is the flue isulated?Having bit of an issue with our log burner lately, lots of dryish crunchy soot coming back down chimney every time liner expands with heat. It’s not really like creosote but more like cornflakes that crumble between your fingers. It just sits on top of baffle plate, it won’t burn therefore I’m leaning towards that it’s not a candidate for a fire.
Regular sweep won’t get here for nearly three weeks, any one found anything similar? We’re not burning damp wood, it’s seasoned oak been cut years ago and never let it slumber, was sweept early October, fire going every evening and mid afternoon onwards on weekends, open it out before going to bed. Glass keeps itself clean as we never shut it down too much.