I found the BACK side of one of my siding boards to be wet. It was a horizontal 1×8 cedar piece and the one above it was not wet.
The piece is on the side of a large dormer, and was near the roof (that is, it was a short 4 foot piece with one end butted up to the dormer corner board, and the other end is cut at an angle and comes within 1 inch of the roof shingles.
Most siding on my house is away from the “splash” effect of rain. Usually by being 2 feet above the ground. But these dormer side pieces , where they intersect the roof seem to me to be in the splash zone of rain hitting the roof and splashing up from the bottom side onto the horizontal siding joint.
What stops the splash problem here?/
Should these horizontal joints be caulked?
nailed together tighter?