It is important that you insulate your pizza oven, and for this I have used a Ceramic Fibre Blanket. It is both easy to work with, and gives excellent insulation.
Fireproof Insulation: This ceramic insulation blanket rated for temperatures up to 2400F is a fire resistant material that is non combustible with
Ceramic Fiber Insulation Blanket, 1 x 24 x 32, 8# 2400F, Fireproof Insulation Blanket for Forge, Furnaces, Kilns, Chimney, Stoves, Fireplace, Pizza
Ceramic Fiber Insulation Blanket Roll 8#, 2300F, (1 x 24 x 25 Feet) Wood Stoves, Pizza Ovens, Kilns, Forges : Arts, Crafts & Sewing
Insulation Blanket - Pizza Oven - Forno Bravo
Kiln blankets, fiber, and Inswool - The Ceramic Shop
Fireproof Insulation: This ceramic fiber insulation blanket is a high heat resistant & fireproof blanket, rated up to the temperature of 2400F, and measures 1 x 24 x 60 in size, density 8 lbs/ft3. Applications: This fireproof insulation blanket is used as insulation for forge, stove, oven, chimney, furnace, boiler, foundry, and fireplace. Can be used for welding, glass blowing, muffler packing.
Simond Store Ceramic Fiber Blanket, 2400F 8#, 1 x 24 x 75, High Temperature Insulation Blanket for Wood Stove Forge Furnace Fireplace Kiln
Ceramic Fibre Blanket - Half Roll
FORTLUFT Ceramic Fiber Insulation Exhaust Muffler Mat Packing – FORTLUFT Auto Parts
1260c Heat Resistant Ceramic Fiber with Aluminum Foil Pizza Oven Insulation Blanket - China Ceramic Blanket, Ceramic Fiber Blanket
Simond Store BS9 Number 8 Density Low Thermal Ceramic Fiber Insulation Blanket, 1 Piece - Kroger
How to insulate a wood-fired pizza oven - Fuego Clay Ovens
Custom Made Pizza Ovens – Moderncabins