Magnificent Metal Monday – Bézier Curve + Zinc = Winning Roof

Photo: Greg Van Riel / Metal Architecture

Another winner in METALCON’s inaugural Metal in Architecture Design photo contest for the “Roofing” category was awarded to Rheinzink for their Bézier Curve House/A-House located in North York, Ontario, Canada.

In a feature article in Metal Architecture, Paul Deffenbaugh, editorial director, writes, “Mathematicians often speak of the beauty of a math equation, but when you see this formula (Bézier curve = B(t) = (1- t)[(1- t)P0 + tP1] + t[(1- t)P0 + tP2) put into practice in the roofline of a custom home in North York, Ontario, Canada, the beauty comes to life. Then clad that roof in zinc shingles that impose a texture and formality on the structure, and the beauty becomes elegant. And introduce weather, and the roof becomes a kinetic sculpture that forms snow into cones connecting the eaves to the ground.”

The A-House, North York, Ontario, Canada

Farhad Kazmian, a custom home building with ABOND Homes, worked with Toronto- based architect Tania Bortolotto to redesign his personal residence in an established neighborhood that fulfilled his desire for a contemporary design. Instead of a traditional flat roof, Kazmian wanted a roof resilient to the climate and was insistent on using zinc versus traditional slate.

According to the article, the task of cutting each rafter individually placed fell to lpro Sheet Metal Ltd., Angus, Ontario, and fabricating architectural-grade zinc from RHEINZINK America Inc., Woburn, Mass., into 20,000 roof tiles. “There were probably eight different sizes,” says Alex Prothmann, Alpro president and CEO, “and about four different lengths as well as combinations of all those. We actually did a layout grid system like throwing a fishing net over the entire surface of the roof. That guided our installation and told us what sizes to use.” From flat to finish, the company was able to do about 200 tiles a day. Prothmann also custom-fabricated the snow stops, which were inspired by European designs. In addition to the zinc roof tiles, a custom-fabricated standing seam roof made from stainless steel was installed on the side and back of the home.

Photo: Greg Van Riel / Metal Architecture

A panel of judges comprised of the Metal Construction Association (MCA) council chairs and other metal construction and design industry experts determined one winner in each of the four categories with one grand-prize winner. Entries were judged based on the use of metal in design and construction communicated through photographs, not photo composition. Top entries were displayed in the METALCON Metal in Architecture Gallery at the Tampa Convention Center last month during METALCON 2021.

Additionally, this project was recognized in July as one of the 2021 Metal Architecture Design Award winners for its roofing design.

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