I just pulled that video because it was a top result from a main brand that showed how to make the cap, as I remember it. Windows may or may not have built-in J channels. are they all doing it wrong based on tradition? Just for visual aesthetics? If they put J-channel on 4 sides around a window. And there are companies that specialize in re-siding, gutters, etc. The manufacturers have instructions for these things. Not all areas have the same humidity levels, receive the same amount of wind driven rain, roof overhangs vary. And perhaps is a newer installation development. Underflashing in that fashion may be a good idea. Not relying on the caulk but i think it will minimize how much water gets behind it. I installed mine with j channel where I used a drip cap, locked the channels with rivet and sealed the top joint with osi quad caulk. Example, what kind of sill? Is it a channel or slope sill like regular window? Lot to assume here without better description, photo even better, of your window. But not sure since it's changing a lot with vinyl windows. I'm thinking of drilling drainage holes on the bottom of the next course up.īTW, assuming built in channel means with built in trim also. Image shows flash that is inserted into the lock channel but I put my tarpaper over it, cut flush. I'm still thinking about how water drains in that area. BTW I under flashed with tarpaper, does not have to be sheetmetal. Maybe with built in channel, amount of water is more? I don't know but maybe that under flashing should be wider to cover more area and flashing tape should go over the under flashing again. Windows are flashed with tape first but with image above, water in the channel should be flowing over the siding, in theory anyway.
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