![]() ![]() Fiberglass is shoved between the rafters. Those get large enough and, PLOP!, it starts raining in your house!Īll too often, a T&G ceiling is constructed in a way that virtually guarantees water problems. If this happens enough, the water builds up and forms large drop of water. ![]() Under the right conditions, when water vapor in the air comes in contact with a surface cooler than the air, the water vapor becomes liquid water. This is exactly what’s happening inside your ceiling. There’s no ‘leak’ but yet the lid is covered with water due to condensation forming on it. What do you see? Lots of water on the underside of the lid. Why do ceilings drip when there’s no leak?īoil a pot of water with a lid on it. If they’re unlucky, they spent thousands of dollars, added ventilation, and the water problems became worse! If they took it a step further, someone pulled off some of the ceiling planks, saw the real problem (condensation) and told them that they need to ventilate the ceilings. The caller/writer then tells me that the roofer came out to check for leaks and couldn’t find anything. I’ve probably heard this a hundred times – “Help! Water is leaking from my ceiling! We had a cold snap and now it’s a beautiful day and now it’s raining in my house!” Unfortunately, T&G ceilings have become the single most discussed items on Ted’s Energy Tips due to their overwhelming tendency to be associated with water, mold, or moisture problems. (Photo shows a thermal scan of a ceiling where cold air is leaking in through the gaps – those are the black streaks down the photo) Tongue and groove ceilings – they’re beautiful, but like many beautiful things, they can be problematic.
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