ArticleFermentabilityYour beer's final gravity is determined by the fermentability of the wort and the action of the yeast. Find out how to control these factors in your homebrews.Already a member? Log InWritten by Bill PierceYou'll Also Like Article MEMBERS ONLY Insulation for Single Vessel Brewing What’s the best way to hold a consistent mash temperature for brew-in-a-bag brewing? We put the popular Reflectix insulation to the test. Article MEMBERS ONLY Hop Extracts - Advanced Brewing These hop extracts roughly fall into two categories, those primarily intended to add bitterness and those where aromatics are the goal.