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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > All grain and high attenuation
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Old 10-06-2012, 03:33 PM   #1
phuff7129
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Default All grain and high attenuation

I just finished my 9th all grain 5 gallon batch, and again I had a lower than expected FG. Everyone of my all grain brews has attenuation far beyond expected FG. The brews have been good, but I am not sure if I am doing something wrong or right.

My first thought was my thermometer was off and I was mashing at much lower temps than I thought but I have used two different thermometers and got the same readings. I also calibrated both thermometers at freezing and boiling and they are on the money.

Here are the brews, yeast, mash temps, OG and FG's for my batches. If I list a liquid yeast I did a starter based on mrmalty.com specs. Take a look and let me know what you think.

Brew: Blonde ale
Yeast: Fermentis US05
Mash temp: 152
OG: 1.040
FG: 1.000

Brew: Belgian Pale Ale
Yeast: Wyeast 3522 Belgian Ardennes
Mash temp: 150
OG: 1.045
FG: 1.005

Brew: Belgian Wit
Yeast: Wyeast 3944 Belgian Wit
Mash temp: 152
OG: 1.046
FG: 1.006

Brew: Nut Brown Ale
Yeast: Nottingham
Mash temp: 150
OG: 1.056
FG: 1.010

Brew: Cream Ale
Yeast: Fermentis US05
Mash temp: 153
OG: 1.050
FG: 1.006

Brew: American Pale Ale
Yeast: Fermentis US05
Mash temp: 154
OG: 1.051
FG: 1.006

Brew: American Pale Ale
Yeast: Wyeast 1272 American Ale II
Mash temp: 151
OG: 1.050
FG: 1.006

Brew: Belgian IPA
Yeast: Wyeast 3944 Belgian Wit
Mash temp: 148
OG: 1.074
FG: 1.008

Brew: DFH 60 Minute IPA Yoopers Recipe
Yeast: Wyeast 1272 American Ale II
Mash temp: 153
OG: 1.065
FG: 1.008

Is this kind of attenuation normal for all grain? I am not sure if I have a problem that needs solving or not. The beer is great! I never got this kind of attenuation with extract.


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Old 10-06-2012, 03:41 PM   #2
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They all seem to be finishing very low. Mash temps look good... How long do you mash? Is your sample at proper temp for your hydrometer calibration?


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Old 10-06-2012, 03:47 PM   #3
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Mash time is 60 minutes for any temp 152 or lower and 45 for 153 or higher. I do calibrate for temperature for a 68 degree reading. I thought they were finishing kind of low. I just can't figure out why, or if it is a problem.
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Old 10-06-2012, 04:08 PM   #4
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Most of those F.G. seem normal enough. But that blonde ale finishing at .000 does seem a bit off. That's really dry. Are you 100% sure that your hydrometer and thermometer are spot on?
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Old 10-06-2012, 04:31 PM   #5
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Yes I have used 2 different calibrated thermometers and I have 2 hydrometers that read the same. It's got me scratching my head. The beers don't seem overly dry or watery. I don't know that my palate is that great but the beers have the taste and body I am looking for. I always ask myself what problem am I trying to solve and maybe there is no problem if the beer is good.

Could it be unstable fermenting temperature? I ferment in my basement and the temp will fluctuate 2-4 degrees, between 64 and 68 degress. I leave all of my beers in primary for 3-4weeks.
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Old 10-06-2012, 05:17 PM   #6
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Like I stated in my earlier post. Those other F.G. seem pretty normal. But that blonde ale ending at .000 does seem weird. And if you want a more stable fermenting temp try a swamp cooler its not ideal but it might help. But if overall your beer taste good that's all that really matters!!!
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Old 10-06-2012, 05:56 PM   #7
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If the beers have the taste and body you're looking for, then what's the problem? Although you could end up with a higher abv ....you could always add some unfermentables like dextrin if you think you want a higher gravity.
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Old 10-07-2012, 03:16 PM   #8
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Just because you have two hydrometers that read the same, does not necessarily mean they are both accurate. Most of the hydrometers that I have owned were off by 2 - 3 points. You can easily check this by measuring a sample of water at the appropriate temperature. If it reads < 1.000, just add the error to each of your gravity readings.

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Old 10-07-2012, 04:23 PM   #9
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I bought myself an hydrometer just for finishing gravities. It's much easier to calibrate and it's much more precise.

Another thing to look for would be wild yeast. If you drink all your beer young, there could be something funky going on without it being apparent in the taste.
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Old 10-13-2012, 03:27 AM   #10
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I have also been getting very low FGs using US-05. I have made various pale ale recipes with OGs in the 1.065-1.080 range. The mash temps were in the low to mid 150s. All of them have had final gravities well under 1.010, typically 1.006. They taste decent, but they are dry and at least a percentage point higher in alcohol than the recipe indicated. I'm fairly certain that my thermometer and hydrometer are reading correctly. On one batch, I increased the mash temp to 160 to see what would happen, and I got a FG of 1.015. So increasing mash temp did seem to work. It just bothers me that my mash temp had to be increased by more than 5 degrees to get there. Also, I am making smaller batches (3.5 - 4 gallons into the fermentor) and pitching the entire yeast packet. I have wondered if that has anything to do with it.


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