Leak Appearing on Ceiling – Deck Built Directly Above

Do you have a room in your home that has a deck built directly above it?

Any signs of leaks on the ceiling or wall below the deck?

Today I did a leak detection on a home that had an interesting outcome. The home owner noticed a drip coming through the tounge and groove on a rimu ceiling. His immediate reaction was to suspect the leak was penetrating from around the decking above. The frustrating part was that he had the deck completely resealed just one year ago.

Using thermal imaging and a moisture meter, I was able to pinpoint the leak source… it turned out to be tracking from behind a wall in a storage cupboard on the second floor. There was a gutter downpipe that was built in behind the cedar cladding in one section, and as you would expect, the source of the leak was hidden in behind there. Using my non-invasive leak detection equipment I picked up the leak on the interior gib board that backed directly onto the drain pipe. The wall looked completely clean without any visual sign of moisture, so there was really no chance of finding it without thermal imaging unless the gib was pulled off… and that would still have been a guess.

After getting that far, we pulled out the measuring tape and took some measurements from the nearest exterior walls to see if the leak source would correspond to the area below where the leak was visually dripping from between the rimu boards. Our measurements were bang on target… so that was that leak issue solved!

This detection was another classic example of a leak coming from somewhere totally different then first thought.

Call us for a free over the phone quote on any moisture or leak issues you may have in your home!


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