Water stains were noted at a wood ceiling, immediately adjacent a skylight, at a recent home inspection in Roche Harbor on San Juan Island. Probed with a moisture meter, the underlying ceiling cavity was dry at the time of inspection, but there obviously was water intrusion at some point in time. The skylight flashing detail appeared to be in excellent condition, suggesting the water intrusion could have been from wind-driven rain, or that it predated the skylight installation when the roof was replaced a decade ago. In any event, I recommended the client monitor for recurrence into the future and repair if noted. It’s important to monitor all roof penetrations (e.g., skylights, stove flues, vent pipes, solar tubes, etc.) for water intrusion and repair immediately when/if noted.
Water intrusion and damage were noted at OSB structural wall sheathing in the crawl space at a recent home inspection on Orcas Island in the San Juan Islands. I like to say “Water is the enemy” to my clients, because much of what I report as a home inspector in the Pacific Northwest has to do with water damage. Water can lead to structural damage, settling, mold, and insect activity/damage (e.g., carpenter ants, anobiid beetles, termites, moisture ants, rot fungus, etc.). So, if you see water intrusion, deal with it sooner than later because repairs become much more expensive with time.