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Custom Sheet Metal Projects
The work here was done by Doug Tweet, the owner and founder of On-Top Industries Ltd.
 The Rotunda is a copper sheet metal installation that was run through a Pitsburg machine to build the perfect rounds and then joined with standing seams. The patina was achieved using a spray on acid wash to artificially age the copper to a green/blue hue |  The wood structure for the table was overlaid with a malleable Reinzink metal using hand rollers to stretch it and hidden fasteners in the standing seams. |  |
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 This house on 15A street in Marda Loop Calgary was designed by the architect to have a front entrance overlaid with 16 OZ Copper including the roof overhang in standing seams with copper on the fascia as well as the columns. |  Copper fasteners were used and carefully hemned edges provide a clean look. The clips allow for proper expansion and contraction to avoid oil canning. The natural aging of the copper will turn a green hue over time. |  These two custom home estates showcase the copper barrel vault roofing, which is achieved by curving the panels by machine or by hand over the barrel with standing seams. |
 The copper can be left to weather naturally or treated with an acid etch to achieve a greening blue patina as desired. |  |
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