--- title: "Pizza Oven Dome Cracked Inside or Out After Rain or a Big Fire: Causes and Fixes" description: "A pizza oven dome cracked shows as lines in the inner brick or refractory ceiling, cracks through the outer render or stucco, or smoke and light slipping…" url: "https://pizzaovenrepair.center/problems/pizza-oven-dome-cracked/" --- # Pizza Oven Dome Cracked Inside or Out After Rain or a Big Fire A pizza oven dome cracked shows as lines in the inner brick or refractory ceiling, cracks through the outer render or stucco, or smoke and light slipping through a gap in the shell. ## What it usually means. A dome is built in layers: a refractory inner shell that takes the fire, insulation around it, and an outer skin of render, stucco, tile or steel that keeps the weather out. Hairline cracks in the inner shell are common after the first seasons and usually close up as the oven heats. Cracks in the outer skin are more serious, because they let rain reach the insulation. A dome soaked by rain, then fired hot the next day, fills with steam that pushes cracks wider, and a cold night can freeze that water in the joints. The classic cause of a badly cracked dome is the same as for the floor: a new oven fired too hot too soon, before curing drove its water out slowly. Big fires on a regular basis, a door shut on a roaring fire, and a stand that settles also open cracks. What to look for is width and whether anything passes through. A crack that lets smoke out through the outer skin, or shows light from inside, means the shell is no longer sealed and the oven is not fired until it has been looked at. The 6 causes, cheapest first Answer these first 01 Is the crack inside, on the outer skin, or does it run through both? 02 Does smoke leak from the outside of the dome during a fire? 03 Was the oven left uncovered in rain before the crack appeared? 04 Was it a new oven fired hot in its first weeks? 05 Is the crack growing from firing to firing? ## Check these before you book. Pizza oven dome cracked: 5 checks, and none of them costs anything. 01 Look at the dome both inside and outside while cold, and photograph each crack with a coin beside it for scale. 02 Keep a dome covered between uses, and after rain fire it gently at first to dry it out. 03 During a fire, look for smoke seeping from the outer skin; if you see any, let the fire die and do not fire it again until it is checked. ### Also worth checking - Follow the maker's curing schedule on a new or repaired oven before any full-size fire. - Stay off the top of the dome and off any roof above it; the technician inspects from the ground and from a ladder. ### How soon does it need a visit? A cracked dome is not urgent unless smoke or flame comes through the outer skin. Then the fire is let die, the oven is not used, and the dome is booked for repair. ## The causes, cheapest first. 6 things pizza oven dome cracked inside or out after rain or a big fire turns out to be, from hairline cracks in the inner shell to stand or slab settling. [The cost guide](https://pizzaovenrepair.center/cost/) 1. 01 no repair ### Hairline cracks in the inner shell Fine cracks that close as the oven heats are expected in refractory. They are watched rather than patched. No repair: check it yourself 2. 02 low to moderate ### Rain soaking an uncovered dome Water in the insulation and the render turns to steam at the next firing and opens cracks. The skin is sealed or patched, and the oven dried with slow fires and a cover between uses. [Fixed by pizza oven floor and dome repair](https://pizzaovenrepair.center/services/pizza-oven-floor-and-dome-repair/) [On a wood-fired pizza oven](https://pizzaovenrepair.center/types/wood-fired-pizza-oven-repair/) 3. 03 low to moderate ### Freeze and thaw in the outer skin Water in hairline cracks on a cold night expands as it freezes and pries the render apart. The cracks are cleaned out and sealed with a breathable patch. [Fixed by pizza oven floor and dome repair](https://pizzaovenrepair.center/services/pizza-oven-floor-and-dome-repair/) 4. 04 moderate ### Curing skipped or rushed A new dome fired hard before its water left cracks through the shell. The cracks are filled with refractory mortar and the oven cured again slowly. [Fixed by pizza oven floor and dome repair](https://pizzaovenrepair.center/services/pizza-oven-floor-and-dome-repair/) 5. 05 moderate to highest ### Shell cracked through, smoke leaking out A crack that passes smoke through the outer skin means the shell no longer holds. It is opened, repaired in refractory and resealed, or a section of the dome rebuilt. [Fixed by pizza oven floor and dome repair](https://pizzaovenrepair.center/services/pizza-oven-floor-and-dome-repair/) 6. 06 moderate to highest ### Stand or slab settling A support that sinks unevenly twists the dome and splits it from the base up. The base is checked and made level before the dome is repaired. [Fixed by pizza oven floor and dome repair](https://pizzaovenrepair.center/services/pizza-oven-floor-and-dome-repair/) ## What else it could be. Most often confused with pizza oven floor cracked: split tiles, lifted bricks, crumbling stone, then pizza oven smoke filling the room instead of leaving by the flue. [All problems](https://pizzaovenrepair.center/problems/) Codes that come with it - [`Day 1 of 5 (curing screen)` Marra Forni · Mode, not a failure](https://pizzaovenrepair.center/error-codes/marra-forni-day-of-5/) Also related - [**Pizza Oven Not Getting Hot Enough to Bake a Crisp Crust** 7 causes](https://pizzaovenrepair.center/problems/pizza-oven-not-getting-hot/) ### Pizza Oven Floor Cracked: Split Tiles, Lifted Bricks, Crumbling Stone 6 causes Gas, fire or smoke at the oven ### Pizza Oven Smoke Filling the Room Instead of Leaving by the Flue 6 causes ### Wood-Fired Pizza Oven Smoking Heavily Out of the Chimney Top 6 causes ## The makes it happens on. 16 makes on this site; pizza oven dome cracked inside or out after rain or a big fire can show up on any of them. Each mark opens that make's own page. [All 16 brands](https://pizzaovenrepair.center/brands/) ## Pizza Oven Dome Cracked Inside or Out After Rain or a Big Fire, where we come out. 9 metros, each with its own page. 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A hairline crack inside is usually fine. A crack that lets smoke or flame out through the outer skin is not, because heat is reaching places it should not. ### How long should a new pizza oven be cured? It varies by maker and by material, but it usually means a series of small fires over several days, each a little hotter. The manual for that oven gives the schedule. ### Does a cover really matter for a wood-fired oven outdoors? Yes. Rain soaking into the dome is one of the most common causes of cracks. A breathable cover between uses keeps it dry. ### Can dome cracks be sealed with ordinary caulk? No. It burns out or traps water. Inner cracks need refractory mortar, outer ones a patch that suits the render, applied with the oven cold. --- **[Read on the site: Pizza Oven Dome Cracked Inside or Out After Rain or a Big Fire: Causes and Fixes](https://pizzaovenrepair.center/problems/pizza-oven-dome-cracked/)** **[Book a visit with PizzaOvenRepair.center](https://pizzaovenrepair.center/schedule/)**