ASTM C 1283 Standard Practice for Installing Clay Flue Lining, Section 5.5...
Flue liners shall be surrounded by masonry on all sides but shall not be bonded to the surrounding masonry. The flue liner shall contact the chimney wall only as necessary for support and alignment in order to permit the flue liner to expand and contract freely. The separation of the flue liner from the surrounding concrete or masonry shall not exceed the wall thickness of the flue liner. Where Seismic Reinforcing requires the space between the flue liner and the chimney wall to be grouted solid the flue shall be wrapped with ceramic fiber paper capable of withstanding temperatures of 2100 deg. F to prevent the flue liner from bonding to the chimney walls. (Bold type added to highlight.)
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Buckley Rumford Fireplaces
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