Will this FB work for a biab?

I'm normally a traditional all grain brewer but winter in Wisconsin keeps me inside due to chilling in sub zero temps. I've tried biab before but didn't have much luck. So I'm bringing it inside to give it another shot. My question is will a cut off sanke keg top work so I can heat my mash if I loose temp without scorching the grains? My process will be to mash on an electric stove inside, boil outside and bring back in to chill with an IC.. I don't plan on making any holes in the FB, will it work as is? Thanks in advance..

Side note, I'm only doing 3.5 gallons so I don't kill my back...lol

 

Don't think I understand the question. Anything you can heat that will hold enough water will work if you can maintain the mash temp.

 

You could get superheated wort under the keg top, darkening or scorching the wort. I'd drill holes into it.

 

I'm confused. Why do you need a false bottom for BIAB?

I never used one. The bag replaces the FB.

 

OOPS Didn't understand FB. Now I know what it stands for. LOL

 

to keep the bag off the bottom of the kettle so when it's heating it doesn't scorch the bag or grains..

 

I did about a dozen BIAB brews and never had a scorching issue. The liquid keeps the temps even and prevents hot spots.

 

there's still the large hole the dip tube from a sanke would go in to, I didn't weld that up or anything. Ya think that's good enough or should I still drill some holes?

 

You could always try it for one batch, if the wort superheats under it, you'll hear it when it lifts up for sure, it makes quite a clang- My Blich. False bottom has done this to me, it has very small slits, though.

 

Why are you heating while you have the bag in there? I just heat the water to strike temp, drop in the bag and stir the grains in. Slap a lid on, wrap it with some kind of insulation and let it sit. If your grains are milled fine you don't need a long mash. I've been very successful with a thirty minute mash and the temperature stays pretty constant. I've been tempted to shorten the mash time even more yet.