OMG - My first post in the US of A!
Thirsty, you've done a top job at describing BIAB* and I'm sure the guys here will enjoy it as much as we have in Oz. I reckon we could add your description into the AHB Wiki.
Here's one or two corrections that I'd whack in though plus a couple of other thoughts...
1. Mashing Time: Mashing time is as normal. No need to stretch it out. Brad_G and I did some iodine tests while brewing side by side and both brews converted within minutes of each other - about 35 minutes from memory.
2. Efficiency: Tests have shown that BIAB gives higher efficiency. Efficiency into boiler is from 5 to 9% higher than batch-sparging so no problems in this area either.
3. No Need to Raise to Mash Out: I usually just pull the bag out at my mashed temperature. I might give this a go next time as a matter of interest though.
4. Maintaining Mash Temp: I don't have any insulation on my kettle. When mashing I like to check the temp regularly during the first 20 minutes, giving it a good stir each time. If it needs a bit of heat, I just hit it with a little flame. Rarely needs it though.
4. There is Room for Technology Buffs: This is an area that we haven't worked on much but I'm dead keen. I actually want to change my bag to a very fine mesh (like a fish frying basket). I think there's a pic of a great one that FingerlickinB made in the following thread
http://www.aussiehomebrewer.com/forum/inde...showtopic=11074 which was the catalyst for BIAB - good on you James Squire!
I also generally brew two different types of beer in one session and am currently thinking of building a setup where I can do two brews simultaneously. I'll have to buy another pot and burner but that's it.
Anyway, that's all for now. All of us BIAB guys will look forward to hearing how you go and I'm sure you'll keep Thirsty busy answering all your questions
Special thanks to all the AHB guys who got BIAB under way. You'll see some of their names in the first thread Thirsty linked and there are more that need to be added. A quick mention though to jimmysuperlative, AndrewQLD, AdamT, Phrak, Coodgee, Ross, sjc and Trough Lolly - I better stop now!
Cheers all,
PP
*Screwtop came up with the BIAB abbreviation and was very encouraging and supportive of this method before we even had a chance to test it out. If you get a chance to read any of his posts on AHB, then do. He's bloody funny!