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Water appears in the attic only during heavy rain
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I’m trying to distinguish a roof intrusion from a plumbing or HVAC-related source before dispatching the wrong trade. Water shows up in the attic during heavier rain, but the visible drip is near a plumbing vent and an HVAC line, so the location alone isn’t conclusive.
What observations are most useful for narrowing this down without walking on a wet roof? I’m noting whether the dripping increases with rainfall intensity and whether it changes when nearby plumbing is used. I’m also documenting the ceiling stain, wet insulation, and the area around the pipe and roof penetrations, including their positions relative to the valley and bathrooms.
Would a roofer or plumber find any particular photos or timing notes especially helpful? For now, I’m focused on containing the interior water and avoiding a roof walkaround until conditions are dry and safe.
1 reply
The drip’s position beside the plumbing vent or HVAC line can be a red herring. In the attic, water may run along the roof deck, a rafter, or a seam before it finally drops, so check whether the damp area extends uphill from the visible drip.
Without touching the wet roof, photograph the attic path and note the highest wet point you can identify. A simple sketch showing the drip, that uppermost damp area, the penetrations, and the valley can help the roofer trace the entry point. Keep the plumbing-use notes too, since a change tied to fixture use would point in a different direction than a leak that tracks rainfall intensity.
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