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Researching the Fortress of Louisbourg National Historic Site of Canada
  Recherche sur la Forteresse-de-Louisbourg Lieu historique national du Canada

DOMESTIC BUILDING CONSTRUCTION 
AT THE FORTRESS OF LOUISBOURG, 1713 - 1758

By

Eric Krause

1996 Draft Report

(Fortress of Louisbourg
Report Number H G 10)

CHAPTER TWENTY-ONE

CHIMNEYS AND CHIMNEY OPENINGS - FLUES

Builders preferred a separate flue for each fireplace. The withes between the flues of the back-to-back fireplaces in the proposed Rodrigue house on Block 2 were to be the thickness of one brick. The mason was to surface both the flues and the withes with a lime and sand enduit rendering.

Such flues were not excessively large at Louisbourg. The cantered flues at the Royal Battery, for example, were 2 1/2 pieds long by 8 pouces wide with one pouce thick brick withes. In the engineer's house, several 12 pieds high chimneys, for back-to-back fireplaces, had brick flues 2 pieds 6 pouces wide by one pied 3 pouces deep. Elsewhere, in the office of the magasin des vivres, a brick chimney, 17 pieds 6 pouces in height, servicing a single fireplace, measured 3 pieds 2 pouces wide by one pied 6 pouces deep.