ClemTiger0408
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I'd do it all grain biab- you'll thank me later. There is no reason to do traditional AG anymore (as detailed in Other threads)- traditional all grain is a equivalent of using a flip phone these days. Use an extra pound of the base grain (13.8 lbs pilsner) to compensate for efficiency loss since this is your first time.
You will have to start with more than 5 gallons because you lose water from evaporation during the boil and from grain absorption. You can probably assume an boil off rate of 1-1.5 gallons per hour for your first brew, but keep track of your pre and post volume so you can calculate your boil off rate specific to your pot that you can use for your next brew.
Use this link to figure out water volume to start with:
https://pricelessbrewing.github.io/BiabCalc/
I usually do a 90 min mashes with biab. Not sure it matters- people get by with much shorter mashes, but certainly doesn't hurt.
The other advice I can give you regarding biab is to squeeze the bag like it owes you money. A good way is to use two nested 5 gallon buckets with holes drilled in the bottom and sides of inner bucket so as bag is squeeze wort falls into bottom bucket. You won't need to sparge if you use a pound more of base grain and you squeeze the bag good enough.
You only need one vial of yeast if you're making a starter. Google "yeast calculator" and use one of them to see how to make the starter. 1 vial of yeast would probably work, but would not be optimal.
https://www.homebrewtalk.com/showthread.php?t=233289
I don't love this post and I know it could open up a huge debate. But to say the "traditional" method of all grain is like a flip phone is somewhat disingenuous. I went from BIAB to a 10 gallon Igloo mash tun after a year of doing BIAB.
BIAB is a great way to enter all grain since the equipment requirements are much less and process is easier, however, the trade off is BIAB is kind of a pain.
With BIAB, in order to have a half decent efficiency (I know this doesn't matter a ton) I had make sure the LHBS double crushed my grain, do a 90 minute mash, stir the crap out of the mash every 20 minutes, pull out my ladder from storage so I can set up a pulley, and then squeeze the ever living daylights out of an extremely hot and heavy bag.
Now, I can single crush my grains, do a 60 minute mash, and simply drain the wort from the mash tun into the kettle. The time is about the same but the work is way less and I improved my efficiency by about 6 percentage points. And all I needed was about $60 to build a mash tun (I still use a bag for the filter instead of a false bottom).
My only point here is that BIAB is a different method for mashing than traditional but I wouldn't say its better or worse. For me, like I said, I did BIAB for more than a year and then switched to using a mash tun and haven't once looked back.