Question about the Mansfield stove.I had my stove and flue cleaned the other day.When the guy was cleaning the stove he removed the stove pipe, as you are looking down to the stove through the stove collar he pulled the insulation back to clean.Their is a gap of about a 1/2" that runs across the top of stove that is filled in with what looks like stove cement.Well it was cracked and broken up into small pieces that pulled out very easily.He replaced it with fiberglass rope by pushing it into the crack (I assume the fiberglass was the type that you use for the door gaskets).I did have more of a cresote build up than I had expected.He said the build up might have been caused by the furnace cement not giving the stove a seal.I am pretty sure the wood I burned wasn't the culprit as it was very dry wood.Was he correct in doing this?The stove is only about a year old.