I'm referring to pre-boil volume to counter for boil off. This is a general issue so it's not extract only but I will use that as an example. I brewed a Weizenbock this weekend and used 8.5lbs of DME. Obviously that takes up a lot of it's own space in the kettle so for example, if you were to fill for a 6 gallon pre-boil (5 gallon batch) and you start with 6 gallons, once you add the extract you are now up to over 7 gallons in the kettle and now you might not boil down to the final 5 gallons.
Another example is when I made my pumpkin. When I did mine I factored in that the 60oz of pumpkin is not a liquid but a mush that will likely mostly all settle out. So, I compensated with 60oz of top off liquid (I filled the cans with water to match up the fluid ounces and it matched the weight ounces). The thing though is my gravity came out a tad lower than expected - exactly the same as if I originally calculated for a 5.45 gallon batch with no pumpkin. But technically there was only 5 gallons of water and 60oz of pumpkin so I'm a bit confused as to why this is.
So I'm guessing when doing extract I should only fill to pre-boil volumes after adding in all the extract? Additionally since my pumpkin went into the boil at 30 minutes should I just ignore the extra volume and stick with the usual pre-boil volume? Sorry if any of this is worded confusingly.
Rev.
Another example is when I made my pumpkin. When I did mine I factored in that the 60oz of pumpkin is not a liquid but a mush that will likely mostly all settle out. So, I compensated with 60oz of top off liquid (I filled the cans with water to match up the fluid ounces and it matched the weight ounces). The thing though is my gravity came out a tad lower than expected - exactly the same as if I originally calculated for a 5.45 gallon batch with no pumpkin. But technically there was only 5 gallons of water and 60oz of pumpkin so I'm a bit confused as to why this is.
So I'm guessing when doing extract I should only fill to pre-boil volumes after adding in all the extract? Additionally since my pumpkin went into the boil at 30 minutes should I just ignore the extra volume and stick with the usual pre-boil volume? Sorry if any of this is worded confusingly.
Rev.