Quick Answer: Whether your pizza oven needs extra insulation depends entirely on how it’s built. Ovens like the Ooni Karu series and Gozney Roccbox/Arc already have a ceramic fiber layer sandwiched between their inner and outer steel walls from the factory, so there’s nothing to add. Thin single-wall steel ovens and DIY brick or masonry builds lose heat much faster, and wrapping them in an aftermarket ceramic fiber blanket — the same material used in kilns and forges, usually rated to 2,300°F — is a cheap, well-documented fix that retailers report can boost heat retention and cut firewood or pellet use by roughly a quarter to a third.
Insulation is one of the least glamorous upgrades in this niche, which is exactly why it’s easy to overlook: it doesn’t change how a pizza looks or how an oven photographs, but it changes how much fuel you burn and how consistently the oven holds temperature on a windy or cold night. This guide covers how to tell whether your oven already has it, what to buy if it doesn’t, and how to install it safely.
Pizza oven insulation, by the numbers
- 2,300°F: the typical maximum-use temperature rating for ceramic fiber insulation blanket sold for ovens, kilns, and forges — well above what any consumer pizza oven reaches internally, so there’s no risk of the material itself becoming the limiting factor.
- 25-35%: the performance gain multiple ceramic fiber blanket retailers (including BrickWood Ovens) report for wood-fired ovens after adding an extra insulation layer — reaching higher temperatures with less firewood and holding heat longer between reloads.
- 1”x24”x25’: a common single roll size, sufficient by retailer sizing guidance to wrap two full layers around most home wood-fired or charcoal pizza ovens.
- 6-8 lb/cu ft: the typical density range for consumer ceramic fiber blanket — dense enough to hold its shape once wrapped, light enough to cut and handle by hand with basic tools.
Which ovens already have it (and which don’t)
Multi-fuel ovens built around a double-wall steel body — the Ooni Karu 12 and Karu 16 chief among them — ship with ceramic fiber insulation packed between the inner cooking chamber and the outer shell, which is part of why they reach high temperatures relatively quickly on wood or charcoal. Gozney’s Roccbox and Arc use the same double-wall-plus-fiber approach. See our Ooni Karu 12 vs 16 comparison if you’re still deciding between insulated models.
The ovens that actually benefit from an aftermarket blanket are thinner single-wall steel designs — common on budget gas ovens and some portable charcoal models — and DIY masonry or brick builds, where insulation isn’t optional at all: a dome oven without a proper insulation layer under its render coat will crack from thermal stress and never hold heat efficiently, regardless of how well the brickwork itself is done. If you’re building one from scratch, see our how to build a pizza oven guide for where the insulation layer fits in a Pompeii-style dome build.
Ceramic Fiber Insulation Blanket (2,300°F, 8lb Density)
- Wraps around a single-wall steel oven body or lines a DIY masonry dome before the outer render coat.
- A 1"x24"x25' roll covers most home ovens with two full wraps for the reported 25-35% performance gain.
- Wear gloves, safety glasses, and a dust mask while cutting and handling — the loose fiber is a skin and lung irritant until it's fully wrapped and enclosed.
If you’re stocking up on the safety gear to handle it — Amazon Fresh covers the same-day grocery run for pizza night while your oven wrap or dough cure is in progress, so the two don’t have to compete for a separate errand.
How to install it
Cut the blanket to size with heavy scissors or a utility knife (wear the gloves and mask throughout — this is the step that generates the most loose fiber), then wrap it snugly around the oven body, securing it with high-temperature wire, tie wraps, or the housing itself if your oven has an outer shell that clamps over the insulation layer. Two overlapping layers is the standard recommendation for a real performance difference; a single thin layer does less. On a DIY masonry build, the blanket goes on before the render or stucco coat, sandwiched directly against the brick or refractory dome — it’s a structural step in the build, not an add-on afterward.
Heat-Resistant Work Gloves
- The same gloves rated for pulling a pizza also protect your hands from loose ceramic fiber during install.
- Look for a rating around 500-900°F if you'll also use them oven-side for peels and stones.
Insulation by oven type
| Oven type | Factory insulated? | Worth adding blanket? |
|---|---|---|
| Ooni Karu 12/16 | Yes — ceramic fiber between double walls | No |
| Gozney Roccbox / Arc | Yes — double-wall + fiber | No |
| Single-wall steel gas ovens | No | Yes — biggest fuel/heat-retention gain |
| DIY brick/masonry dome | No, unless built in | Required — structural, not optional |
| Portable charcoal ovens | Varies by model | Check specs; often benefits |
Confirm your specific model's construction against the manufacturer's spec sheet before buying — "double-wall" doesn't always mean insulated, and some newer single-wall ovens use reflective liners instead of ceramic fiber.
FAQ
See the frequently asked questions below for whether your oven needs insulation, what it’s made of, handling safety, cost, and warranty considerations.
Bottom line: if you own a Karu, Roccbox, or Arc, skip this upgrade — it’s already built in. If you’re running a single-wall steel oven or building a masonry dome from scratch, a ~$30-50 roll of ceramic fiber blanket is one of the cheapest, best-documented upgrades available, with retailers reporting 25-35% better heat retention and lower fuel use for a 20-30 minute wrap job. Pair it with proper pizza oven cleaning and maintenance to get the most out of either an insulated or newly-wrapped oven.