I use to help frame houses and once you nail the boards into place they resist warping well in the rain for a while. I threw away so many boards that were left out when someone didn’t cover the boards back up with a tarp when leaving on a Friday. Also normally the day after it rains you spend a lot of time cleaning up water. Normally you can push broom rainwater off somewhere, but sometimes you may even need a squeegee. Also the wind will blow stuff over a lot. Once the roof is on water will mostly be diverted from going anywhere important. They wrap the houses in plastic and shingle the roofs to give time for everything else. Then they come back later and put decorative stuff like brick, rock, stucko, siding etc.
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