Where to caulk wood siding?
I live in a 1920 wood sided house in Climate Zone 4. We’re in the process of removing the vinyl siding and painting the old clapboards. The old siding is in surprisingly good shape and so far needs little repair/prep prior to painting. I’ve started to caulk the vertical joints around windows, doors, corner trim, etc. but I question caulking the horizontal joint under each clapboard. I had not planned to do so but I’ve have more than one person suggest caulking it and say they’ve done it or have seen in done on numerous occasions with no problems.
In our situation, the siding is nailed directly to the studs (no sheathing) and behind the siding is either blown in cellulose or spray foam as both have been installed in the house at different times. The logic as explained to me was the caulking would keep the wall insulation dry and basically provide a weather resistant barrier at the outside wall plane (we do have leaky walls).
Any thoughts on the pros and cons of caulking the clapboards? Thank you.
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