Failed caulking details and huge vulnerable seams between siding abutments at the exterior of a home in Friday Harbor in the San Juan Islands were discovered at a recent home inspection. It’s very important to protect open seams at the building’s exterior from water intrusion which can, and will, lead to water/insect damage in short time. Caulking abutments is advised, or installing a metal flashing detail behind open seams does the trick too.