90%+ ADF - is this even possible?

[dachoe]

I brewed an American brown that had a 91% ADF. Here are the stats:

OG: 1.060
FG: 1.005 (yah... 1.005)
ADF: 91.3%
ABV: 7.25%

Mash 152F 60 min (was aiming for 154F, but was too drunk and too pissy from an epic stuck mash to bother -_-)

75.5 4.25 lbs. Pale Malt(2-row)
5.9 0.33 lbs. Wheat Malt
7.1 0.40 lbs. Cara-Pils Dextrine Malt
7.1 0.40 lbs. Crystal 40L
4.4 0.25 lbs. Chocolate Malt

Fermented at 67F with WLP001 (California Ale Yeast), and left it there for 2 weeks before racking into a keg.

If you're wondering about the tiny amounts of grain, I do 2.5gallon batches, bc I don't drink that often, I just like to brew.

I like to think that my sanitation is pretty good. After the boil, I cover the kettle. I use Star San to sanitize everything, and that's after a good cleaning with PBW.

Anyone else get this kind of attenuation?

 

[GNBrews]

My thought is that your bulk mash temperature was actually less than 152F; producing a very fermentable wort. Either your thermometer is off, or the mash wasn't fully homogeneous.

 

[defenestrate]

i agree with GNBrews that the mash was probably lower or not consistant temps...i've had an amber ale hit 88% and i narrowed it down to that... that was with S-05. do get a good consistant temp i need stir my mash every 3-5 min for the first 15 min.

do you take temps from different areas in the mash, or just one? is your thermometer calibrated? just things to consider.

i'm in the process of brewing a brown right now, yours sounds yum. our recipes are fairly close, if you change out victory for the wheat we are dead on.

 

[dachoe]

i agree with GNBrews that the mash was probably lower or not consistant temps...i've had an amber ale hit 88% and i narrowed it down to that... that was with S-05. do get a good consistant temp i need stir my mash every 3-5 min for the first 15 min.

do you take temps from different areas in the mash, or just one? is your thermometer calibrated? just things to consider.

i'm in the process of brewing a brown right now, yours sounds yum. our recipes are fairly close, if you change out victory for the wheat we are dead on.

I do stir the mash around for a while, and take readings in several different places (bottom, top, middle, sides) but it's still possible that I didn't get a good reading. I double check next time.

 

[defenestrate]

I do stir the mash around for a while, and take readings in several different places (bottom, top, middle, sides) but it's still possible that I didn't get a good reading. I double check next time.

maybe the thermometer is off? who knows. i'm sure you will enjoy the beer regardless