Once the two halves of the house are safely bolted in place on the foundation, the same crane helps unfold the roof, which rises segment by segment from its bed atop the house halves and is nailed in place by a professional crew as it goes. Most of the shingles are already in place, and the prebuilt gable-end framing is installed last. This way, a roof that would otherwise have taken days to build piecemeal is in place and weathertight in just a few hours.
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