I was just moving coals around inside my Oslo (installed in January, burning mostly evenings, weekends and snow days) and just noticed this chunk of what I think is cement laying in the ashes. It looks like it broke off the top corner above the firebricks.
Is this a problem? How do I fix it, if it is? Should I stop burning until it's fixed?
Is this a problem? How do I fix it, if it is? Should I stop burning until it's fixed?