How much grain can you fit in a 10gal mash tun?

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Tonedef131

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I have a ten gallon Rubbermaid beverage cooler with a false bottom as a mash tun. I know this is a pretty common setup so I want to see how much grain those of you with the same system can fit into it.

I do ten gallon batches and have never had a problem with too much grain to fit. However, the most I have ever put in was about 24lbs and if I can remember right I think it was pretty close to the top. I have a recipe I want to make that would feature a 27 or 28lb grain bill plus some rice hulls. Will this fit or will I not be able to fit enough water in there for the mash? I am alright with having to do an extra sparge, but would hate to be mashing in and realize I can't fit it all.
 

ohiobrewtus

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I can mash 25# in my 10g cooler. That gets me 10g of 1.060 beer.
 
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Tonedef131

Tonedef131

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I already do two sparges, I was saying I wouldn't mind having to do a third. It looks like if I do about 1 qt/lb ratio I can fit it without an issue, this eases my mind.
 

davesrose

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The greenbay rackers calculators are great....I use them for figuring my mash temps. But one thing to keep in mind about the "Can I Mash it?" is that it's not taking your false bottom into account. Dunno about yours, but I figure an extra .5 gallons (to air on the safe side) because of the empty space. Looks like with some attention, 28lbs is possible....just depends on the way you mash. I like doing step these days (and fly sparge), and with that method I found 21-22lbs got me right to the top of my 10g rubbermaid. Single mash, though, I'm sure you could fit more grain in.
 
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