ROCKSHEAT Cordierite Pizza Stone 13.2" Square for Ooni & Uuni 12" Ovens — 0.4" Thick, High Thermal Mass

ROCKSHEAT's 13.2" x 13.2" x 0.4" cordierite pizza stone recreates brick-oven heat to deliver crisp, evenly browned crusts in Ooni, Uuni and other compact pizza ovens.

If you bake pizza, bread, cookies or reheat store-bought pies and want a reliably crispy base, this square cordierite stone is designed to bring commercial-style results into a home or backyard setup. Made from heat-stable cordierite and fired at very high kiln temperatures, the stone absorbs moisture from dough and spreads heat uniformly so you avoid hot spots and soggy centers. It’s sized to work seamlessly in popular 12" outdoor pizza ovens including Ooni Fyra 12, Ooni Koda 12, Volt 12, Ooni 3, and Uuni 2/2S while also fitting small countertop ovens and grills.

How does this stone create a pizzeria-style crust?

The cordierite material has excellent thermal mass and moisture absorption, which pulls water from dough and delivers quick browning on the bottom of the crust. Even heat transfer prevents localized burning and produces the blistered, chewy exterior typical of brick ovens. Because it’s fired at high temperatures in manufacturing, it tolerates rapid heating cycles with minimal cracking risk under normal use.

• High thermal mass for even heat distribution
• Moisture absorption yields crisp bottoms
• Fired in a 2200°F kiln for stable, food-safe composition
• Rated to resist up to 1400°F during cooking

Will this stone fit my Ooni or Uuni 12" oven?

The stone is cut to 13.2" square with a 0.4" thickness to match the footprint and clearance used by Ooni Fyra 12, Ooni Koda 12, Volt 12, Ooni 3, and Uuni 2/2S. It’s intended as a direct replacement or upgrade for those ovens and will also work in similarly sized grills and countertop ovens.

• Compatible with Ooni Fyra 12 and Koda 12
• Works with Volt 12, Ooni 3, Uuni 2 and Uuni 2S
• 0.4" thickness balances heat retention and manageable weight
• Square shape maximizes usable baking surface in compact ovens

How should I use and care for the cordierite stone?

Preheating the stone fully is essential—allow at least 30 minutes at 500°F (250°C) or longer in higher-temperature ovens so the stone reaches even internal heat. Clean simply with water and a brush once cooled; avoid soap and never submerge a sizzling hot stone into cold water. For very wet or oily dishes, use a metal pan or baking sheet on top of the stone to protect it from direct grease contact.

• Preheat stone at minimum 500°F (250°C) before baking
• Wash only with clean water and a brush after cooling
• Use a pan for oily deep-dish or saucy foods to prevent staining
• No seasoning required—ready to use out of the box

Is this stone durable and food-safe?

Manufactured by a specialist stoneware producer with over a decade of experience, the ROCKSHEAT cordierite stone is fired at extremely high temperatures to ensure structural integrity and food safety. The cordierite formula resists thermal shock under normal baking conditions and contains no harmful additives or kiln odors once fully fired.

• Burned in a 2200°F kiln to remove impurities and odors
• Thermally stable up to 1400°F (800°C) during cooking
• Food-grade stoneware composition—no harmful substances
• Designed for years of household use with proper care

Who this is for: Home bakers and outdoor pizza enthusiasts who want commercial-style crusts from compact ovens and grills, owners of Ooni and Uuni 12" ovens seeking a reliable replacement or upgrade, and anyone who bakes bread, cookies or reheats pizzas and values a crisp base. If you want a ready-to-use, durable cordierite stone that handles high heat and delivers consistent results, the ROCKSHEAT 13.2" square stone is built for that purpose.