All-Grain Brewing Basics

Why Go All-Grain

All-grain brewing replaces malt extract with a full grain {{glossary:mashing}} step. You crush the grain yourself, convert its starch to sugar with hot water, and separate the sweet wort before boiling. This gives you complete control over flavor, body, color, and fermentability.

What Changes

The main addition is the mash step, which requires a vessel capable of holding grain and water at a stable temperature for 60 minutes. Everything else — boiling, hopping, cooling, fermenting — remains the same as extract brewing.

Equipment Additions

Mash tun — An insulated vessel with a false bottom or manifold for separating wort from grain. A converted cooler is the most popular DIY option. Alternatively, a Brew-in-a-Bag (BIAB) setup uses your existing kettle with a large mesh bag.

Larger kettle — Full-volume boils require a 10-15 gallon kettle. Partial boils and top-offs are no longer used.

Grain mill — Crushing your own grain ensures the right consistency. Many homebrew shops will crush grain for you, but a personal mill pays for itself quickly.

The Mash

Add crushed grain to the mash tun and mix with hot strike water. The target mash temperature is typically 148-158 F (64-70 C). The water-to-grain ratio is usually 1.25-1.5 quarts per pound.

Strike water temperature should be calculated to account for the grain absorbing heat. A common rule of thumb: strike water should be 10-15 F above your target mash temperature.

Hold the mash at temperature for 60 minutes. During this time, enzymes (beta-amylase and alpha-amylase) convert grain starch into fermentable and unfermentable sugars.

Vorlauf

After the mash rest, recirculate the first quart or two of runoff back into the mash tun. This clears the wort of grain particles and sets the grain bed as a filter.

Sparging

Rinse the grain bed with hot water (168-170 F) to extract remaining sugars. Batch sparging (drain, refill, drain) is simpler. Fly sparging (continuous gentle flow) is more traditional. Both achieve similar efficiency for homebrewers.

Brew-in-a-Bag (BIAB)

BIAB simplifies all-grain by eliminating the separate mash tun. You mash directly in your kettle inside a large mesh bag. When the mash is complete, lift the bag, let it drain, and proceed to the boil. BIAB is space-efficient, affordable, and produces excellent beer.

Efficiency

All-grain brewers measure brewhouse efficiency — the percentage of available sugars actually extracted from the grain. Beginners typically achieve 60-70%. With practice, 72-78% is normal. Adjust grain quantities to hit your target original gravity.

The Reward

All-grain brewing takes longer (5-7 hours) but delivers unmatched recipe flexibility and a deeper understanding of the brewing process. Once you taste the difference — and feel the satisfaction of building a beer from raw grain — there is no going back.