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I would add that although clay tiles are very durable, at least in Germany they don't typically last 250 years.<br>
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I doubt that they would last one winter here in Kanata.</blockquote><div><br></div><div>along the upper reaches of 16th Street (which leads to the White House, 5 or so miles to the south) there are a number of houses built in the early 20th century capped with terra cotta or other clay tiles (colors range from flower pot to lichen green). Not to compare the Washington, DC climate with Ontario, it's not uncommon (or at least in the recent past) for temps to drop below 10d F at night during winter. I'd eyeball the typical roof pitch of these homes at >9:12.</div>
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