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Message: [QUOTE="Mucky_Waters, post: 372034, member: 3859"] Perhaps you could contact her on that koi forum you follow her on and ask her if she sees or has noticed much condensation, and let her know there could certainly be an issue going on behind those cedar boards, if not now then in the future. Wherever you have high humidity in the air and colder surfaces (like exterior walls, windows, and doors) you will get condensation. Without some sort of vapor barrier, the moist air in her pump room will pass through the siding and permeate and condense on the cooler insulation and outside wall. And eventually grow mold or even rot if it is real bad. I have wrung the water out of soaking wet fiberglass insulation in walls before, and that was a wall that had a vapor barrier, it just wasn't sealed properly around an electrical outlet on the inside wall. It can actually be worse if you heat the warm air inside, warmed air expands and wants to rise, it tries to get out harder than cooler air any way it can and it can find all sorts of channels through insulation and plywood framing. Perhaps she does have a vapor barrier, I just can't see it.? But just in case. :( [IMG]https://www.familyhandyman.com/wp-content/uploads/2017/12/FH02JAU_02333_004.jpg[/IMG] [/QUOTE]