« on: January 21, 2013, 08:04:12 PM »
when i biab-ed, i would mash for at least 90 minutes. i built a "jacket" for the kettle out of 1" foam sheathing from home depot. it held temps pretty well. i never sparged and never worried about ph and still hit about 72-74% every time. i also found i needed to hit higher strike water temps to hit mash temps i wanted on my system.
my first suggestion is to mash longer. the research i did and the results i had show 90 minutes plus for a biab mash is a good thing. second suggestion, mill twice if you can. i did and while it didn't noticeably add points to efficiency, it didn't take them away.
hope this helps.