I'm not adding DME and hit my volume into the fermenter (which is the case 90% of the time) I don't see the point. I used to take both, but the numbers always came out, save MAYBE a point. Any thoughts on this? The way I see it, it's another few ounces of beer in my glass.
That's what I've been doing too most of the time, too. I mean, if I've hit my preboil gravity with 7 gallons, then I HAVE to hit my post-boil gravity with 5.25 gallons. The sugar is in there- it can't just go away.

Maybe it's just a Yooper thing?


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Old 07-26-2010, 12:44 PM   #3
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I only take a Post-boil gravity. If I miss my numbers so bad I have to add DME, ....well, that just doesn't happen anymore.

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Old 07-26-2010, 01:16 PM   #4
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I have been in the habit of taking the pre-boil gravity measurement lately, and I'll tell you why:

1) I make a lot of fine-tune adjustments to my system, and I vary the water/grist ratio of my mash, depending on the beer style. I also opt for mash out and switch back and forth between fly sparge and batch sparge, depending on the system setup that I'm using that brewday. It's good to get an idea of what my efficiency is.

2) If you know your pre-boil gravity, you can make adjustments to your hopping rate accordingly. One time I got 10% BETTER efficiency than I was planning, so I had to up my hopping charges to be sure that I'd hit my IBU's.

3) In the chaos of cleaning and chilling, I usually forget to take a post-boil reading. Like was said, if you at least have a pre-boil reading, the post-boil reading shouldn't be a surprise - the sugars don't evaporate!

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Old 07-26-2010, 01:23 PM   #5
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the sugars don't evaporate but the water does. i would think this would make it heavier because there is less water for the sugar to be in so wouldnt it be more concentrated and more heavy?

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Old 07-26-2010, 01:27 PM   #6
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I don't usually take any gravity readings any more, unless I am making an "unusual" beer for my setup.

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Old 07-26-2010, 02:16 PM   #7
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I take post-boil. If I hit what I wanted (which I do) then cool. If I don't hit what I want, well -- that hasn't happened yet.

I do take preboil and postboil for someone else brewing with my equipment. Just because there are so many variables (crush, grain, recipe formulation, etc) that they don't get the same efficiency that I do.

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Old 07-26-2010, 02:24 PM   #8
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I don't take pre-boil readings, either. But that's because, like Sly, I'm a rebel who lives on the edge . . . .


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Old 07-26-2010, 02:27 PM   #9
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I takes both.

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Old 07-26-2010, 02:34 PM   #10
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Almost always do a pre boil, the last brew I skipped it and of course I missed my FG numbers by a bit more than I like. First miss in a long time, it was not a good brew day.

Hopefully the end product will be good, first time back to liquid yeast in a long time.



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