LarryC
Well-Known Member
I plan on brewing my first all grain batch weekend after next. I have been reading How to Brew and coincidentally listening to a podcast from Brew Strong on sparging. In the podcast Jamil says that if you don't achieve the high enough efficiency (between 60% and 80%) you can just add some light DME to the boil to achieve the OG you should have gotten for your recipe.
My question is, how do you know you have the pre-boil OG you are supposed to have? I read Bobby M's all grain primer (www.suebob.com/brew) and know I can calculate the expected gravity and then calculate my efficiency for my mash/sparge. But all the recipes I see have the after boil OG listed not the pre-boil value. Do I Just calculate the 100% value of the grain bill and if my pre-boil gravity is in the 60 to 80% range range feel satisfied or is there something else to look at?
My question is, how do you know you have the pre-boil OG you are supposed to have? I read Bobby M's all grain primer (www.suebob.com/brew) and know I can calculate the expected gravity and then calculate my efficiency for my mash/sparge. But all the recipes I see have the after boil OG listed not the pre-boil value. Do I Just calculate the 100% value of the grain bill and if my pre-boil gravity is in the 60 to 80% range range feel satisfied or is there something else to look at?