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We always treated the two layers as separate waterproofing systems. Drip edge, if any (if none, leave felts out an inch or so for a crude one, or make one from asphalt shingles) double layer of 3 foot felt, then 3 foot felt overlapped 19" (so there is always a double layer - tripled for an inch at the ends of overlaps) - there should be a guideline for ...


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A third possible (but unlikely) source of the water in your attic: There's no cap on the roof vent in your picture. So any rain that hits the open end will run down inside the vent line to the drain. In the process it could collect in any horizontal runs that aren't sloped correctly. Add sloppy glue on joints "that only carry gases" and you've got a time ...


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I went up onto the roof and looked at the vents. The rubber around the pipe was cracked with large gaps on both. I added outdoor rated caulking to reseal them. Edit - We had a good rain yesterday (3in + with periods of heavy downpour as well as gentle soaking). I had placed some plastic sheeting under the vent in the attic above the bathroom. The ...



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