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On an episode of this old house they replaced the clapboard (which i will be doing soon) with new clapboard but behind it it looked like they had tyvek on top of tar paper over the sheathing. Did I see this right and why would you need to do that?
What is the size of wood clapboard you are replacing with ?
I didn't see that TOH segment, but are you asking why they put tyvek over tar paper?
Perhaps the tar paper was there originally, was torn, had many nail holes, so they added a new layer of tyvek.