The inquest, sitting at Harrogate Magistrates' Court yesterday, was told there were problems fitting the plastic lining in the chimney and Mr Jamieson was one of several steeplejacks working on the job.
As the plastic lining was shunted up the chimney it kept getting stuck.
The inquest heard Mr Jamieson may have heard project manager Colin Nodder make a comment on the problem and possible solutions.
One possible solution was to lever the plastic lining into place from level 15 of the chimney.
The inquest was told Mr Jamieson was never given any instructions telling him to go to level 15 and any attempt to move the plastic lining on his own would have been futile.
His body was later discovered on level 13 of the 20 floor chimney. He probably fell from level 15, the inquest was told.
Coroner Geoff Fell said although Mr Jamieson was very experienced and safety conscious "it appears on this occasion he went to level 15 and beyond the safety barriers and without a safety harness".
