A California school district must replace roofs on three high schools because they were built without outlets for runoff water. The projects are expected to cost $14 million -- unless solar panels are also installed. In that case, the repairs would be only about $4 million, although the cost of the panels would raise the overall price. The roofs are structurally sound, but the lack of runoff outlets will lead to pooling water, which will shorten the lifespan of the roofs.
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