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Why the protein rest? If using modified malts the protein rest is unnecessary. Its also a pain in the ass. Unless you are using a lot of unmodified malts, then do your self a favor and skip it. The purpose is to break up proteins in unmodified malts or unmalted grains. In fully modified malt the protein rest will actually reduce body and head retention. Also too long of a protein rest will result in the same "thin" beer.
Read this section of "How To Brew"
http://www.howtobrew.com/section3/chapter14-4.html
In fact if you haven't already, you should read the whole book cover to cover.
If you still want to step mash in a BIAB setup be sure to keep the bag off the heat source (direct fire or electric element) as the bag will burn through. Ask me how I know. Or do a decoction to raise the temperatures. This can be dificult because if you don't get the decoction boiled and back in the mash , and the temperature raised in time, the protein rest will go long.
A lot of extra work and very little return for a "simple summer lawnmower beer".
Read this section of "How To Brew"
http://www.howtobrew.com/section3/chapter14-4.html
In fact if you haven't already, you should read the whole book cover to cover.
If you still want to step mash in a BIAB setup be sure to keep the bag off the heat source (direct fire or electric element) as the bag will burn through. Ask me how I know. Or do a decoction to raise the temperatures. This can be dificult because if you don't get the decoction boiled and back in the mash , and the temperature raised in time, the protein rest will go long.
A lot of extra work and very little return for a "simple summer lawnmower beer".