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Post by fi84275 on Jul 5, 2020 11:56:47 GMT
Hello everyone,
Just built an oven and coated the inside with AA fire clay and as it has dried i have ended up with horrendous cracks all over it. How do I go about fixing it?
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Post by fi84275 on Jul 5, 2020 12:03:34 GMT
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Post by downunderdave on Jul 5, 2020 19:23:03 GMT
Hello everyone, Just built an oven and coated the inside with AA fire clay and as it has dried i have ended up with horrendous cracks all over it. How do I go about fixing it? You don’t say how thick the applied coating was or why you did it. Brick ovens are usually not coated on the interior, likewise castable refractory. A thin coating of any material is prone to cracking or flaking. Clay is particularly bad because of its high shrinkage. To reduce this a mix of equal parts by volume of clay,fine sand and hydrated lime would be a better candidate but should be applied to a damp surface. Too dry and it won’t hydrate properly, likewise too wet doesn’t work either. |
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