Prosoco Fast Flash Question

I have a wall that I had to open up that had a leaky window. There was some rotten wood around the from that extended about 2-3ft from the window. Since we had to remove stone to get to it, a lot of the original house wrap was pulled with the stone. So for now it's a fairly rough open with a lot more exposed OSB on eother side of the window. Total exposed area is roughly 30-35sqft. My contractor tried using window tape and tar paper to seal it back up but water just keeps finding a way to the window below it. We've opened and closed the wall 3x now and just can't figure it out. The inside is open so we know the window itself isn't the culprit. Right now it's just tape on the wall but as mentioned, water is somehow getting around it and into the bottom window now. The image attached was after the first pass and that has since been removed and the area opened slightly more. I was thinking of ripping out the tape and tar paper and using Prosoco joint/seam followed by fast flash on the exposed area and window flanges. We'll have to put some tar paper back up for lath and scratch coat in prep for stone. I should be able to scoot that tar paper underneath the top paper for shingling, then drape some over the bottom area to continue the shingling down below. I'd probably try to go overkill on Prosoco fast flash and apply it under each seam and over each seam and wet set some areas (ex window flange and where we drape over the paper on the bottom where possible. Is this a good option? Can I Am I overthinking it? Can fast flash even be used like this? Cat5 is just too expensive for such a small area. submitted by /u/trentonite [link] [comments]

May 1, 2025 - 07:28

I have a wall that I had to open up that had a leaky window. There was some rotten wood around the from that extended about 2-3ft from the window. Since we had to remove stone to get to it, a lot of the original house wrap was pulled with the stone. So for now it's a fairly rough open with a lot more exposed OSB on eother side of the window. Total exposed area is roughly 30-35sqft.

My contractor tried using window tape and tar paper to seal it back up but water just keeps finding a way to the window below it. We've opened and closed the wall 3x now and just can't figure it out. The inside is open so we know the window itself isn't the culprit. Right now it's just tape on the wall but as mentioned, water is somehow getting around it and into the bottom window now. The image attached was after the first pass and that has since been removed and the area opened slightly more.

I was thinking of ripping out the tape and tar paper and using Prosoco joint/seam followed by fast flash on the exposed area and window flanges. We'll have to put some tar paper back up for lath and scratch coat in prep for stone. I should be able to scoot that tar paper underneath the top paper for shingling, then drape some over the bottom area to continue the shingling down below. I'd probably try to go overkill on Prosoco fast flash and apply it under each seam and over each seam and wet set some areas (ex window flange and where we drape over the paper on the bottom where possible. Is this a good option? Can I Am I overthinking it? Can fast flash even be used like this? Cat5 is just too expensive for such a small area.

submitted by /u/trentonite
[link] [comments]