How much does clapboard contribute to rigidity? I've contemplated stripping the exterior of my house someday, so that new insulation and tyvek could be done right. Never thought about what the clapboard adds to strength. In my case it is just clapboard on the studs, no sheathing. Do have Sheetrock on other side though, but I think most of the house has Sheetrock on studs also.
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