We have used 11 lbs of bohemian pilsner and 1.1 lbs of CaraMunich II and according to the calculator we had 75% preboil efficiency but only 59% afterboil gravity.
Here is the recipe: http://www.brewtoad.com/recipes/cc16-cc8-clone
Our preboil gravity was 1.039 at 8.84 gallon wort and our afterboil gravity with a 1.54 gallon boil off (plus another gallon as trub, shrinkage, etc) was 1.042 at 6.3 gallons.
I like the preboil efficiency, but the afterboil is way to low. Is it supposed to be this low with 6.3 gallon final wort brewed from 12.1 lbs of malts?
Any thoughts on this?
By the way....this is a BIAB with 9.24 total water for mashing. No sparging at all.
Thanks a lot.
UPDATE: both the refractometer and the hydrometer are calibrated. I use them at room temp and if the wort is warmer I use a thermometer and correct the reading.
I take the OG reading just before I pitch and the wort is all stirred and aerated by then. I use a laddle to get wort from the middle of the fermentor.
Here is the recipe: http://www.brewtoad.com/recipes/cc16-cc8-clone
Our preboil gravity was 1.039 at 8.84 gallon wort and our afterboil gravity with a 1.54 gallon boil off (plus another gallon as trub, shrinkage, etc) was 1.042 at 6.3 gallons.
I like the preboil efficiency, but the afterboil is way to low. Is it supposed to be this low with 6.3 gallon final wort brewed from 12.1 lbs of malts?
Any thoughts on this?
By the way....this is a BIAB with 9.24 total water for mashing. No sparging at all.
Thanks a lot.
UPDATE: both the refractometer and the hydrometer are calibrated. I use them at room temp and if the wort is warmer I use a thermometer and correct the reading.
I take the OG reading just before I pitch and the wort is all stirred and aerated by then. I use a laddle to get wort from the middle of the fermentor.