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Slate: These roofs are produced from slate rocks. The length, pitches, and heights http://idioms.thefreedictionary.com/roof of the two roofs may or might not change from each other. Over 100 years ago, engineers would http://roof-help.net/ calculate the amount of stress and build these roofs intuitively, but at that point of time, these designs were a costly affair that was not simple for residential or commercial constructions being built around the budget.