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-   -   BIAB, why mashout? (http://www.homebrewtalk.com/f36/biab-why-mashout-309533/)

sivdrinks 03-02-2012 12:40 PM

BIAB, why mashout?
 
If I'm understanding it's purpose correctly I don't see the need for one with BIAB. Any arguments? For the record I'm using a keggle and no sparge.

Seven 03-02-2012 12:43 PM

You can skip it if you are happy with your efficiency and have no problems hitting your target gravity. If not, a mashout is a good tool to improve efficiency and help you hit your gravity numbers.

FlyDoctor 03-02-2012 12:43 PM

Haven't done biab yet, but I read that a mash out will help "liquify" the grains so that you will get more wort draining from the bag without squeezing, but would love to hear an expert chime in.

william_shakes_beer 03-02-2012 12:48 PM

I also would like to hear the theory behind the effeciency increases proposed by mashing out. I will also copy the OP to the brew science forum

Rev2010 03-02-2012 12:50 PM

Makes simple sense. Ever notice how it takes longer to wash the soap off your hands with cold water than it does with hot water?


Rev.

MalFet 03-02-2012 12:50 PM

I have to confess that I'm quite skeptical of any claim that pins higher efficiency on a mash-out. I'm sure it happens, but to me that suggests that conversion hadn't completed and that the mash-out is acting like a crutch. I certainly wouldn't want my grains liquified (:D) and temperatures effect on solubility isn't relevant here. I see no reason to mash out with BIAB, particularly no sparge versions.

sivdrinks 03-02-2012 12:54 PM

Wouldn't the higher temp create a thicker less ABV beer though? Not sure how that doesn't actually hurt efficiency. I'm using a custom bag that fits my keggle and use a good bit of water, my absorption is pretty low.

Seven 03-02-2012 12:56 PM

My understanding is that it makes the grain bed more liquid which allows the wort and sugars to make it into your brew kettle vs. staying stuck to the grain when you lift them from the kettle. I haven't done any scientific experiments to prove any theories either way about this ... mainly because doing a mashout is so simple that I've always just done them.

MalFet 03-02-2012 12:56 PM

Quote:

Originally Posted by sivdrinks (Post 3849626)
Wouldn't the higher temp create a thicker less ABV beer though? Not sure how that doesn't actually hurt efficiency. I'm using a custom bag that fits my keggle and use a good bit of water, my absorption is pretty low.

Are you talking about fermentability from different mash temps? Sure, that's true, but a mash out doesn't (or shouldn't) affect that.

MalFet 03-02-2012 01:01 PM

Quote:

Originally Posted by Seven (Post 3849638)
My understanding is that it makes the grain bed more liquid which allows the wort and sugars to make it into your brew kettle vs. staying stuck to the grain when you lift them from the kettle. I haven't done any scientific experiments to prove any theories either way about this ... mainly because doing a mashout is so simple that I've always just done them.

All of the sugars should already be solubilized by the end of 60 minutes. It wouldn't stick to the grain, unless you are suggesting that cold husk absorbs more water than warm husk does. If you're water's not penetrating the grain husk properly then a mash-out might help by providing ramped-up activity at the end, but in reality that's the sign of a bad crush.

I don't really BIAB, but I do alternate consistently between a 170F sparge and a 60F sparge with absolutely zero difference in my efficiency.


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